Where: Argentina (47.4° S, 71.9° W: paleocoordinates 48.2° S, 66.2° 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 65182: authorized by Austin Hendy, entered by Austin Hendy on 19.09.2006
Creative Commons license: CC BY (attribution)
Taxonomic list
Rhynchonellata | |
Plicirhynchia plicigera Ihering 1897 | |
Terebratella patagonica Sowerby 1846
Iheringithyris ameghinoi Ihering 1903
Gmelinmagas plicata Marinelarena 1964 | |
Gastropoda | |
"Polinices chiloensis" = Neverita chiloensis
"Polinices chiloensis" = Neverita chiloensis Philippi 1887 moon snail | |
Proscaphella cossmanni Ihering 1907 volute | |
Struthiolarella ornata snail | |
"Ficus (Diconoficus) posadasensis" = Ficus posadasensis
"Ficus (Diconoficus) posadasensis" = Ficus posadasensis Chiesa et al. 1995 fig shell | |
Bivalvia | |
Chlamys cf. praenuncius Ihering 1897 scallop
Zygochlamys jorgensis Ihering 1907 scallop | |
Pinna robusta Chiesa et al. 1995 oyster | |
"Loxocardium puelchum" = Trachycardium puelchum
"Loxocardium puelchum" = Trachycardium puelchum Sowerby 1846 cockle | |
Panopea thomasi Ihering 1914 clam | |
Anthozoa | |
Flabellum sp. Lesson 1831 stony coral |