Cañadón Vaca (Eocene of Argentina)

Where: Chubut, Argentina (45.3° S, 68.0° W: paleocoordinates 47.8° S, 58.1° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Vacan zone, Sarmiento Formation, Lutetian (47.8 - 41.3 Ma)

• Sarmiento Formation, Vacan SALMA (a subdivision of the Casamayoran SALMA), middle Eocene (Woodburne et al. 2014).

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Preservation: permineralized

Reposited in the MACN

Primary reference: M. F. Soria. 1980. Una nueva y problemática forma de ungulado del Casamayorense. Actas del Segundo Congreso Argentino de Paleontología y Bioestratigrafía y Primer Congreso Latinoamericano de Paleontología II:193-203 [D. Croft/D. Croft/D. Croft]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 44956: authorized by Darin Croft, entered by Darin Croft on 22.09.2004, edited by Mark Uhen, Richard Butler, Jelle Zijlstra and Evangelos Vlachos

Creative Commons license: CC BY (attribution)

Taxonomic list

 Testudines -
"Chelonii indet." = Testudines5
"Chelonii indet." = Testudines5 Batsch 1788 turtle
Museo de la Plata
 Gruiformes - Phorusrhacidae
Psilopterinae indet.1 Dolgopol de Saez 1927 terror bird
 Loricata - Sebecidae
cf. Sebecus sp.4 Stirton 1953 crocodilian
AMNH 3162, tooth
Sebecus icaeorhinus9 Simpson 1937 crocodilian
AMNH 3159 (fragmentary cranial remains associated with vertebral centrum and fragmentary femur and fibula) and MMP 235 (fragmentary skull)
 Astrapotheria - Astrapotheriidae
Scaglia kraglievichorum n. gen. n. sp.11
Scaglia kraglievichorum n. gen. n. sp.11 Simpson 1957 placental
Museo Municipal de Mar del Plata, no. 207, partial skull
 Astrapotheria - Trigonostylopidae
Albertogaudrya indet.2 Ameghino 1901 placental
Trigonostylops ? wortmani11 Ameghino 1897 placental
AMNH 28450, isolated left upper molar. Referred to Trigonostylopidae indet. by Simpson (1967a, ref. 10312) but to ?Trigonostylops wortmani by Cifelli (1985, ref. 57836).
 Notoungulata - Notostylopidae
Homalostylops sp.2 Ameghino 1901 notoungulate
Partial jaw with p3-m2 and some isolated teeth. Referred to _H. parvus_ by Simpson (1948), but Cifelli (1985) suggested that they represent a distinct species.
Edvardotrouessartia sola10 Ameghino 1901 notoungulate
AMNH 28654, partial lower jaw with right p2 and m1, left p3-m1
Notostylops pendens10 Ameghino 1901 notoungulate
Many specimens, including: AMNH 28634, skull and jaw (neotype of Simpson, 1948), AMNH 28604, skull and jaw; AMNH 28614, skull; AMNH 28603, dentary with p3-m3
Notostylops appressus10 Ameghino 1902 notoungulate
AMNH 28589, mandible with p3-m1 and m3, neotype of Simpson (1948)
 Notoungulata - Isotemnidae
Thomashuxleya externa11 Ameghino 1901 notoungulate
AMNH 28447, skull; AMNH 28697, lower jaws; AMNH 28756, lower jaws; AMNH 28698, skull and jaws; AMNH 28686, dentary m3; AMNH 28757, partial skull; AMNH 28699, partial skull
Pleurostylodon similis11 Ameghino 1901 notoungulate
AMNH 28830, skull and mandible; AMNH 28636, associated right and left P1-M2 and p4-m2; AMNH 28631, p2-m3; AMNH 28661, p3-m1; AMNH 28797, dP1-4; AMNH 28685, P2-M2; AMNH 28874, M2-3
Isotemnus primitivus11 Ameghino 1897 notoungulate
AMNH 28650, P3-M3
 Notoungulata - Henricosborniidae
Henricosbornia lophodonta2 Ameghino 1901 notoungulate
Peripantostylops minutus10 Ameghino 1901 notoungulate
AMNH 28494, associated right upper and lower jaws with P3-M3 and p3-m3; AMNH 28986 and 28987, nine upper molars
Othnielmarshia lacunifera10 Ameghino 1901 notoungulate
AMNH 28978-28985 and 28988, eight lower and twelve upper molars
 Notoungulata - Oldfieldthomasiidae
"Maxschlosseria minuta" = Maxschlosseria praeterita11, "Maxschlosseria consumata" = Maxschlosseria praeterita11
"Maxschlosseria minuta" = Maxschlosseria praeterita11 Ameghino 1901 notoungulate
AMNH 28660, mandible m1-3
"Maxschlosseria consumata" = Maxschlosseria praeterita11 Ameghino 1901 notoungulate
Isolated upper and lower jaws and skeletal fragments; numerous isolated teeth
 Notoungulata - Notopithecidae
Notopithecus sp.8 Ameghino 1897 notoungulate
 Notoungulata - Archaeopithecidae
"Acropithecus rigidus" = Archaeopithecus rogeri11 Ameghino 1897 notoungulate
AMNH 28782, skull; AMNH 28884, left P2-M3, right M1-3, right m1-3, left m2-3; AMNH 28895, skull, mandible, and limb fragments; three partial maxillae with teeth; seven partial mandibles with teeth; ~150 isolated upper cheek teeth; ~150 isolated lower cheek teeth
Teratopithecus elpidophoros6 López et al. 2020 notoungulate
 Panameriungulata - Didolodontidae
Didolodus sp.12 Ameghino 1897 placental
MMP 696M, maxilla P2-4
Didolodus minor n. sp.10 Simpson 1948 placental
AMNH 28473, M1, holotype; AMNH 28471, P3; 28472, m2; 28470, m3; 28736, M fragment
 Panameriungulata - Macraucheniidae
Victorlemoineia indet.10 Ameghino 1901 placental
AMNH 28468, M1; 28466, M3; 28465, m1 or m2; 28467, m3
 Panameriungulata - Proterotheriidae
Ricardolydekkeria cf. praerupta10 Ameghino 1901 placental
Josepholeidya adunca10 Ameghino 1901 placental
Upper molars
Anisolambda amel n. sp.10 Simpson 1948 placental
AMNH 28503, mandible, holotype; three lower molars
Anisolambda fissidens2 Ameghino 1901 placental
 Panameriungulata - Adianthidae
Adiantoides magnus n. sp.3 Cifelli and Soria 1983 placental
AMNH 28888, dentary m2-3, holotype
 Panameriungulata - Sparnotheriodontidae
Sparnotheriodon epsilonoides Soria 1980 placental
Holotype, MACN 18225, pair of mandibles
 Panameriungulata - Protolipternidae
Asmithwoodwardia cf. subtrigona10 Ameghino 1901 placental
AMNH 28469
 Polydolopimorphia - Polydolopidae
"Polydolops serra" = Polydolops serra7, "Polydolops bocurhor n. sp." = Polydolops serra10, Polydolops thomasi7
"Polydolops serra" = Polydolops serra7 Ameghino 1902 metatherian
AMNH 28425 (M2), 28426 (M2), 28427 (right M2-3, holotype of _Polydolops bocurhor_), 28429. See also Simpson (1948:62).
"Polydolops bocurhor n. sp." = Polydolops serra10 Ameghino 1902 metatherian
AMNH 28427, right M2-3, type; AMNH 28425, M2; AMNH 28426, M2
Polydolops thomasi7 Ameghino 1897 metatherian
AMNH 28420, 28424, 28428, 28443, 28444
 Sparassodonta -
Patene sp.10 Simpson 1935 metatherian
"An isolated upper molar from the Casamayor in Cañadón Vaca suggest the presence of a second, somewhat larger species [of _Patene_], but it is inadequate for certain determination."
 Theriamorpha -
Ideodelphys microscopicus10 Ameghino 1902 marsupial
AMNH 28423, edentulous dentary
Florentinoameghinia mystica11 Simpson 1932 mammal
AMNH 28402, three upper cheek teeth and skull fragments