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Tongoy area, Coquimbo Formation, Unit 4 (Miocene to of Chile)

Where: Chile (30.3° S, 71.5° W: paleocoordinates 30.7° S, 68.6° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Coquimbo Formation, Serravallian to Serravallian (13.7 - 7.2 Ma)

• Unit 4 has a mean age close to 11.2 Ma

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified, diatomaceous, tuffaceous claystone 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).
• tuffaceous and diatomaceous clay, lower flow regime planar laminae, siltstone, sandstone, phosphate pebble bed

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 68264: authorized by Martin Aberhan, entered by Sabine Nürnberg on 12.01.2007

Creative Commons license: CC BY (attribution)