Punta Moreno Fm, Bed COM.64, Chicama Basin (Jurassic of Peru)

Where: Peru (7.6° S, 78.9° W: paleocoordinates 8.0° S, 45.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Upper Member (Punta Moreno Formation), Late/Upper Tithonian (150.8 - 145.0 Ma)

• The fauna is ascribed to the Alternans zone of the Andean biochronological standard, which is probably equivalent to the Microcanthum zone of Europe, of early Late Tithonian age.

• bed-level stratigraphic resolution

Environment/lithology: delta front; lithified siliciclastic sediments

• The Punta Moreno Fm. includes two members. The lower member (850m) is made up of thick conglomerates, greywackes and lithic sandtones, deposited on a proximal turbiditic fan or a slope apron by high-density turbidity currents. The upper member (900m) expresses an evolution toward a slope environment characterized by feeding-channels, olistoliths and sedimentary slidings.

Size class: macrofossils

Preservation: mold/impression

Collection methods: focus on ammonites

Primary reference: R. Enay, G. Barale, J. Jacay and E. Jaillard. 1996. Upper Tithonian Ammonites and Floras from the Chicama Basin, Northern Peruvian Andes. GeoResearch Forum 1-2:221-234 [M. Aberhan/S. Nurnberg/S. Nurnberg]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 37887: authorized by Martin Aberhan, entered by Sabine Nürnberg on 27.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Sorbeoconcha - Colombellinidae
Zittelia sp. Gemmelaro 1870 snail
Cephalopoda
 Ammonoidea -
 Ammonitida - Olcostephanidae
 Ammonitida - Himalayitidae
? Himalayites cf. egregius ammonite
?Himalayites nov. sp. cf. "H." egregius
Corongoceras cf. lotenoense Spath 1925 ammonite
Parodontoceras aff. pardoi ammonite
P. n. sp. aff. pardoi
Parodontoceras cf. calistoides Behrendsen 1891 ammonite
 Ammonitida - Ataxioceratidae
 Ammonitida - Neocomitidae