Pichaihue valley PHo26, Agrio Formation, Neuquén Basin, Neuquén (Cretaceous of Argentina)

Where: Argentina (37.7° S, 70.2° W: paleocoordinates 37.3° S, 34.1° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Pilmatué Member (Agrio Formation), Early/Lower Hauterivian (136.4 - 130.0 Ma)

• upper part of the lower member (Pilmatué) of the Agrio Formation; Holcoptychites neuquensis zone, Holcoptychites agrioensis subzone (last bed of H. agrioensis subzone; next bed PO1 is the first bed of Olcostephanus (O.) laticosta subzone)

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified siltstone

• shoreface to offshore paleoenvironments on a storm-dominated, shallow marine ramp (PBDB coll. 50185)
• siltstone, hard and rusty below, passing up into a softer, crumbly-weathering siltstone (0.7 m)

Size class: macrofossils

Primary reference: M. B. Aguirre-Urreta and P. F. Rawson. 2003. Lower Cretaceous ammonites from the Neuquén Basin, Argentina: the Hauterivian genus Holcoptychites. Cretaceous Research 24(5):589-613 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 61605: authorized by Wolfgang Kiessling, entered by Uta Merkel on 21.06.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Carditida - Astartidae
Eriphyla sp.
Eriphyla sp. Gabb 1864 clam
Cephalopoda
 Ammonitida - Holcodiscidae
Holcoptychites agrioensis
Holcoptychites agrioensis Weaver 1931 ammonite
 Nautilida - Nautilidae
Cymatoceras perstriatum