Solimões Formation
Geologic formation in Brazil
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The Solimoes Formation is a geologic formation located in the states of Acre and Amazonas in northwest Brazil. It preserves many fossils dating to the Miocene epoch of the Neogene period.
| Solimões Formation | |
|---|---|
| Stratigraphic range: Tortonian-Messinian (Huayquerian-Montehermosan) ~ | |
| Lithology | |
| Primary | Conglomerate, Sandstone |
| Location | |
| Region | Acre |
| Country | Brazil |
| Extent | Acre Basin |
  Solimões Formation (Brazil) | |
Description
The Solimoes Formation is situated in the Acre Basin, a sedimentary basin formed by Andean tectonic events that occurred along the west margin of South America in the Neogene.[1] It is traditionally dated to the Late Miocene by biostratigraphy and zircon geochronology.[1] The formation is mostly consists of mudstones, siltstones and muddy sandstones, deposited under fluvio-lacustrine settings.[1]
Paleofauna
A diverse fauna of vertebrates have been discovered from the Solimoes Formation. The following vertebrates have been discovered. [2]
Mammalia
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Primates
| Taxon | Species | Location | Stratigraphic position | Material | Notes | Images |
|---|---|---|---|---|---|---|
| Acrecebus | A. fraileyi | Rio Acre, Patos and Cachoeria do Bandeira | A cebid monkey | |||
| Solimoea | S. acrensis | Rio Acre, Patos and Cachoeria do Bandeira | An ateline monkey | |||
| cf. Stirtonia (mammal) [3] | S. sp. | An ateline monkey | ||||
| Parabrachyteles | P. vesperus | An ateline monkey | ||||
| Migmacebus.[4] | M. juruaensis | A cebid monkey | ||||
Marupials
| Taxon | Species | Location | Stratigraphic position | Material | Notes | Images |
|---|---|---|---|---|---|---|
| Didelphis | D. solimoensis | An early opossum | ||||
| Lutreolina | L. materdei | A lutrine opossum | ||||
Rodents
| Taxon | Species | Location | Stratigraphic position | Material | Notes | Images |
|---|---|---|---|---|---|---|
| Eumegamys | E. paranensis | |||||
| Ferigolomys | F. pacarana | |||||
| Neoepiblema | N. horridula | |||||
| Neoreomys | N. huilensis | A caviomorph rodent | ||||
| Phoberomys | P. burmeistri | A giant rodent.[1] | ||||
| Potamarchus | P. adamiae | A dinomyid rodent | ||||
| P. murinus | ||||||
| Pseudopotamarchus | P. villanuevai | |||||
| Scleromys | S. colombianus | A dinomyid rodent | ||||
| Telicomys | T. amazonensis | |||||
Notoungulates
| Taxon | Species | Location | Stratigraphic position | Material | Notes | Images |
|---|---|---|---|---|---|---|
| Abothrodon | A. pricei | A haplodontheriidae | ||||
| Gyrinodon | G. quassus | A toxodont | ||||
| Haplodontherium | H. wildei | A haplodontheriidae | ||||
| Mesenodon | M. juruaenisis | A toxodont | ||||
| Mesotoxodon | M. pricei | A haplodontheriidae | ||||
| Minitoxodon | M. acrensis | A toxodont | ||||
| Neotrigodon | N. utoquineae | A haplodontheriidae | ||||
| Neotoxodon | N. pascuali | A toxodont | ||||
| Plesiotoxodon | P. amazonensis | A toxodont | ||||
| Purperia | P. cribatidens | A Leontiniid | ||||
| Toxodon | T. sp | A toxodont | ||||
| Trigodon | T. sp | A large horned toxodont.[5] | ||||
| Trigodonops | T. lopesi | A haplodontheriidae | ||||
Xenarthrans
| Taxon | Species | Location | Stratigraphic position | Material | Notes | Images |
|---|---|---|---|---|---|---|
| Kraglievichia | K. carinatum | A pampatheriid armadillo |  | |||
| Mionothropus | M. cartellei | A nothrotheriid ground sloth | ||||
| Pseudoprepotherium | P. venezualem | A ground sloth.[1] | ||||
| Octodontobradys | O. puruensis | A mylodontid ground sloth | ||||
| Urumacotherium | U. campbelli | A mylodontid ground sloth | ||||
Reptilia
| Taxon | Species | Location | Stratigraphic position | Material | Notes | Images |
|---|---|---|---|---|---|---|
| Purussaurus | P. brasiliensis | A giant caiman.[1] |   | |||
| Chelus | C. colombianus | A mata mata | ||||
| Gryposuchus | G. jessei | A large gavialoid.[1] | ||||
| Mourasuchus | M. amazonensis | A large flat-snouted caiman.[6] | ||||
| Eunectes | E. sp | A prehistoric anaconda.[1] | ||||
| Stupendemys | S. souzai | A giant podocnemidid side-necked turtle | ||||
Aves
| Taxon | Species | Location | Stratigraphic position | Material | Notes | Images |
|---|---|---|---|---|---|---|
| Anhinga | A. fraileyi | |||||
| A. grandis | ||||||
| A. minuta | ||||||
| Phorusrhacidae indet. | Indeterminate | A large indeterminate phorusrhacid.[7][8] | ||||
| Macranhinga | M. ranzii | A large relative of the Anahinga.[1] | ||||
Fish
| Taxon | Species | Location | Stratigraphic position | Material | Notes | Images |
|---|