Where: Chubut, Argentina (42.5° S, 70.0° W: paleocoordinates 45.0° S, 60.0° W)
• coordinate stated in text
• outcrop-level geographic resolution
When: Early/Lower Eocene (55.8 - 48.6 Ma)
• middle Chubut River volcanic-pyroclastic complex.
•According to Carvalho et al. 2013:
•40Ar/39Ar analyses of single sanidine crystals from a volcanic ash bed located within the densely sampled portion of the section yielded an early Eocene age of 52.2 +- 0.22 Ma, further supported by the detection of two paleomagnetic reversals, and two other, low resolution Ar/Ar ages from the same section for the most recent synopsis, see Wilf et al., 2003, 2005; Wilf, 2012). From the combined evidence, 52.2 Ma is the best available working age for the entire flora.
Environment/lithology: crater lake; lithified tuff
Size class: macrofossils
Collection methods: Studied material comes from collections at the Museo Paleontológico Egidio Feruglio, Chubut, Argentina (MPEF-Pb); National Museum of Natural History, Smithsonian Institution, USA (USNM); Museo de Ciencias Naturales de La Plata, Buenos Aires, Argentina (LPPb); Fundación Miguel Lillo, Tucumán, Argentina (LilPb), and Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina (FCENCBPB).
Primary reference: C. C. Gonzalez, M. A. Gandolfo, M. C. Zamaloa, N. R. CÃºneo, P. Wilf and K. R. Johnson. 2007. Revision of the Proteaceae macrofossil record from Patagonia, Argentina. The Botanical Review 73(3):235-266 [C. Jaramillo/P. Santamarina] more details
Purpose of describing collection: paleoecologic analysis
PaleoDB collection 153415: authorized by Carlos Jaramillo, entered by Patricio Santamarina on 16.12.2013, edited by Carlos Jaramillo
Creative Commons license: CC BY (attribution)