Aisol Hill (Lower Section) (Miocene of Argentina)

Where: Mendoza, Argentina (35.0° S, 68.5° W: paleocoordinates 35.4° S, 64.7° W)

• coordinate estimated from map

When: Aisol Formation, Middle Miocene (16.0 - 11.6 Ma)

Environment/lithology: terrestrial; sandstone

• The lower section (LS) of the profile is composed mainly of medium to fine-grained sandstones predominantly grey, reddish, yellow, and less frequently pale green; the entire bed is roughly sub-horizontal. The sandstones are calcite-cemented and the entire bed has strong cross- stratification (Fig. 2), with higher angles towards the middle and upper parts of the section. Between the sandstones, levels of reddish to brownish, fine siltstones are interbedded. The thickness of the siltstone levels is larger towards the lower part of the section. In contrast, towards the upper part, reddish to greenish siltstones intraclasts are frequently found within the sandstones (Fig. 2). The intraclasts are variable in size and their surfaces are mostly rounded. Fossil wood and vertebrate remains are common in different parts of the LS. With the exception of the bones found in the siltstone, other material is highly eroded, showing signals of transportation and corrosion of biological organisms. In the area of the profile, the LS is approximately 15 m thick. The base, however, was not observed; it is covered by recent deposits.

Size class: macrofossils

Collection methods: Museo de Historia Natural de San Rafael, Mendoza, Argentina

Primary reference: A. M. Forasiepi, A. G. Martinelli, M. S. Fuente, S. Dieguez, and M. Bond. 2011. Paleontology and stratigraphy of the Aisol Formation (Neogene), San Rafael, Mendoza. Cenozoic Geology of the Central Andes of Argentina 135-154 [E. Vlachos/E. Vlachos]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 189521: authorized by Evangelos Vlachos, entered by Evangelos Vlachos on 25.10.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Propaleohoplophorinae indet.
MACN- PV18608, fifteen isolated scutes from different individuals and MACN-PV18612, one isolated plate
Mammalia
 Xenarthra - Megatheriidae
Planopinae indet. Ameghino 1887 edentate
MACN-PV18611, right astragalus
 Ungulata - Macraucheniidae
cf. Theosodon sp. Ameghino 1887 eutherian
isolated cervical vertebra (MACN-PV18607) and dorsal verte- bra and portions of a metapod (MACN-PV18610)