page_title: List of the Mesozoic life of Montana
section_title: M
hierarchical_section_title: List of the Mesozoic life of Montana / M
caption_attribution_description: English: Mercuriceratops gemini
context_page_description: This list of the Mesozoic 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 252.17 and 66 million years of age.
context_section_description: †Magadiceramus
  †Magadiceramus soukupi
  †Magnuviator – type locality for genus
  †Magnuviator ovimonsensis – type locality for species
  †Maiasaura – type locality for genus
  †Maiasaura peeblesorum – type locality for species
  †Marchantiolites
  †Marchantiolites blairmorensis
  †Marmarthia
  †Marmarthia trivialis
  †Medusaceratops – type locality for genus
  †Medusaceratops lokii – type locality for species
  †Meleagrinella
  †Meleagrinella curta
  †Melvius – type locality for genus
  †Melvius thomasi – type locality for species
  †Meniscoessus
  †Meniscoessus major
  †Meniscoessus robustus – type locality for species
  †Meniscognathus
  †Meniscognathus altmani
   †Mercuriceratops – type locality for genus
  †Mercuriceratops gemini – type locality for species
  †Mesodma
  †Mesodma formosa
  †Mesodma hensleighi
  †Mesodma primaeva
  †Mesodma thompsoni
  †Metoicoceras
  †Metoicoceras geslinianum
  †Metoicoceras mosbyense – type locality for species
  †Metoicoceras muelleri
  †Metzgeriites
  †Metzgeriites montanensis – type locality for species
  †Micrabacia
  †Micrabacia radiata
  †Microsulcatoceras – type locality for genus
  †Microsulcatoceras puzosiiforme – type locality for species
   †Microvenator – type locality for genus
  †Microvenator celer – type locality for species
  †Minerisporites
  †Minerisporites pseudorichardsonii
  †Miocidaris
  †Modiolus
  †Modiolus rosii
  †Monoclonius – type locality for genus
  †Monoclonius crassus – type locality for species
  †Monoclonius recurvicornis – type locality for species
  †Monoclonius sphenocerus – type locality for species
  †Monosulcites
  †Monosulcites riparius
  †Montanalestes
  †Montanalestes keeblerorum
   †Montanazhdarcho – type locality for genus
  †Montanazhdarcho minor – type locality for species
  †Montania – type locality for genus
  †Montania glandulosa – type locality for species
  †Montanoceratops
  †Montanoceratops cerorhynchus – type locality for species
  †Montanoolithus – type locality for genus
  †Montanoolithus strongorum – type locality for species
  †Moremanoceras
  †Moremanoceras costatum
  †Moremanoceras montanaense – type locality for species
  †Moremanoceras straini
  †Mosasaurus
  †Mosasaurus missouriensis
  †Myalina
  †Myalina postcarbonica
  †Myledaphus
  †Myledaphus bipartitus
   †Mytilus
caption: Life restoration of the Late Cretaceous horned dinosaur Mercuriceratops
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