Chinches bearing level (Miocene of Argentina)

Also known as CBL

Where: San Juan, Argentina (32.0° S, 69.7° W: paleocoordinates 32.6° S, 65.2° W)

• coordinate stated in text

• small collection-level geographic resolution

When: TC2 Member (Chinches Formation), Santacrucian (17.5 - 16.3 Ma)

• This is a level coming from the lowest third of the Chinches Formation

•(Manantiales basin).

•The Tertiary sequences in the Manantiales basin represented by the Chinches Formation, have been divided into seven members (TC0 to TC6), and their integration allowed a reconstruction of the development over the whole Manantiales basin (Pérez 2001a) (Fig. 2).

•The Chinches bearing level corresponds to TC2.

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial; massive, lenticular, coarse-grained, conglomeratic sandstone

• These levels represent fluvial meandering environments whose energy diminishes upward in the section (Pérez 2001a).
• TC2 to TC4 are characterized by medium to coarse-grained, massive, parallel-stratified sandstones interfingered with lenticular conglomerates (Figs. 1b and 2). Clast composition mainly consists in rhyolites and volcanic breccia derived from the Choiyoi Group. Shales interfinger toward the top (TC4).

Size classes: macrofossils, mesofossils

Collected in 2005, 2007, 2008

Primary reference: G. M. López, M. G. Vucetich, A. A. Carlini, M. Bond, M. E. Pérez, M. R. Ciancio, D. J. Pérez, M. Arnal, and A. I. Olivares. 2011. New Miocene mammal assemblages from Neogene Manantiales basin, Cordillera Frontal, San Juan, Argentina. In J. A. Salfity, R. A. Marquillas (eds.), Cenozoic Geology of the Central Andes of Argentina 211-226 [P. Mannion/M. Kouvari]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 197899: authorized by Philip Mannion, entered by Miranta Kouvari on 28.11.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

• The main goal of this paper is to report these new mammal assemblages. Detailed anatomical and systematic studies of these mammals will be accomplished elsewhere.
Mammalia
 Panameriungulata - Macraucheniidae
Macraucheniidae indet. Ameghino 1889 placental
 Panameriungulata - Proterotheriidae
Proterotheriidae indet. Ameghino 1887 placental
 Rodentia - Dinomyidae
Scleromys "sp. nov.?" Ameghino 1887 caviomorph
 Rodentia -
Neoreomys cf. australis Ameghino 1887 caviomorph
 Megatherioidea - Megalonychidae
cf. Hapalops sp. Ameghino 1887 edentate
 Cingulata - Chlamyphoridae
Stenotatus sp. Ameghino 1891 edentate
 Cingulata - Peltephilidae
Peltephilus sp. Ameghino 1887 edentate
 Notoungulata - Hegetotheriidae
Hegetotherium cf. mirabile Ameghino 1887 notoungulate
 Notoungulata - Mesotheriidae
cf. Altitypotherium sp. Croft et al. 2004 notoungulate
 Notoungulata - Interatheriidae
Interatheriidae "gen. et sp. nov 1" Ameghino 1887 notoungulate
Protypotherium "sp. 1" Ameghino 1882 notoungulate
Protypotherium "sp. 2" Ameghino 1882 notoungulate