Where: Neuquén, Argentina (39.0° S, 68.2° W: paleocoordinates 43.5° S, 49.2° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Bajo de la Carpa Formation (Neuquén Group), Santonian (85.8 - 83.5 Ma)
• Rio Colorado Subgroup
• group of beds-level stratigraphic resolution
Environment/lithology: fluvial-deltaic; poorly lithified, fine-grained, medium, red, white sandstone
Size classes: macrofossils, mesofossils
Collected by O. de Ferrariis, J. O. Calvo in 1984-1987
Collection methods: quarrying, mechanical,
• Chiappe (1991) notes that "The Bajo de la Carpa Member yielded several other remains of continental vertebrates such as notosuchian crocodiles, dynilisid ophidians, and small theropod dinosaurs (Bonaparte, 1987)". Alvarezsaurus found by J. Calvo in May 1987.
•Chiappe (1991) also notes that the collection includes a nearly complete skeleton and partial skeleton of a then unpublished cursorial flightless bird (later named Patagopteryx deferrariisi by Alvarenga and Bonaparte, 1992) and a complete, articulated skeleton of a then unpublished enantiornithine bird (later named Neuquenornis volans by Chiappe and Calvo, 1994).
Primary reference: L. M. Chiappe. 1991. Cretaceous birds of Latin America. Cretaceous Research 12(1):55-63 [J. Hunter/J. Hunter/J. Hunter] more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 13305: authorized by John Hunter, entered by John Hunter on 20.02.2002, edited by Matt Carrano