Sarmiento Formation
Geologic formation in Chubut Province, Argentina
The Sarmiento Formation (Spanish : Formación Sarmiento ), in older literature described as the Casamayor Formation , is a geological formation in Chubut Province , Argentina , in central Patagonia , which spans around 30 million years from the mid-Eocene to the early Miocene . It predominantly consists of pyroclastic deposits,[ 1] semi-arid environment.[ 2] [ 1] South American native ungulates (notoungulates , litopterns , astrapotheres ) as well as armadillos , and caviomorph rodents .[ 3]
Paleofauna
Amphibians
Birds
Reptiles
Crocodylomorphs
Name
Species
Member/Locality
Material
Notes
Image
Eocaiman [ 9] E. cavernensis
Gran Barranca Member
A caiman
Sebecus [ 10] S. icaeorhinus
Gran Barranca Member
Disarticulated skull, mandible, and some postcranial material.
A sebecid notosuchian .
Lepidosaurs
Testudines
Mammals
Meridiolestidans
Meridiungulates
Xenarthrans
Name
Species
Member/Locality
Material
Notes
Image
Archaeutatus [ 3] [ 61] A. malaspinensis
A. sp.
Upper Puesto Almendra Member
Astegotherium [ 32] A. dichotomum
Gran Barranca Member
Barrancatatus [ 61] B. rigidus
B. maddeni
B. sp.
Vera and Upper Puesto Almendra Members
Clypeotherium C. magnum
Upper Puesto Almendra Members
Cochlops C. sp.
Colhué Huapí Member
Glyptodontinae indet.[ 62] [ 3] [ 43] Currently undescribed
Colhué Huapí and Upper Puesto Almendra Members
Hapaloides [ 62] H. ignavus
H. laeviusculus
H. ponderosus
H. sp.
Colhué Huapí Member
Holomegalonyx [ 62] H. menendezi
Colhué Huapí Member
Machlydotherium [ 62] [ 3] M. ater
M. sparsum
M. sp.
Gran Barranca, Rosado, Upper Puesto Almendra, and Vera Members
Mazzoniphractus [ 61] M. ingens
Rosado Member
Megalonychidae indet.[ 43] Currently undescribed
Colhué Huapí Member
Meteutatus [ 62] [ 3] [ 7] M. anthinus
M. ascendens
M. concavus
M. confluens
M. lagenaformis
M. lucidus
M. minutus
M. nepotulus
M. percarinatus
M. tortuosus
M. sp.
Gran Barranca, Rosado, Upper Puesto Almendra, and Vera Members
Nematherium [ 46] N. sp.
Colhué Huapí Member
Octodontotherium [ 7] O. grande
O. crassidens
Upper Puesto Almendra Member
Palaeopeltis [ 7] P. inornatus
Upper Puesto Almendra Member
Parutaetus [ 63] [ 61] [ 3] P. chicoensis
P. chilensis
P. clusus
P. signatus
Gran Barranca, Rosado, Upper Puesto Almendra, and Vera Members
Peltephilus [ 3] [ 46] P. pumilus
P. undulatus
P. sp.
Colhué Huapí and Upper Puesto Almendra Members
Peltephilidae indet.[ 62] Currently undescribed
Colhué Huapí, Rosado, Upper Puesto Almendra, and Vera Members
Proeuphractus [ 7] P. setiger
Upper Puesto Almendra Member
Proeutatus [ 62] [ 64] P. oenophorum
Proeutatus robustus
P. sp.
Colhué Huapí Member
Propalaehoplophorus P sp.
Colhué Huapí Member
Proplatyarthrus [ 32] P longipes
Vera Member
Proschismotherium [ 42] [ 62] P. oppositum
P. sp.
Colhué Huapí Member
Prostegotherium [ 42] [ 21] P. astrifer
P. notostylopianum
P. sp.
Gran Barranca Member
Prozaedyus [ 7] [ 62] [ 64] [ 46] P. humilis
P. impressus
P. planus
P. sp.
Colhué Huapí and Upper Puesto Almendra Members
Pseudoglyptodon [ 65] [ 3] P. chilensis
Gran Barranca and Upper Puesto Almendra Members
Stegosimpsonia [ 62] [ 61] S. chubutanum
Colhué Huapí, Gran Barranca, and Rosado Members
Stegotherium [ 62] [ 66] [ 61] [ 46] S. caroloameghinoi
S. pascuali
S. tessellatum
S. variegatum
Colhué Huapí Member
Stegotheriini indet.[ 61] Currently undescribed
Colhué Huapí, Rosado, Upper Puesto Almendra, and Vera Members
Stenotatus [ 62] [ 63] [ 46] S. centralis
S. patagonicus
S. ornatus
S sp.
Colhué Huapí, Upper Puesto Almendra, and Vera Members
Utaetus [ 42] [ 62] [ 61] U. buccatus
U. deustus
U. laevus
U. lenis
Gran Barranca and Rosado Members
Rodents
Primates
Bats
Name
Species
Member/Locality
Material
Notes
Image
Mormopterus M. barrancae
M. sp.
Colhué Huapí Member
Phyllostominae indet.
Currently undescribed
Colhué Huapí Member
References
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Ages Defining
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