Montana Fossil Sites

Location County State/Province Directions,Notes Age Formation Fossils Comments Reference Lat-Long
Eastern Montana-Western South Dakota – MT In Hell Creek Formation – dark colored continental beds above the Fox Hills Sandstone and Pierre Shale. Cretaceous Hell Creek Vertebrate fossils are not uncommon but are not mineralized and do not weather well. Sharks-Lonchiodon; Rays-Myledaphus; fish-Acipenser,Paleopsephurus,Amia,Lepisosteus,Platacodon,Palaeolabrus; Amphibians ; Caudata,Scapherpeton,Prodesmodon,Opis MT0001
Arrowhead Mountain Beaverhead MT In Centennial Range on N face E of mouth of Odell Creek S29t14sr1w-s32t14sr1w Mississippian Lodgepole Lithostrotionella,Syringopora,gastropods MT0002
Diamond O Ranch Beaverhead MT Eocene-Oligocene Renova Mammal Fossils MT0003
Dillon Beaverhead MT 25 km NE on MT41 at Point of Rocks Fossils and Dinosaur Bone MT0004
Dillon Beaverhead MT 30 km W in Frying Pan Basin Petrified Wood MT0005
Dillon Beaverhead MT along Blacktail Creek road on NE side of Blacktail Creek in S23t12sr6w-t26 t12sr6w Triassic Lower Dinwoody Limestone Lingula,ammonites. brachiopods,pelecypods MT0006
Little Sheep Creek Beaverhead MT on Middle Fork on E side in SE s29t15sr8w Jurassic Ellis Gryphaea,Camptonectes,Pinna,Trigonia,many Pentacrinus MT0007
Sheep Creek Canyon Beaverhead MT W side in Blacktail Range s7t9sr8w Mississippian Amsden Limestone brachiopods,corals,Linoproductus,Composita,Lingula,Bryozoa. MT0008
Beauvais Creek Big Horn MT On Beauvais Creek 1.6km SW of Cashen’s Ranch Crow Indian Reservation Cretaceous Cloverly vertebrates-Sauropelta MT0009 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Beauvais Creek Big Horn MT On Beauvais Creek 1.6km W of Cashen’s Ranch Crow Indian Reservation Cretaceous Cloverly vertebrates-Deinonychus MT0010 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Beauvais Creek Big Horn MT On Beauvais Creek 28.8km SW of Crow Agency Cretaceous Cloverly dinosaur bones MT0011
Beauvais Creek Big Horn MT On Beauvais Creek 80km SW of Billings–may be only 74km or there may be two separate localities 16km apart Cretaceous Cloverly vertebrates-Naomichelys,Polyporites,Sauropelta,Tenontosaurus MT0012 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Beauvais Creek Big Horn MT On E fork Beauvais Creek 16km SW of Cashen’s Ranch Crow Indian Reservation Cretaceous Cloverly vertebrates-Sauropelta,Tenontosaurus MT0013 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Beauvais Creek Big Horn MT On W fork Beauvais Creek 62km SE of Billings Cretaceous Cloverly turtles-Helopanoplia MT0014
Billings Big Horn MT S near Wyoming border between Pryor and Bighorn Mountains silicified coral. MT0015
Buster Creek Big Horn MT Cretaceous Cloverly turtles-Naomichelys MT0016
Buster Creek Big Horn MT Cretaceous Sykes Mountain vertebrates-Champsosaurus MT0017 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Christine Big Horn MT 3.2km E Cretaceous Judith River Reptiles-Champsosaurus;Turtles MT0018
Hardin Big Horn MT Pennsylvanian[?] Sage Hen Limestone pelecypods,ammonites,Inoceramus,Scaphites. MT0019 Source says Pennsylvanian,but the assemblage looks Cretaceous
Horse Coulee Big Horn MT 1.6km N of Cashen’s Ranch Cretaceous Cloverly crocodile bones MT0020
Mott Creek Big Horn MT 14.4km E of Cashen’s Ranch on Crow Indian Reservation Cretaceous Cloverly Crocodiles;Dinosaurs-Deinonychus MT0021
Mott Creek Big Horn MT 14.4km E of Cashen’s Ranch on Crow Indian Reservation (Coordinates for Mott Creek 45.47,-108.11 Cretaceous Cloverly Dinosaurs-Sauropelta[?],Tenontosaurus MT0022 Original says Sauropeltis
Pryor Big Horn MT 12.8km E at Hams Creek Cretaceous Fort Benton vertebrates-turtles- MT0023 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Pryor Big Horn MT 16km E at Brush Creek Cretaceous Fort Benton vertebrates-turtles-Glyptops MT0024 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Pryor Big Horn MT 40km E Cretaceous Fort Benton vertebrates-turtles-Naomichelys MT0025 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Pryor Big Horn MT 40km SE of Pryor in area exposures around Cashen’s Ranch Cretaceous Cloverly vertebrates-Sauropelta,Tenontosaurus;Crocodile-Goniopholis?;turtles-Naomichelys MT0026 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Pryor Big Horn MT 8km NE Cretaceous Cloverly vertebrates-Sauropelta,Tenontosaurus MT0027 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Pryor Big Horn MT Area Exposures-12.8kmE,18kmE,19.5kmSE,40kmE,48kmE Cretaceous Fort Benton vertebrates-turtles-Glyptops;fish teeth-Cladodus,Orodus;reptiles-plesiosaurs,crocodiles-Teleorhinus MT0028 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Pryor-Horse Coulee Big Horn MT 48 km E of Pryor at Horse Coulee Jurassic Morrison dinosaur bones-Diplodocus MT0029
– Blaine MT Cretaceous Bearpaw Shale Cephalopods Placenticeras MT0032
– Blaine MT Cretaceous Judith River sharks – Hybodus,Cretorectolobus,Synechodus,Ptychotrygon Fish mouth plates – Parabula Judith River Fm – general dinosaurs Monoclonius MT0033
Suction Creek Blaine MT Cretaceous Judith River shark teeth-Hybodus,Lonchidion MT0030
Timber Ridge Blaine MT Cretaceous Judith River fish teeth-Parabula MT0031
– Blaine,Fergus MT Cretaceous Judith River Vertebrates-Crocodiles-Leidyosuchus;Dinosaurs-Monoclonius;turtles-Naomichelys MT0034 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Bearpaw Mountains Blaine? MT to S,N of Missouri River Cretaceous Judith River Upper fish teeth-Archaeotriakis,Cretorectolobus,Hybodus,Hypotodus,Ischyrhiza,Myledaphus,Odontapsis,Plicatolamna,Protoplatyrhina,Ptychotrygon,Squalicorax,Synechodus MT0035
Bear Creek Carbon MT Paleocene Upper Fort Union Mammal Fossils MT0036
Bridger Carbon MT Gastropods – Planorbis MT0037
Bridger Carbon MT 17.6km E Cretaceous Cloverly vertebrates-Sauropelta,Tenontosaurus MT0038 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Bridger Carbon MT 20 km S in area exposures Reptile fossils. MT0039
Bridger Carbon MT N E of US310 Reptile Fossils MT0040
Caslieus[?] Carbon MT 5.6km NE on Point Creek Cretaceous Cloverly Dinosaurs-Tenontosaurus MT0041 Unable to locate a ‘Caslieus’ or anything similar in Big Horn County (or,indeed,anywhere)
Red Lodge Carbon MT to S and E in area exposures Eocene Fort Union Plant and animal fossils MT0042
Chalk Bluff Carter MT dinosaurs – Triceratops MT0043
Powder River Carter MT in breaks of Powder River about 130m below Fort Union coal Cretaceous Lance dinosaur teeth MT0044
Great Falls Cascade MT 11.2km E On Missouri River just below Rainbow Falls Cretaceous Kootenai Dinosaur bones MT0045
Vaughn Cascade MT 18 km W of Great Falls black petrified wood,teredo wood. MT0046
Chouteau Chouteau MT Cretaceous Two Medicine Dinosaur egg shells MT0047
Chouteau Chouteau MT Cretaceous Two Medicine Hadrosaurs – Maiasaura MT0048
Chouteau Chouteau MT In Willow Creek Anticline Hadrosaur bones,eggs,nests Orodromeus,Troodon,Maisaura – owned and by Nature Conservancy and Museum of the Rockies.{7} MT0049
Clambank Hollow Chouteau MT Cretaceous Judith River Mammal Reference Location MT0050
Clambank Hollow Chouteau MT SE1/4S31T24NR17E Cretaceous Judith River Mammals-Allotheria,Allotheria,Alphadon,Boreodon,Cimexomys,Cimolodon,Gypsonictops,Meniscoessus,Mesodma,Pediomys,Theria;Dinosaurs-Albertosaurus,Corythosaurus,Dromaeosaurus,Edmontonia,Kritosaurus,Palaeoscincus,Paronychodon,Procheneosaurus,Stegoceras… MT0051
Loma Chouteau MT area roadcuts Baculites MT0052
Marias River Valley Chouteau MT In ‘breaks’ marine fossils in concretions MT0053
– Custer MT Cretaceous Pierre Ostrea,Avicula,Inoceramus,Chlamys,Yoldia,Nucula,Lucina,Protocardia,Callista,Lunatia,Scaphites,Nautilus,Modiola,Veniella,Anchura,Haminea,Pyrofusus,Dentalium,Baculites MT0055
– Custer MT SE part of County Cretaceous Pierre ? MT0056
Mexican Hat Custer MT In Williston Basin at NE1/41NE1/4S29T8NR52E Paleocene Fort Union About 20 taxa of plants-Sycamore,etc MT0054
Crooked Creek Dawson MT 208km NW of Miles City,40km S of Glasgow Cretaceous Hell Creek dinosaurs-Anatosaurus,Anatotitan,Ectoconodon,Myledaphus,Triceratops,Tyrannosaurus;crocodiles-Leidyosuchus;turtles-Asperidites MT0057
Glasgow Dawson MT 64km S Cretaceous Lance vertebrates-Hybodus MT0058
Glendive Dawson MT Cretaceous Hell Creek dinosaurs;turtles-Stygiochelys MT0059
Glendive Dawson MT Cretaceous Hell Creek dinosaurs;turtles-Stygiochelys MT0060
Glendive Dawson MT Cretaceous Lance marine shells,dinosaur bones – Triceratops,Trachodon,Tyrannosaurus,Camptosaurus,crocodiles,turtles,mammals MT0061
Glendive Dawson MT Cretaceous Pierre Shale Mollusks – Inoceramus,Cephalopods: Acanthoscaphites,Plants Gingko MT0062
Glendive Dawson MT 10.5 km W on extension of 10th Avenue – 1.5 km E of creek crossing Cretaceous Pierre abundant fossils MT0063
Glendive Dawson MT 16 km SW near Iron Bluff Cretaceous Lance abundant marine shells,reptile bones -Triceratops,Trachodon,Tyrannosaurus,Camptosaurus,crocodiles turtles,mammal teeth MT0064
Glendive Dawson MT At Makoshka State Park Cretaceous Hell Creek vertebrates-reptiles-Champsosaurus;turtles-Adocus,Asperidites,Baena,Clemmys,Compsemys;Dinosaurs-Triceratops MT0065 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Glendive Dawson MT NW along Hell Creek in Sandstone Cretaceous Fox Hills Carbium,Nucula,Tellina,Yoldia,Crenella,Piestochilus,Anchura,Lunatia,Cylichna,Baculites,Scaphites,Chemnitzia,Mactra,Actaeon MT0066
Glendive Dawson MT along Cedar Creek in concretions ammonites,Baculites MT0067
Glendive Dawson MT from 24 to 240 km downstream to vicinity of Forsythe S.D. Cretaceous Lance abundant marine shells,reptile bones – Triceratops,Trachodon,Tyrannosaurus,Camptosaurus,crocodiles turtles,mammal teeth MT0068
Hell Creek Dawson MT Cretaceous Pierre Ostrea,Avicula,Inoceramus,Chlamys,Yoldia,Nucula,Lucina,Protocardia,Callista,Lunatia,Scaphites,Nautilus,Modiola,Veniella,Anchura,Haminea,Pyrofusus(a whelk),Dentalium,Baculites MT0069
Hell Creek Dawson MT above Pierre shale Cretaceous Fox Hills Carbium,Nucula,Tellina,Yoldia,Crenella,Piestochilus,Anchura,Lunatia,Cylichna,Baculites,Scaphites,Chemnitzia,Mactra,Actaeon MT0070
Jordan Dawson MT 56km E Cretaceous Hell Creek turtles-Asperidites MT0071
Missouri River Dawson MT along River and tributaries Cretaceous Pierre Ostrea,Avicula,Inoceramus,Chlamys,Yoldia,Nucula,Lucina,Protocardia,Callista,Lunatia,Scaphites,Nautilus,Modiola,Veniella,Anchura,Haminea,Pyrofusus,Dentalium,Baculites MT0072
Baker Fallon MT 11.2km S Cretaceous Hell Creek vertebrates-reptiles-Leidyosuchus MT0073 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
– Fergus MT area exposures Cretaceous Upper crocodile – Deinosuchus to 12 meters MT0086
Armells Creek Fergus MT Cretaceous Pierre Plesiosaur-Elasmosaurus MT0074
Bear Gulch Fergus MT Important locality-Goelex says names locality of the Bear Gulch Limestone is in T14NR21-22E Pennsylvanian Bear Gulch Diverse faunas–Invertebrates,fish MT0075 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Big Snowy Mountains Fergus MT on N flank in s6t12nr20e Carboniferous Amsden Limestone brachiopods (some oil filled),Leiorhynchus,Productus,Chonetes,Composita,Pustula,Trepospira all in concretions MT0076 The Heath Formation is Oligocene. The Amsden and Otter are in fact Mississippian
Dog Creek Fergus MT Cretaceous Clagett bird bones-Hesperornis MT0077
Dog Creek Fergus MT On divide between Dog Creek and Judith River drainages Cretaceous Judith River vertebrates-Crocodiles-Leidyosuchus;turtles MT0078 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Heath Fergus MT 10 km ESE in 20cm layer crustacea,abundant fish,ostracods,brachiopods MT0079
Heath Fergus MT in Mississippian Upper Heath shale 10 km ESE in a black fissile shale bed about 20cm thick. Mississippian Upper Heath Crustacea,fish,Conchostraca,ostracods,brachiopods. MT0080
Hilger Fergus MT N of Lewistown at Van Haur Farm Cretaceous Clagett reptile bones MT0081 Original says ‘Hilgur’
Judith River Fergus MT Cretaceous Judith River dinosaurs-Deinodon MT0082
Missouri River Fergus MT Opposite mouth of Dog Creek Cretaceous Judith River dinosaurs-Monoclonius MT0083
Willow Creek Fergus MT Deinosuchus (a crocodile),the type of Deinosuchus was found at Willow Creek,4.8km W of Nolan and Archer’s Ranch,In Fergus County,Montana. From the Judith River Formation Cretaceous Judith River Crocodile – Deinosuchus MT0084
Winifred Fergus MT NW in badlands along Missouri River Cretaceous Judith River vertebrate fragments MT0085
Lewiston Flathead MT West Mississippian Bear Gulch Limestone Worms MT0087
Anceney Gallatin MT Miocene-Pliocene Madison Valley Mammal Fossils MT0088
Logan Gallatin MT Mississippian Madison crinoid fragments,Ambocoelia,Camarotoechia,Cleiothyridina,Cyrtospirifer MT0089
Logan Gallatin MT 16 km E at Iron Bluff Mississippian Madison crinoid fragments,Ambocoelia,Camarotoechia,Cleiothyridina,Cyrtospirifer MT0090
Logan Gallatin MT In s24t2nr2e Devonian Three Forks Syringothyris,Cyrtospirifer. Cladopora,Stromatoporoids MT0091
Logan Gallatin MT on N bank of Gallatin River across from town in se1/4s25t2nr2e Mississippian Madison crinoid fragments,Ambocoelia,Camarotoechia,Cleiothyridina,Cyrtospirifer MT0092
Three Forks Gallatin MT S of town Petrified wood MT0093
Three Forks Quad Gallatin MT Trilobites Bathyuriscus MT0094
Three Forks Quad Gallatin MT brachiopods Micromitra MT0095
Brownie Butte Garfield MT Cretaceous Hell Creek Abundant and diverse fossil plants MT0096
Gilbert Creek Garfield MT Multiple exposures–208-224km NW of Miles City Cretaceous Hell Creek crocodiles-Leidyosuchus;dinosaurs-Ankylosaurus,Tenontosaurus,Thescelosaurus,Triceratops,others MT0097 This is possibly the Gilbert Creek in Garfield County,but there are other Gilbert Creeks in MT
Hell Creek Garfield MT Area exposures 25.6km N of Jordan,200-208km NW of Miles City. There may be a second locality 40km N of Jordan Cretaceous Hell Creek crocodiles-Crocodylus,Leidyosuchus;Champsosaurus;dinosaurs-Edmontosaurus,Hadrosaurus,Ornithomimus,Thescelosaurus,Trachodon,Triceratops,Tyrannosaurus;turtles-Adocus,Asperidites,Aspideretoides,Baena,Basilemys,Emys,Plastomenus;Urodela-Scapherpeton MT0098
Jordan Garfield MT 24.6km N Paleocene Tullock reptiles-Champsosaurus MT0099 Original says ‘Turlock formation
Lismas Garfield MT 36km SE at Hungry Creek-Bear Creek divide Cretaceous Hell Creek ? MT0100
Lismas Garfield MT In various locations 24,29,32,40,48 km SE on Rock Creek,Sand Creek (6km E of CK Ranch),and Sand Arroyo Cretaceous Hell Creek vertebrates-reptiles-Brachychampsa,Champsosaurus;dinosaurs-Anatosaurus,Anatotitan,Thescelosaurus,Triceratops,Tyrannosaurus;turtles-Thescelus? MT0101 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Lismas Garfield MT Two(?) sites on the E side of Big Dry Creek 44.8 and 56 km S of Lismas–possibly other area exposures Cretaceous Hell Creek leaves;vertebrates-reptiles-Brachychampsa,Champsosaurus,Leidyosuchus;dinosaur bones-Tyrannosaurus,others;turtles-Asperidites?,Baena,Clemmys,Compsemys,Eubaena,Helopanoplia,Neurankylus,Palatobaena;bird bones;fish-Myledaphus MT0102 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Lismas Garfield MT West side of Big Dry Creek 56km S of Lismas at Twitchell Ranch Cretaceous Hell Creek dinosaurs-Triceratops,Tyrannosaurus MT0103
Lismas Garfield MT West side of Big Dry Creek 79.2km S of Lismas Cretaceous Hell Creek dinosaurs-Triceratops,Tyrannosaurus MT0104 Also described as 70.4km S of Glasgow
Lismas Garfield MT area exposures-28.8km E, 36km S, 40km E, 40km S, 44.8km S, 64km S Cretaceous Hell Creek Champsosaurus;dinosaurs-Stygimoloch,Thescelosaurus,Triceratops,others MT0105
Mosby P.O. Garfield MT 1 km W off hwy18 in s11t14nr30e in shale Cretaceous Upper large ammonites – Dunveganoceras,Metoicoceras MT0106
Mosby P.O. Garfield MT 2 to 3 km E on hwy18 in s11t14nr30e in shale Cretaceous Upper Colorado poorly preserved fossils Colligoniceras MT0107
Mosby P.O. Garfield MT 500 meters E on hwy18 in s11t14nr30e in shale Cretaceous Upper Carlisle shark teeth,Colligoniceras MT0108
Mosby P.O. Garfield MT 8 km E in s3t14nr31e in shale Cretaceous Upper large ammonites – Dunveganoceras,Metoicoceras MT0109
Blacktail Creek Glacier MT Cretaceous Two Medicine dinosaur bones-Hadrosaurus MT0110
Buffalo Lake Glacier MT 4.8km W (72km W of Sweet Grass) Cretaceous St Mary River Dinosaur-Montanoceratops MT0111
Cut Bank Glacier MT 19.2km SW Cretaceous Two Medicine dinosaur bones-Hadrosaurus;Turtles MT0112
Cut Bank Glacier MT 24.6km SW Cretaceous Two Medicine dinosaur bones-Euoplocephalus MT0113
Cut Bank Glacier MT 26.2km SW Cretaceous Two Medicine dinosaur bones-Procheneosaurus MT0114
Family Mission Glacier MT On Two Medicine River 16km above Cretaceous St Mary River Dinosaur-Hadrosaurus MT0115
Family Mission Glacier MT On Two Medicine River 7.2km above Cretaceous St Mary River Dinosaur-Hadrosaurus MT0116
Family Mission Glacier MT On Two Medicine River 9.2km above Cretaceous St Mary River Dinosaur bones MT0117
Feinberg Ranch Glacier MT Cretaceous Two Medicine dinosaur bones-Bambiraptor MT0118
Manhattan Glacier MT Cambrian Upper Wolsey Glyphaspis MT0119
Milk River Glacier MT At Landslide Butte Cretaceous Two Medicine dinosaur bones MT0120
Milk River Glacier MT North Fork near Halls Ranch Cretaceous Two Medicine dinosaur teeth MT0121
Piegan Glacier MT 8km SE on Blacktail Creek Cretaceous Two Medicine dinosaur bones-Hadrosaurus;Turtles-Baena MT0122
Sweet Grass Glacier MT 48km W on South Milk River Cretaceous Two Medicine dinosaur bones-Lambeosaurus MT0123 Probably from quarry active in 1915-16
Two Medicine River Glacier MT Cretaceous Two Medicine dinosaur bones;Turtles-Basilemys MT0124
– Glacier,Flathead MT In the Western part of the Park and in adjacent Idaho Neoproterozoic Belt Group stromatolites MT0127
– Glacier,Flathead MT along Going to the Sun Highway Precambrian Belt Group Stromatolites – Collenia MT0125
– Glacier,Flathead MT along Going-To-The-Sun Highway Precambrian Algal reefs MT0126
Ryegate Golden Valley MT Marine fossils in rimrock to S ? MT0128
Philipsburg Granite MT Coral Cladopora MT0129
Bear Creek Jefferson MT Bear Creek Coal Mine 1.6km S of Bear Creek Paleocene Fort Union vertebrates-bird claws;crocodile bones,teeth;Champsosaurus;turtles-Plastomenus,others;mammals-Apatemys,Apheliscus,Carpolestes,Lampadophorus,Leipsanolestes,Paramys,Pentacodon,Planetetherium,Plesiadapis,Protentomodon,Talpavus,Thryptacodon,Viverravus MT0130 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Bull Mountain Jefferson MT on SE flank S30t2nr3w-s31t2nr3w Oligocene Lower Bozeman Tapir,Merycoidon,turtles,etc. MT0131
Jefferson River Jefferson MT In se1/4 nw1/4s22t2nr2w Devonian Three Forks Conularia,bryozoa – 4 species,crinoid columnals – 6 species,brachiopods – 21 species,pelecypods – 13 species,gastropods – 4 species,cephalopods – 8 species,arthropods — 3 species MT0132
Jefferson River Jefferson MT in Se1/4ne1/4s17t2nr3w Devonian Three Forks Conularia,bryozoa – 4 species,crinoid columnals – 6 species,brachiopods – 21 species,pelecypods – 13 species,gastropods – 4 species,cephalopods – 8 species,arthropods — 3 species MT0133
Jefferson River Jefferson MT in ne1/4 se1/4 s17 Devonian Three Forks Conularia,bryozoa – 4 species,crinoid columnals – 6 species,brachiopods – 21 species,pelecypods – 13 species,gastropods – 4 species,cephalopods – 8 species,arthropods — 3 species MT0135
Jefferson River Jefferson MT in ne1/4ne1/4s29t2nr2w Devonian Three Forks Conularia,bryozoa – 4 species,crinoid columnals – 6 species,brachiopods – 21 species,pelecypods – 13 species,gastropods – 4 species,cephalopods – 8 species,arthropods — 3 species MT0134
Little Pipestone Jefferson MT Oligocene Renova vertebrates:Pelycomys MT0136 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
McCartys Mountain Jefferson MT Oligocene Renova vertebrates:Agriochoerus,Caenopus,Oreonetes MT0137 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Miles Jefferson MT 13 km E in road cut on Hwy 12 Paleocene Fort Union leaf fossils MT0138
Miles Jefferson MT area exposures Paleocene Fort Union leaf fossils,vertebrates,mollusks MT0139 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
N Boulder Valley Jefferson MT on W side in s25t3nr3w Miocene Bozeman Cosoryx,Mesohippus,Protohippus,Camelids,Procamelus. MT0140
Pipestone Springs Jefferson MT Eocene Chadron Mammal Reference Location MT0141
Pipestone Springs Jefferson MT Oligocene Renova mammals:Adjidaumo,Apternodus,Bathygenys,Cylindrodon,Domnina,Eumys,Fricktops,Hesperocyon,Hyracodon,Ischyromys,Leptictis,Leptomeryx,Leptotragulus,Leptotragus,Megalagus,Merycoidodon,Mesohippus,Micropternodus,Palaeolagus,Paradjidaumo,Peratherium,… MT0142
Little Belt Mountains Judith Basin MT on Yogo Creek at mouth of Bear Gulch is S1t13nr10e in dolomite above shales Devonian Jefferson shark teeth,Lingula,corals,brachiopods MT0143
Gordon Mountain Lake MT In sandy beds at head of South Fork of Flathead River Cambrian Middle Brigham Quartzite Typical Middle Cambrian fossils MT0210 Walcott-Cambrian Geology and Paleontology P7
Gordon Mountain Lake MT On Gordon Creek 4km above junction with Danaher Creek in shales above sandstones Cambrian Middle? Wolsey Brachiopods-Acrothele,Wimanella;Trilobites-Albertella,Olenopsis,Ptychoparia,Bathyuriscus MT0211 Walcott-Cambrian Geology and Paleontology P22
Gordon Mountain Lake MT On ridge between Gordon and Young Creeks half way between Gordon Mountain and Cardinal Peak Cambrian Middle Wolsey Shale Brachiopod-Micromitra MT0212 Walcott-Cambrian Geology and Paleontology P56
Lake Levale Lewis and Clark MT Cambrian Pentagon Trilobites-Bathyuriscus MT0144
Slategoat Mountain Lewis and Clark MT S flank at the Head of Glenn Creek in S10t22nr112 Mississippian crinoid fragments MT0145
Alder Madison MT about 21 km away in paper shales in Ruby River Basin between Peterson and Morgan Creek Oligocene insects and plants. MT0146
Bighorn Mountains Madison MT In 500 meters thick Limestone exposure Carboniferous Madison Brachiopods,pelecypods,crinoids — Spirifer,Spiriferina,Cyrtina,Syringothyris,Reticularia,Rhynchopora,Schellwienella,Orthotetes,Schuchertella,Leptaena,Chonetes,Productus,Echinoconchus,Actita[?],Cactocrinus,Phillipsia,Straparolus MT0147 Actita=Platyceras
Black Butte Madison MT In tuffs Oligocene Titanotheres,Leptomeryx,agrichoerids(Oreodonts),Trigonias(a rhinoceros) MT0148
Cave Mountains Madison MT In 500 meters thick Limestone exposure Carboniferous Madison Brachiopods,pelecypods,crinoids — Spirifer,Spiriferina,Cyrtina,Syringothyris,Reticularia,Rhynchopora,Schellwienella,Orthotetes,Schuchertella,Leptaena,Chonetes,Productus,Echinoconchus,Actita[?],Cactocrinus,Phillipsia,Straparolus MT0149 Actita=Platyceras
Cottonwood Creek Madison MT to S in 50 meters thick sandstone bed Cretaceous Inoceramus to 15cm MT0150
Fossil Creek Madison MT N of Centennial Valley on W side of creek s4t12r2w Triassic Lower Woodside|Thaynes Columbites,Tirolites,Meekoceras MT0151
Gravelly Range Madison MT at Cave Mountain in claystone Devonian Lower Ambocoelia,Palaeoneilo,Rhipidomella MT0152
Gravelly Range Madison MT at Dry Hollow in claystone Devonian Lower Ambocoelia,Palaeoneilo,Rhipidomella MT0153
Lion Mountain Madison MT In tuffs Oligocene Titanotheres,Leptomeryx,agrichoerids,Tigonias MT0154
McCarty’s Mountain Madison MT On N side of Big Hole River Eocene Chadron Mammal Reference Location MT0155
Monument Ridge Madison MT along road to E Jurassic Ellis Ostrea,Pentacrinus MT0156
Monument Ridge Madison MT in numerous small gullies at head of Red Creek Jurassic Morrison dinosaur bones,Stegosaurus MT0157
Peterson Madison MT between Peterson and Morgan Creek in paper shales insects,plants MT0158
Raw Liver Creek Madison MT S17T8SR3E Cretaceous Livingstone Ostariostoma MT0159
Sappington Madison MT 3.5 km WSW along Antelope Creek in se1/4nw1/4s2t1r2w Mississippian Lower Sappington Sandstone Algal nodules containing silicified brachiopods,bryozoa,pelecypods,worm tubes,forams,Rhipidomella,Chonetes,Syringothyris,Spirifer,Camarotoechia,Schuchertella,Delthyris,Ambocoelia,Composita,Orbicula,Productid brachiopods,cup corals,pelecypods MT0160
Virginia City Madison MT in Ruby Mountains Oligocene Renova fossil plants MT0161
– McCone MT Olive Fauna Paleocene Fort Union vertebrates-mammals-Palaeosinopa,Thryptacodon MT0168 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Bug Creek McCone MT Bug Creek Anthills Paleocene Tullock[?] Vertebrates-Catopsalis,Cimexomys,Erinaceomorpha,Essonodon,Glasbius,Meniscoessus,Mesodma,Procerberus,Protungulatum MT0162 Original says ‘Tulock formation’. CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Bug Creek McCone MT In debris associated with anthills. Multiple localities including ‘Duen Locality’ Cretaceous Hell Creek turtles-Adocus,Compsemys,Eubaena,Palatobaena,Trionyx;reptiles-crocodiles-Brachychampsa,Leidyosuchus;Champsosaurus;birds;Squamata-Chamops,Coniophis,Leptochamops,Pancelosaurus,Parasaniwa;Urodela-Habrosaurus,Haptosphenus,Lisserpeton?,Opisthotriton,… MT0163 SW1/4S9T22NR43E
Devil’s Creek McCone MT Cretaceous Hell Creek turtles-Adocus,Compsemys MT0164
Harbicht Hill McCone MT Area exposures 1.6km N and S Cretaceous Hell Creek turtles-Asperidites,Compsemys MT0165
Harbicht Hill McCone MT S32T25NR43E Cretaceous-Paleocene Hell Creek reptiles-Tyrannosaurus,mammals-primates-Purgatorius(a single tooth);fish-Micropristis MT0166
Oswego McCone MT 24km S on Shade Creek Cretaceous Hell Creek vertebrates-dinosaurs-Triceratops MT0167 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
White Sulphur Springs Meagher MT near Little Birch Creek Precambrian Brachiopods to 4 cm. MT0169
Melstone Musselshell MT 16km N Cretaceous Judith River vertebrates-dinosaurs;turtles MT0170 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Carbella Park MT to SW in Miner Basin just outside Yellowstone Park boundaries Petrified Wood MT0171
Cooke City Park MT SE S of US12 just over Wyoming Line Devonian Lower Beartooth Butte Fossils MT0172
Lodgepole Creek Phillips MT In Little Rocky Mountains Cambrian Middle-Cambrian Upper Trilobites-Cedaria,Arapahoia,Crepicephalus,Elvinia and several other genera MT0209
Badger Creek Pondera MT 4km above mouth of creek Cretaceous Two Medicine dinosaur bones MT0174
Dupuyer Pondera MT 27.2km NW Cretaceous Two Medicine dinosaur bones MT0175
– Pondera,Glacier MT in 550 meters of greenish clays non-marine and sandstones with thin marine layer in Middle oysters,muscles,snails,plants,dinosaur bones. MT0176
– Pondera,Glacier MT in gray limy shales capped by sandstone Cretaceous Upper Bearpaw Shale oysters,muscles,and other fresh water mollusks MT0177
Bay Horse Powder River MT nearby Paleocene Tounge River fish-Knightia MT0178
Snow Creek Rosebud MT In breaks of Snow Creek Cretaceous Hell Creek vertebrates-dinosaurs-Paronychodon,Triceratops MT0179 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
– Sweet Grass MT area exposures–Clay Butte (s9t3R15), Gidley Quarry Paleocene Fort Union vertebrates-turtles;mammals-Adunator,Anconodon,Anisonchus,Aphronorus,Arctocyonoides[?],Avunculus,Chriacus,Coriphagus,Cynarctus,Ectypodus,Eudaemonema,Gelastops,Haplaletes,Ictidopappus,Leptacodon,Litaletes,Litomylus,Mimetodon,Mimotricentes,Myrmecoboides,Neo MT0187 ‘Arctocyonoides’ is probably a misspelling or an obscure synonym for some other form. CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Big Timber Sweet Grass MT 20 km N E of US191 Mammal Fossils MT0180
Big Timber Sweet Grass MT 20 km N W of US191 in Crazy Mountains Fossils MT0181
Big Timber Sweet Grass MT 40 km NE in Fish Creek Hills Reptile Fossils. MT0182
Crazy Mountain Sweet Grass MT Area Exposures? Gidley Quarry,This is often referred to as the ‘Crazy Mountain Field’ and sometimes as the ‘Crazy Mountain Basin’ Paleocene Lebo Amphibians-Habrosaurus,Opisthotriton;Scapherpeton;birds;crocodiles;mammals;Squamata-Machaerosaurus,Palaeoxantusia,Peltosaurus,Proxestops MT0183
Gidley Quarry Sweet Grass MT Paleocene Upper Fort Union Mammal Fossils MT0184
Scarritt Quarry Sweet Grass MT Paleocene Fort Union vertebrates-reptiles-Champsosaurus;mammals-Carpodaptes,Dissacus,Elpidophorus,Ignacius,Leptacodon,Litolestes,Lipotyphla,Neoplagiaulax,Palaeosinopa,Paleotomus,Pantolambda,Plesiadapis,Propalaeosinopa,Thryptacodon MT0185 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Siberling Quarry[?] Sweet Grass MT Paleocene Fort Union mammals-Picrodus,Promioclaenus,Propalaeosinopa MT0186 Albert C. Siberling was a Smithsonian vertebrate collector active in the late 19th and early 20th Century
Choteau Teton MT 28.8km W Cretaceous Two Medicine dinosaur bones-Hadrosaurus MT0188
Willow Creek Anticline Teton MT Cretaceous Two Medicine dinosaur eggs MT0189
– Valley MT in area exposures Cretaceous Upper Bearpaw Shale Baculites MT0193
Glasgow Valley MT 48km S Cretaceous Hell Creek dinosaurs-Tyrannosaurus;pterosaurs MT0190
Lismas Valley MT 28.8 km at Bear Creek Coal Mine Cretaceous Hell Creek vertebrates-dinosaur bones MT0191 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Missouri River Valley MT along River and tributaries Cretaceous Pierre Ostrea,Avicula,Inoceramus,Chlamys,Yoldia,Nucula,Lucina,Protocardia,Callista,Lunatia,Scaphites,Nautilus,Modiola,Veniella,Anchura,Haminea,Pyrofusus,Dentalium,Baculites MT0192
Bear Butte Wheatland MT NW of Bear Butte Paleocene Fort Union vertebrates-crocodile teeth MT0194 CAUTION:Collecting vertebrate material in the US requires landowner or government permission
Harlowtown Wheatland MT Gastropod Goniobasis MT0195
Harlowtown Wheatland MT 19.2km SE at Middle Dome Cretaceous Kootenai Turtles-Naomichelys MT0196
Harlowtown Wheatland MT At Middle Dome 19.2km SE Cretaceous Cloverly reptiles-Microvenator,Tenontosaurus;crocodiles;turtles-Naomichelys MT0197
Harlowtown Wheatland MT SE Fossils MT0198
Shawmut Wheatland MT 48km SE on Ridge Cretaceous Hell Creek Sandstone ammonites,Sphenodiscus,Acanthoscaphites Baculites. MT0199
Shawmut Wheatland MT at KT boundary Cretaceous-Paleocene plant remains –Auricaria,crocodile teeth and scales,fish scales,saurian teeth,coal,petrified wood. MT0200
Bloom Locality Wibaux MT Two localities at 46.69N,104.341W Cretaceous Hell Creek dinosaurs-Ornithomimus MT0201
Bloom Locality Wibaux MT Two localities at 47.0076N,104.5548W Cretaceous Hell Creek dinosaurs-Ornithomimus MT0201
– [?] MT Cretaceous Judith River Nodosaur –Edmontonia,Ankylosaur — Euplocephalus MT0203
– [?] MT Along Missouri R in NE MT Cretaceous Pierre ? MT0204
– [?] MT Along Missouri Rive tributaries in NE MT Cretaceous Pierre ? MT0205
– [?] MT Regional exposures in E part of state Paleocene Fort Union Fossil Plants MT0206
Judith River [?] MT Cretaceous Hell Creek fish-Lepisosteus? MT0202
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