Where: Argentina (47.5° S, 71.8° W: paleocoordinates 48.3° S, 66.0° 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 65180: authorized by Austin Hendy, entered by Austin Hendy on 19.09.2006
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Epitonium rugulosa wentletrap | |
Struthiolarella ornata snail | |
"Ficus (Diconoficus) posadasensis" = Ficus posadasensis
"Ficus (Diconoficus) posadasensis" = Ficus posadasensis Chiesa et al. 1995 fig shell | |
Acteon bajoensis Chiesa et al. 1995 snail | |
Scaphopoda | |
Dentalium sp. Linnaeus 1758 tusk shell | |
Bivalvia | |
Panopea thomasi Ihering 1914 clam
Panopea ibari Philippi 1887 clam | |
Lahillia patagonica Ihering 1907 clam | |
Chlamys cf. praenuncius Ihering 1897 scallop | |
"Glycymeris (Glycymerita) camaronesia" = Glycymerita
"Glycymeris (Glycymerita) camaronesia" = Glycymerita clam | |
Rhynchonellata | |
Iheringithyris ameghinoi Ihering 1903
Terebratella patagonica Sowerby 1846
Gmelinmagas plicata Marinelarena 1964 | |
Plicirhynchia plicigera Ihering 1897 | |
Patagorhynchia patagonica Ihering 1903 | |
Echinoidea | |
Iheringiella patagonensis Desor 1847 sand dollar | |
"Platipygus posthumus" = Platypygus
"Platipygus posthumus" = Platypygus sea urchin |