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

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Cephalopoda
 Ammonoidea -
Ammonoidea indet.
 Ammonitida - Olcostephanidae
Proniceras aff. toucasi
 Ammonitida - Ataxioceratidae
Moravisphinctes sp.
 Ammonitida - Neocomitidae
"Berriasella" cf. bardensis, "Berriasella" gerthi
 Ammonitida - Himalayitidae
? Durangites cf. limensis, Corongoceras cf. lotenoense, Micracanthoceras sp., ? Protacanthodiscus cf. quadripartitus, Parodontoceras aff. tenerum, Parodontoceras cf. beneckei, Parodontoceras angasmarcaense, Parodontoceras aff. pardoi, Parodontoceras cf. calistoides, ? Himalayites cf. egregius
Corongoceras cf. lotenoense Spath 1925 ammonite
Parodontoceras aff. pardoi ammonite
P. n. sp. aff. pardoi
Parodontoceras cf. calistoides Behrendsen 1891 ammonite
? Himalayites cf. egregius ammonite
?Himalayites nov. sp. cf. "H." egregius
Gastropoda
 Sorbeoconcha - Colombellinidae
Zittelia sp.
Zittelia sp. Gemmelaro 1870 snail