Where: Argentina (46.9° S, 70.9° W: paleocoordinates 47.6° S, 65.2° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: El Chacay Formation, Burdigalian (20.4 - 16.0 Ma)
• STRATIGRAPHIC RELATIONS: From El Chacay Fm, which regionally overlies Basalto Posadas and is overlain by the Santa Cruz Fm (Eocene-Oligocene). THICKNESS: AGE: Eocene. No further detail provided. Justified on the basis of stratigraphic position and biostratigraphic correlation. This unit has more recently been dated as early Miocene (Burdigalian) by Sr isotopes (Cuitiño et al., 2015) and correlative units also as Burdigalian by U-Pb chronology (Cuitiño et al., 2012). STRATIGRAPHIC POSITION: Unknown stratigraphic position within section. Figure 3 (Chiesa et al. 1995) suggests that the collection is derived from multiple distinct beds within the formation at each section.
• group of beds-level stratigraphic resolution
Environment/lithology: marine; lithified sandstone and lithified, shelly/skeletal, sandy mixed carbonate-siliciclastic
Size class: macrofossils
Collection methods: quarrying,
• COLLECTORS: Presumably collected by authors during broader lithostratigraphic study and geologic mapping (see Chiesa and Camacho, 1995). REPOSITORY: CIRGEO (Centro de Investigaciones en Recursos Geologicos), Argentina.
Primary reference: J.O. Chiesa, S.G. Parma, and H.H. Camacho. 1995. Observaciones estratigraficas en el Paleogeno del noroeste de la Provincia de Santa Cruz (Republica Argentina). Parte II: Invertebrados marinos de la Formacion El Chacy (Eoceno), Provincia de Santa Cruz, Argentina. Systematica y bioestratigrafia. Monografias de la Acadamia Nacional de Ciencias Exactas, Fisicas Y Naturales 11:17-68 [A. Hendy/A. Hendy]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 65177: authorized by Austin Hendy, entered by Austin Hendy on 19.09.2006
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Epitonium rugolosa wentletrap | |
Calyptraea juliana slipper shell | |
Struthiolarella ornata snail | |
Proscaphella santacrucensis Chiesa et al. 1995 volute | |
"Ficus (Diconoficus) posadasensis" = Ficus posadasensis
"Ficus (Diconoficus) posadasensis" = Ficus posadasensis Chiesa et al. 1995 fig shell | |
Bivalvia | |
Anadara panensis Ihering 1914 ark | |
Isognomon sp. Lightfoot 1786 oyster | |
Venericardia sp. Lamarck 1801 clam | |
Rhynchonellata | |
Plicirhynchia plicigera Ihering 1897 | |
Gmelinmagas plicata Marinelarena 1964
Terebratella patagonica Sowerby 1846 | |
Echinoidea | |
Iheringiella patagonensis Desor 1847 sand dollar |