List of the Paleozoic life of Montana

This list of the Paleozoic life of Montana contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Montana and are between 538.8 and 252.17 million years of age.

† Aenigmacaris cornigerum SCHRAM & HORNER 1979 from the Mississippian of Bear Gulch

Fossilized skeleton of the Carboniferous lobe-finned fish Allenypterus

Mold fossil of a shell of the Early Devonian-Late Triassic bivalve Aviculopecten

Restoration of the Carboniferous Chimaera relative Belantsea

Fossilized skeleton of the Carboniferous coelacanth Caridosuctor

Fossilized tooth of the shark Cladodus

Fossilized shell of the Late Devonian-Permian brachiopod Composita

Fossil of the Middle Ordovician-Carboniferous horn coral Cornulites

Fossilized shells of the Middle-Late Devonian brachiopod Cyrtospirifer

Life restoration of the Carboniferous Chimaera relative Delphyodontos

Illustration of the fossilized pygidium (tail segment) of the Cambrian trilobite Dikelocephalus

† Discoserra pectinodon Lund 2000 from the Mississippian of Bear Gulch

† Dithyrocaris rolfei Schram and Horner 1978 from the Mississippian of Bear Gulch

†Echinochimaera meltoni Lund 1977 from the Mississippian of Bear Gulch

Life restorations of a female (top) and male (bottom) of the Carboniferous Chimaera relative Falcatus

Fossil of the Early-Late Ordovician trilobite Geragnostus

Restoration (bottom) of the Carboniferous "antlered" Chimaera relative Harpagofututor

† Heteropetalus elegantulus Lund 1977 from the Mississippian of Bear Gulch

Fossilized shells of the Cambrian-Permian brachiopod relative Hyolitha

Restoration of the Carboniferous-Permian ray-like cartilaginous fish Janassa (top and left)

Fossil of the Cambrian trilobite Kendallina

Illustration of a fossilized shell of the Cambrian-Late Ordovician brachiopod Lingulella

Fossil of the Cambrian-Silurian trilobite Megistaspis

Fossilized shell of the Early Devonian – Triassic sea snail Naticopsis

Fossil of the Ordovician trilobite Ogyginus

† Paratarrasius hibbardi Carboniferous Bear Gulch, Montana

Fossilized theca of the Carboniferous blastoid echinoderm ("sea bud") Pentremites

Fossilized shell of the Late Devonian ammonoid cephalopod Platyclymenia

Restoration of the Silurian trilobite Proetus

Fossils of the Cambrian trilobite Ptychoparia

Fossilized shell of the Late Ordovician-Late Triassic brachiopod Spirifer

Life restorations of a male (foreground) and female (background) of the Late Devonian-Carboniferous Chimaera relative Stethacanthus

Fossil of the Devonian tabulate coral Syringopora