Rincón del Buque (Miocene of Argentina)

Also known as Media Luna, Wreck Flat of Riggs, Smith's Rock Flat

Where: Santa Cruz, Argentina (50.8° S, 69.2° W: paleocoordinates 51.4° S, 63.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Santa Cruz Formation, Santacrucian (17.5 - 16.3 Ma)

• The assemblage is typical of the Early Miocene Santacrucian South American Land Mammal Age (Patterson and Pascual, 1972).

• formation-level stratigraphic resolution

Environment/lithology: fluvial-deltaic; tuff

• Tw: Reworked ash-fall materials mixed with other sediments and deposited in tide-influence settings with subsequent marine bioturbation, and in fluvial settings with sub-aereal exposure and pedogenetic pedogenetic modification

•T: Deposition of ash-fall in sub-aerial primary tuffs and subaqueous fluvial settings and subaqueous fluvial settings

•FA11: T facies represent event of ash-fall in sub-aerial and subaqueous settings in floodplain environments. Tw represent unconfined sheet-flood episodes that remobilized pyroclastic materials in floodplain environments. Subsequent pedogenesis

• Tw Very fine- to medium-grained reworked

•T Fine- to medium-grained primary tuffs

•Pyroclastic and volcaniclastic deposits of the floodplain (FA11): Broad sheets ofT and Tw facies with sharp nonerosional basal surfaces, ranging in thickness from 0.5 to 1.4 m and making up to ~13 km in lateral extension interbedded within FA10 deposits. Sporadic paleoedaphic features

Size classes: macrofossils, mesofossils

Primary reference: S. F. Vizcaíno, R. F. Kay, and M. S. Bargo. 2012. Background for a paleoecological study of the Santa Cruz Formation (late Early Miocene) on the Atlantic Coast of Patagonia. In S. F. Vizcaí­no, R. F. Kay, M. S. Bargo (eds.), Early Miocene Paleobiology in Patagonia: High-Latitude Paleocommunities of the Santa Cruz Formation 1-22 [J. Zijlstra/J. Zijlstra/J. Zijlstra]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 176571: authorized by Jelle Zijlstra, entered by Jelle Zijlstra on 17.02.2016, edited by Miranta Kouvari

Creative Commons license: CC BY (attribution)

Taxonomic list

 Gruiformes - Phorusrhacidae
Phorusrhacos longissimus Ameghino 1887 terror bird
 Sparassodonta - Hathlyacynidae
"Hathlyacynidae indet." = Hathlyacininae
"Hathlyacynidae indet." = Hathlyacininae Ameghino 1894 metatherian
 Paucituberculata - Palaeothentidae
Palaeothentes intermedius Ameghino 1887 marsupial
Palaeothentes minutus Ameghino 1887 marsupial
Palaeothentes lemoinei Ameghino 1887 marsupial
Palaeothentes cf. aratae Moreno 1882 marsupial
"Acdestis owenii" = Acdestis oweni Ameghino 1887 marsupial
Acdestis lemairei Bown and Fleagle 1993 marsupial
 Microbiotheria - Microbiotheriidae
Microbiotherium tehuelchum Ameghino 1887 marsupial
 Cingulata - Peltephilidae
Peltephilus sp. Ameghino 1887 edentate
 Cingulata - Propalaehoplophoridae
Propalaehoplophoridae indet. Ameghino 1891 edentate
Cochlops sp. Ameghino 1889 edentate
 Cingulata - Chlamyphoridae
Prozaedyus sp. Ameghino 1891 edentate
Proeutatus sp. Ameghino 1891 edentate
Stenotatus sp. Ameghino 1891 edentate
 Megatherioidea -
cf. Pelecyodon sp. Ameghino 1891 edentate
 Megatherioidea - Megalonychidae
cf. Hapalops sp. Ameghino 1887 edentate
 Panameriungulata - Proterotheriidae
Tetramerorhinus sp., "cf. Diadiaphorus sp." = Proterotherium
Tetramerorhinus sp. Ameghino 1894 placental
"cf. Diadiaphorus sp." = Proterotherium Ameghino 1883 placental
 Panameriungulata - Macraucheniidae
Theosodon sp. Ameghino 1887 placental
 Rodentia - Octodontidae
Sciamys principalis Ameghino 1887 caviomorph
 Rodentia -
Spaniomys sp. Ameghino 1877 caviomorph
Spaniomys riparius Ameghino 1887 caviomorph
Acarechimys minutus Patterson and Pascual 1967 caviomorph
(see also ref 72683) MPM-PV 15089 MPM-PV 15090 MPM-PV 17435 MPM-PV 17440
Acarechimys minutissimus Ameghino 1887 caviomorph
(see also ref 72683) MPM-PV 17429 MPM-PV 17441
 Rodentia - Acaremyidae
Acaremys sp. Ameghino 1887 caviomorph
 Rodentia -
"Eocardia" sp. Ameghino 1887 caviomorph
Neoreomys sp. Ameghino 1887 caviomorph
 Rodentia - Eocardiidae
Phanomys sp. Ameghino 1887 caviomorph
 Rodentia - Dinomyidae
cf. Scleromys sp. Ameghino 1887 caviomorph
 Rodentia - Neoepiblemidae
Perimys sp. Ameghino 1887 caviomorph
 Notoungulata - Hegetotheriidae
Hegetotherium sp. Ameghino 1887 notoungulate
 Notoungulata - Interatheriidae
Protypotherium sp. Ameghino 1882 notoungulate
Interatherium sp. Ameghino 1887 notoungulate
 Notoungulata - Toxodontidae
Adinotherium sp. Ameghino 1887 notoungulate
Nesodon sp. Owen 1846 notoungulate
 Notoungulata - Homalodotheriidae
Homalodotherium sp. Huxley 1870 notoungulate
 Astrapotheria - Astrapotheriidae
Astrapotherium sp. Burmeister 1879 placental