Cañadón Hondo, Kibenikhoria Faunal Zone: Riochican, Argentina
collected by Piatnitzky, Scarritt Expedition, Feruglio 1931

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
? Litopterna indet. Ameghino 1889
1 specimen
AMNH 28572
    = Litopterna indet.
Vera and Krause 2020
Reptilia - Madtsoiidae
? Madtsoia sp. Simpson 1933
Albino 1993 4 specimens
MACN 18951, incomplete centrum from mid-trunk vert; UNPSJB-PV 477 to 479, three very fragmentary vertebral centra
Mammalia
Gashternia ctalehor n. gen., n. sp. Simpson 1935
1 specimen
AMNH 28533 (holotype)
Mammalia - Sparassodonta - Borhyaenidae
Patene sp. Simpson 1935
1 specimen
AMNH 28532
    = Borhyaenidae indet. Savage 1951
Marshall 1981
Mammalia - Polydolopidae
? Polydolops kamektsen n. sp. Simpson 1935
1 specimen
recombined as Pliodolops kamektsen
AMNH 28525 (holotype)
Mammalia - Astrapotheria - Trigonostylopidae
Shecenia ctirneru n. gen., n. sp. Simpson 1935
1 specimen
AMNH 28531
    = Trigonostylopidae indet. Ameghino 1901
Vera and Krause 2020
Seudenius cteronc n. gen., n. sp. Simpson 1935
1 specimen
AMNH 28538
    = Trigonostylops sp. Ameghino 1897
Vera and Krause 2020
Mammalia - Notoungulata - Henricosborniidae
? Peripantostylops orehor n. sp. Simpson 1935
2 specimens
AMNH 28526 (holotype). AMNH 28555 (paratype)
    = Henricosbornia lophodonta Ameghino 1901
Vera and Krause 2020
Henricosbornia waitehor n. sp. Simpson 1935
1 specimen
AMNH 28530 (holotype)
    = Henricosbornia lophodonta Ameghino 1901
Vera and Krause 2020
Mammalia - Notoungulata - Oldfieldthomasiidae
? Notostylopidae indet. Ameghino 1897
1 specimen
AMNH 28556
    = Kibenikhoria get Simpson 1935
Vera and Krause 2020
Kibenikhoria get n. gen., n. sp. Simpson 1935
5 specimens
AMNH 28542 (holotype). AMNH 28563 (paratype). AMNH 28544, 28548, 28543
Mammalia - Notoungulata - Archaeopithecidae
? Transpithecus sp. Ameghino 1901
1 specimen
AMNH 28578
    = Archaeopithecidae indet. Ameghino 1897
Vera 2012
Based on AMNH 28534 and 28578, which apparently had been confused in the AMNH collection. Vera (2012) identified both as Archaeopithecidae.
Notopithecidae indet. Ameghino 1897
Isolated teeth and jaw fragments
    = Archaeopithecidae indet. Ameghino 1897
Vera 2012
Mammalia - Notoungulata - Isotemnidae
? Isotemnus ctalego n. sp. Simpson 1935
2 specimens
AMNH 28568
Isotemnidae indet. Ameghino 1897
2 specimens
Two teeth
    = Isotemnus cf. ctalego Simpson 1935
Vera and Krause 2020
Mammalia - Panameriungulata - Didolodontidae
Ernestokokenia yirunhor n. sp. Simpson 1935
1 specimen
AMNH 28539 (holotype)
see common names

Geography
Country:Argentina State/province:Chubut
Coordinates: 45.4° South, 67.7° West (view map)
Paleocoordinates:48.0° South, 57.5° West
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period:Paleogene Epoch:Paleocene
Stage:Thanetian 10 m.y. bin:Cenozoic 1
*Period:Early/Lower Tertiary *Epoch:Late/Upper Paleocene
*Local age/stage:Riochican
Key time interval:Riochican Mammal zone: Riochican
Age range of interval:57.00000 - 55.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Río Chico Formation:Las Flores
Stratigraphic resolution:group of beds
Stratigraphy comments: Mid–late Ypresian; Upper Las Flores Formation (e.g. Visser Member sensu Andreis, 1977); Kibenikhoria Faunal Zone of Simpson (1935), previously assigned to Itaboraian SALMA, but revised to Riochican SALMA by Vera and Krause (2020)
Lithology and environment
Primary lithology:medium,coarse sandstone
Includes fossils?Y
Environment:alluvial fan
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Disassociated minor elements:many
Collection methods and comments
Collection methods:field collection,survey of museum collection
Reason for describing collection:taxonomic analysis
Museum repositories:AMNH
Collectors:Piatnitzky, Scarritt Expedition, Feruglio Collection dates:1931
Metadata
Also known as:Canadon Hondo
Database number:14205
Authorizer:J. Alroy, P. Mannion, J. Zijlstra, P. Barrett, R. Butler Enterer:J. Wertheim, J. Zijlstra, R. Butler, P. Mannion, T. Cleary
Modifier:M. Carrano Research group:vertebrate
Created:2002-05-23 09:57:40 Last modified:2022-10-07 16:18:00
Access level:the public Released:2002-05-23 09:57:40
Creative Commons license:CC BY
Reference information

Primary reference:

6147.5% 49100G. G. Simpson. 1935. Descriptions of the oldest known South American mammals, from the Rio Chico Formation. American Museum Novitates 793:1-25 [J. Alroy/J. Wertheim/J. Wertheim]

Secondary references:

59238 A. M. Albino. 1993. Snakes from the Paleocene and Eocene of Patagonia (Argentina): paleoecology and coevolution with mammals. Historical Biology 7:51-69 [P. Barrett/T. Cleary]
58306 L. G. Marshall. 1981. Review of the Hathlyacyninae, an extinct subfamily of South American "dog-like" marsupials. Fieldiana Geology 7:1-120 [J. Zijlstra/J. Zijlstra]
57551 G. G. Simpson. 1935. Occurrence and relationships of the Rio Chico fauna of Patagonia. American Museum Novitates 818:1-21 [R. Butler/R. Butler]
58097 B. Vera. 2012. Revisión del género Transpithecus Ameghino, 1901 (Notoungulata, Interatheriidae) del Eoceno medio de Patagonia, Argentina. Ameghiniana 49(1):60-74 [J. Zijlstra/J. Zijlstra/J. Zijlstra]
73732 B. Vera and J. M. Krause. 2020. New insights into the Kibenikhoria and Ernestokokenia faunas and the implications for the early Eocene of Patagonia, Argentina. Journal of Vertebrate Paleontology e1772801:1-21 [P. Mannion/P. Mannion]
57561 M. O. Woodburne, F. J. Goin, M. Bond, A. A. Carlini, J. N. Gelfo, G. M. López, A. Iglesias and A. N. Zimicz. 2014. Paleogene Land Mammal Faunas of South America; a Response to Global Climatic Changes and Indigenous Floral Diversity. Journal of Mammalian Evolution 21:1-73 [R. Butler/R. Butler]