Where: Buenos Aires, Argentina (38.6° S, 58.8° W: paleocoordinates 38.6° S, 58.2° W)
• coordinate estimated from map
• small collection-level geographic resolution
When: Early/Lower Pleistocene (2.6 - 0.8 Ma)
• De Santi et al. 2021: Bidegain et al. (2005) provided a magnetostratigraphi- cal analysis of the Las Grutas and Punta Negra sites that outcrop in the Necochea area (Fig. 1A). These authors recognized up to five levels in the Las Grutas profile (LG5–LG1) with a normal geomagnetic polarity. LG5 is correlated with the Jaramillo subchron (C1r.1n, between 1.07 and 0.99 Ma), whereas LG4–LG1 are cor- related with the Brunhes chron (< 0.78Ma; Fig. 1B). The LG4 level was probably deposited during Oxygen Isotopic Stage (OIS) 11, around 0.45 Ma; on a biochronological criterion, this level is correlated with the Ctenomys kraglievichi Range Zone (Verzi et al. 2004).
• bed-level stratigraphic resolution
Environment/lithology: fluvial; silty sandstone
Size classes: macrofossils, mesofossils
Primary reference: N. A. De Santi, D. H. Verzi, A. I. Olivares, P. Piñero, A. and C. C. Morgan. 2021. A new Pleistocene Ctenomys and divergence dating of the hyperdiverse South American rodent family Ctenomyidae. Journal of Systematic Palaeontology 19(5):377-392 [P. Mannion/G. Varnham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 225537: authorized by Philip Mannion, entered by Grace Varnham on 16.05.2022, edited by Gavin Limroth
Creative Commons license: CC BY (attribution)
Taxonomic list
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Olympicomys vossi1 Pardiñas et al. 2002 rodent Paratype: MLP 91-IV-25-108, incomplete right hemimandible with ml-m3 and the intralveolar portion of the incisor; MLP 91-IV-25-80, fragment of right hemimandible with ml-m2; MLP 95-XII -1-20, fragment of left hemimandible with incomplete m2 and m3, collected in Punta Negra
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Ctenomys rusconii De Santi et al. 2021 caviomorph MLP 91-IV-25-95, MLP 91-IV-25-100, MLP 91-IV-25-101, MLP 91-IV-25-103, MLP 91-IV-25-210
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