Cruz de Piedra, Lo Valdés Fm, lower part of Siltstone member (Jurassic to of Chile)

Where: Chile (33.3° S, 69.9° W: paleocoordinates 31.8° S, 33.3° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Berriasella jacobi ammonoid zone, Siltstone Member (Lo Valdés Formation), Late/Upper Tithonian to Late/Upper Tithonian (150.8 - 140.2 Ma)

• early? Tithonian to Hauterivian

Environment/lithology: offshore shelf; calcareous siltstone

• Lo Valdés Formation consists of a 750 m thick sequence of limestone, calcareous siltstone and calcareous sandstones, conglomerates and breccias as well as >600 m of andesite in the lower part of the section. Biro (1964) divided the formation in three members which are predominantly volcanic (silite member, at base unit), siliciclastic (sandstone member, middle part of unit) and calcareous (calcareous member, at top of unit).
• siltstone, calcareous siltstone, silty limestone

•and andesite

Size classes: macrofossils, mesofossils

Primary reference: C. A. Salazar Soto. 2012. The Jurassic-Cretaceous Boundary (Tithonian - Hauterivian) in the Andean Basin of Central Chile: Ammonites, Bio- and Sequence Stratigraphy and Palaeobiogeography. [W. Kiessling/M. Krause]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 151660: authorized by Wolfgang Kiessling, entered by Mihaela Krause on 09.10.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Himalayitidae
Corongoceras cf. koellikeri, Corongoceras mendozanum, Micracanthoceras spinulosum, Micracanthoceras microcanthum
Corongoceras mendozanum Behrendsen 1892 ammonite
Micracanthoceras spinulosum Gerth 1925 ammonite
Micracanthoceras microcanthum Oppel 1865 ammonite
 Ammonitida - Neocomitidae
Substeueroceras calistoide