Lo Valdés Formation, Rio Volcán, Santiago Province, Units IV-VI (Cretaceous of Chile)

Where: Chile (33.8° S, 70.1° W: paleocoordinates 32.6° S, 33.5° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Units IV-VI Member (Lo Valdés Formation), Berriasian (145.0 - 139.8 Ma)

• Unit IV: 110 m.

•Unit V and VI: 100 m.

• group of beds-level stratigraphic resolution

Environment/lithology: offshore ramp; lithified, shelly/skeletal wackestone and lithified shale

• Characteristic of oxygen-deficient, quiet-water environments and represents deeper-water facies than the Tithonian and Upper Valanginian parts which are shallow neritic; shallow back-arc basin.
• Organic-rich partly laminated microsparite limestones and shales.

Size class: macrofossils

Primary reference: A. Hallam, L. Biró-Bagóczky, and E. Perez. 1986. Facies analysis of the Lo Valdés Formation (Tithonian-Hauterivian) of the High Cordillera of Central Chile, and the palaeogeographic evolution of the Andean Basin. Geological Magazine 123(4):425-435 [M. Aberhan/S. Nurnberg/S. Nurnberg]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 57145: authorized by Martin Aberhan, entered by Sabine Nürnberg on 06.12.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Arcida - Cucullaeidae
 Myalinida - Inoceramidae
Inoceramus sp. Sowerby 1814 clam
 Pectinida - Limidae
Pseudolimea sp. Douglas and Arkell 1932 file clam
Plagiostoma sp. Sowerby 1814 file clam
 Ostreida - Gryphaeidae
Gryphaea cf. balli Stefanini 1925 oyster
 Ostreida - Ostreidae
 Ostreida - Malleidae
 Ostreida - Bakevelliidae
 Ostreida - Pinnidae
Pinna cf. robinaldina d'Orbigny 1860 oyster
 Mytilida - Mytilidae
Modiolus sp. Lamarck 1801 mussel
 Carditida - Astartidae
Eriphyla argentina Burckh and Weaver 1907 clam
 Carditida - Crassatellidae
 Cardiida - Kalenteridae
 Cardiida - Arcticidae
""Cyprina" argentina" = Arctica
""Cyprina" argentina" = Arctica clam
 Cardiida - Glossidae
""Isocardia" koeneni" = Glossus
""Isocardia" koeneni" = Glossus clam
 Hiatellida - Hiatellidae
"Panopaea dupinian" = Panopea
"Panopaea dupinian" = Panopea clam
 Pholadomyida -
 Pholadomyida - Pholadomyidae
Pholadomya sanctacrucis clam
P. sancta-crucis
Pholadomya gigantea Sowerby 1836 clam
 Lucinida - Lucinidae
 Trigoniida - Megatrigonioidae
 Nuculida - Nuculidae
Nucula sp. Lamarck 1799 nut clam