Tongoy area, Coquimbo Formation, Unit 14 (Pleistocene of Chile)

Where: Chile (30.3° S, 71.5° W: paleocoordinates 30.4° S, 71.0° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Coquimbo Formation, Gelasian (2.6 - 1.8 Ma)

• the age of Unit 14 is dated at 2.2 Ma (6 meter from the top) and 1.8 Ma (uppermost meter)

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified sandstone and lithified siltstone

• The very fine grain size of this unit suggests a low-energy, relatively deep-water environment... considered to represent inner bay sediments in relatively deep water (100-140 m).
• sandstone, siltstone, shale, mudstone

Size class: macrofossils

Primary reference: J. P. Le Roux, D. M. Olivares, S. N. Nielsen, N. D. Smith, H. Middleton, J. Fenner, and S. E. Ishman. 2006. Bay sedimentation as controlled by regional crustal behaviour, local tectonics and eustatic sea-level changes: Coquimbo Formation (Miocene-Pliocene), Bay of Tongoy, central Chile. Sedimentary Geology 184:133-153 [M. Aberhan/S. Nurnberg]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 68322: authorized by Martin Aberhan, entered by Sabine N├╝rnberg on 16.01.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Thecostraca
 Balanomorpha - Balanidae
Balanus sp. Da Costa 1778 barnacle
Bivalvia
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
Gastropoda
 Sorbeoconcha - Turritellidae
Turritella sp. Lamarck 1799 turret shell