page_title: List of the Cenozoic life of Wyoming
section_title: M
hierarchical_section_title: List of the Cenozoic life of Wyoming / M
caption_attribution_description: English: Crop of file in filename
context_page_description: This list of the Cenozoic life of Wyoming contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Wyoming and are between 66 million and 10,000 years of age.
context_section_description: †Maceopolipollenites
  †Maceopolipollenites amplus
  †Maceopolipollenites leboensis
  †Maceopolipollenites rotundus
  †Maceopolipollenites tenuipolus
  †Maceopolipollenites triorbicularis
  †Macginitiea
  †Macginitiea gracilis
  †Macginitiea wyomingensis
   †Machaeroides
  †Machaeroides eothen
  †Machaeroides simpsoni – type locality for species
  †Machaerosaurus
  †Machaerosaurus torrejonensis
  Macrocranion
  †Macrocranion junnei – type locality for species
  †Macrocranion nitens
  †Macrocranion robinsoni
  †Macrotarsius
  †Macrotarsius siegerti – type locality for species
   Magnolia
  †Magnolia borealis
  †Magnolia californica
  †Magnolia culveri
  †Magnolia magnifica
  †Magnolia magnifolia
  †Magnolia microphylla
  †Magnolia pollardi
  †Magnolia spectabilis
  †Maiorana
  †Maiorana ferrisensis – type locality for species
  †Maiorana noctiluca
  †Malapoenna
  †Malapoenna cuneata
  †Malapoenna lamarensis
  †Malaquiferus
  †Malaquiferus tourteloti – type locality for species
  †Malfelis – type locality for genus
  †Malfelis badwaterensis – type locality for species
  †Mammacyon
  †Mammacyon ferocior – type locality for species
  †Mammuthus
   †Mammuthus columbi
  Marmota
  †Marsholestes
  †Marsholestes dasypelix – type locality for species
  †Mattimys
  †Mattimys kalicola
  †Megacerops
  †Megacerops osborni – type locality for species
  †Megadelphus
  †Megadelphus lundeliusi
  †Megalagus
  †Megalagus brachyodon
  †Megalagus primitivus
  †Megalagus turgidus
  †Megalesthonyx
  †Megalesthonyx hopsoni
   †Megalictis
  †Megalictis ferox
  †Megalictis petersoni
  †Melanosaurus – type locality for genus
  †Melanosaurus maximus – type locality for species
  †Melastomites
  †Melastomites montanensis
  †Meliakrouniomys
  †Meliakrouniomys skinneri
  †Meliosma
  †Meliosma flexuosa
  †Meliosma longifolia
   †Meniscotherium
  †Meniscotherium chamense
  †Meniscotherium priscum
  †Meniscotherium tapiacetum
  †Meniscotherium tapiacitum
  †Menisperimites
  †Menisperimites parvareolatus
  †Menispermites
  †Menispermites limacioides – type locality for species
  †Menispermites parvareolatus
   †Menoceras
  †Menoceras arikarense
  †Menoceras barbouri
  †Menops
  †Menops heloceras
  †Menops marshi – or unidentified comparable form
  †Mentoclaenodon
  †Mentoclaenodon acrogenius – type locality for species
  Mergus
  †Mergus merganser
   †Merychippus
  †Merychippus coloradense
  †Merychippus insignis – or unidentified comparable form
  †Merychippus primus
  †Merychyus
  †Merychyus arenarum
  †Merychyus crabilli
  †Merychyus elegans – or unidentified comparable form
  †Merychyus minimus
  †Merycobunodon – tentative report
  †Merycobunodon walshi – type locality for species
  †Merycochoerus
  †Merycochoerus chelydra
  †Merycochoerus magnus
  †Merycochoerus matthewi
   †Merycodus
  †Merycodus sabulonis – or unidentified comparable form
  †Merycodus warreni – or unidentified comparable form
  †Merycoides
  †Merycoides longiceps
  †Merycoides pariogonus
  †Merycoidodon
  †Merycoidodon culbertsoni – type locality for species
  †Merycoidodon major
  †Merycoidodon presidioensis – or unidentified comparable form
  †Mesatirhinus
  †Mesatirhinus megarhinus
  †Mesocyon – report made of unidentified related form or using admittedly obsolete nomenclature
  †Mesocyon temnodon
  †Mesodma
  †Mesodma ambigua – type locality for species
  †Mesodma formosa
  †Mesodma garfieldensis – or unidentified comparable form
  †Mesodma hensleighi
  †Mesodma pygmaea
   †Mesohippus
  †Mesohippus bairdi
  †Mesohippus westoni – or unidentified comparable form
  †Mesomeryx – or unidentified comparable form
  †Mesomeryx grangeri
  †Mesonyx
  †Mesonyx obtusidens – type locality for species
  †Mesoreodon
  †Mesoreodon chelonyx
  †Mesoreodon minor – type locality for species
  †Mesoscalops
  †Mesoscalops scopelotemos
   †Metacheiromys
  †Metacheiromys dasypus – type locality for species
  †Metacheiromys marshi – type locality for species
  †Metadjidaumo
  †Metadjidaumo hendryi – type locality for species
  †Metamynodon
  †Metamynodon planifrons – or unidentified comparable form
  †Metanoiamys
  †Metanoiamys paradoxus
  †Metarhinus
  Metasequoia
  †Metasequoia occidentalis
  †Metatomarctus
  †Metatomarctus canavus
   †Miacis
  †Miacis deutschi
  †Miacis exiguus
  †Miacis latidens
  †Miacis medius
  †Miacis parvivorus – type locality for species
  †Miacis petilus
  †Miacis vorax
  †Michenia
  Micra
caption: Life restoration of the Miocene chalicothere mammal Moropus threatening a pair of the bear-dog Daphoenodon. Jay Matternes (1964).
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