Tongoy area, Coquimbo Formation, Unit 15 (Pleistocene of Chile)

Where: Chile (30.3° S, 71.5° W: paleocoordinates 30.4° S, 71.2° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Coquimbo Formation, Calabrian (1.8 - 0.8 Ma)

• Unit 15 was Sr dated at 1.4 Ma

• group of beds-level stratigraphic resolution

Environment/lithology: shoreface; lithified conglomerate and lithified, calcareous conglomerate

• The coquina are interpreted as nearshore (upper shoreface) deposits because of their high fossil content. In the Tongoy paleobay, this facies represents shelly shoals and channels, but more distant from the river mouth than Units 8, 10 and 13.
• conglomerate, calcareous conglomerate, wellcemented massive coquina, sandstone, siltstone, 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 68323: authorized by Martin Aberhan, entered by Sabine Nürnberg on 16.01.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

 Balanomorpha - Balanidae
Balanus sp. Da Costa 1778 barnacle
Bivalvia indet. Linnaeus 1758 clam
Gastropoda indet. Cuvier 1795 snail
 Neogastropoda - Muricidae
Acanthina unicornis Bruguiére 1789 unicorn
 Sorbeoconcha - Turritellidae
Turritella sp. Lamarck 1799 turret shell