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Alachua Formation
Stratigraphic range: Early-Late Miocene (Hemingfordian-Hemphillian)
~20–5.3Ma
Type Formation
Lithology
Primary Claystone, sandstone
Other Phosphorite
Location
Coordinates 29°42′N 82°36′W / 29.7°N 82.6°W / 29.7; -82.6
Approximate paleocoordinates 29°48′N 80°54′W / 29.8°N 80.9°W / 29.8; -80.9
Region Florida
Country  United States
Type section
Named for Alachua, Florida

The Alachua Formation is a Miocene geologic formation in Florida. The claystones, sandstones and phosphorites of the formation preserve many fossils of mammals, birds, reptiles and fish, among others megalodon.

Fossil content

The formation has provided the following fossils.

Mammals

Rodents
  • Harrymys magnus
  • Nototamias hulberti
  • Petauristodon pattersoni
  • Proheteromys floridanus
  • cf. Miospermophilus sp.
  • Mylagaulus kinseyi
  • cf. Texomys sp.
  • Lagomorpha indet.
  • Mylagaulidae indet.
Carnivora
  • Amphicyon longiramus
  • Borophagus orc
  • B. pugnator
  • Cynelos caroniavorus
  • Enhydritherium terraenovae
  • Epicyon haydeni
  • E. saevus
  • Eucyon davisi
  • Euoplocyon spissidens
  • Leptarctus ancipidens
  • Metatomarctus canavus
  • Oligobunis floridanus
  • Osbornodon iamonensis
  • Phoberocyon johnhenryi
  • Zodiolestes freundi
  • Borophagus sp.
  • Phlaocyon sp.
  • Sthenictis sp.
  • Felidae indet.
  • Mustelinae indet.
Ground sloths
  • Pliometanastes protistus
  • Thinobadistes segnis
Gomphotheres
  • Amebelodon (Konobelodon) britti
  • Amebelodon sp.
Artiodactyls
  • Aepycamelus major
  • Diabolocornis simonsi
  • Floridachoerus olseni
  • Floridameryx floridanus
  • Floridatragulus dolichanthereus
  • Hemiauchenia minima
  • Machaeromeryx gilchristensis
  • Nothokemas floridanus
  • Parablastomeryx floridanus
  • Pediomeryx hemphillensis
  • Prosynthetoceras texanus
  • Synthetoceras australis
  • S. cf. tricornatus
  • Yumaceras hamiltoni
  • Aepycamelus sp.
  • Hemiauchenia sp.
  • Merycoidodon sp.
  • Antilocapridae indet.
  • Camelidae indet.
  • Ruminantia indet.
  • Tayassuidae indet.
  • Tayassuinae indet.
Soricomorpha
  • Karstala silva
  • Miomyotis floridanus
  • Primonatalus prattae
  • Suaptenos whitei
  • Limnoecus sp.
  • Chiroptera indet.
Perissodactyls
  • Anchitherium clarencei
  • Aphelops malacorhinus
  • A. mutilus
  • Archaeohippus blackbergi
  • Calippus elachistus
  • Calippus hondurensis
  • Calippus maccartyi
  • Cormohipparion emsliei
  • C. ingenuum
  • C. plicatile
  • Floridaceras whitei
  • Menoceras barbouri
  • Nannippus aztecus
  • N. morgani
  • N. westoni
  • Neohipparion trampasense
  • Parahippus leonensis
  • Protohippus gidleyi
  • Pseudhipparion skinneri
  • Tapirus webbi
  • Teleoceras proterum
  • Hipparion cf. tehonense
  • cf. Astrohippus sp.
  • Dinohippus sp.
Sirenians
  • Metaxytherium cf. floridanum
Lipotyphla
Theriiformes
  • Vespertilionidae indet.

Birds

  • Anhinga grandis
  • A. subvolans
  • Boreortalis laesslei
  • Ereunetes rayi
  • Jacana farrandi
  • Nycticorax fidens
  • Phalacrocorax wetmorei
  • Promilio brodkorbi
  • P. epileus
  • P. floridanus
  • Rhegminornis calobates
  • Thomasococcyx philohippus
  • Anatidae indet.
  • Cuculidae indet.

Reptiles

Turtles
  • Floridemys nana
  • Hesperotestudo turgida
  • Macrochelys auffenbergi
  • Pseudemys caelata
  • P. carri
  • P. williamsi
  • Testudo tedwhitei
  • Apalone sp.
  • Deirochelys sp.
  • Pseudemys sp.
  • Trachemys sp.
Crocodiles
Snakes
  • Anilioides minuatus
  • Boa constrictor
  • Calamagras floridanus
  • Ogmophis pauperrimus
  • Paraoxybelis floridanus
  • Pseudocemophora antiqua
  • Pterygoboa sp.
Lizards

Amphibians

Anurans
  • Bufo praevius
  • Hyla goini
  • Proacris mintoni
  • Scaphiopus (Scaphiopus) holbrooki
  • Microhyla sp.
  • Rana sp.
Salamanders
  • Siren hesterna

Fish

Sharks
Rays
  • Pristis sp.
Others
  • Hemipristis serra
  • Lepisosteus sp.
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