Pichaihue valley PHo13, 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 neuquensis subzone

• bed-level stratigraphic resolution

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

• shoreface to offshore paleoenvironments on a storm-dominated, shallow marine ramp (PBDB coll. 50185)
• greenish grey silty shales with scattered nodules. 4 thin, harder beds with rusty-weathering concretions and smaller nodules and shelly (oyster debris) siltstone. (26.4 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 61597: 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
Cephalopoda
 Ammonitida - Holcodiscidae
Holcoptychites magdalenae
Holcoptychites magdalenae Douvillé 1910 ammonite
Bivalvia
 Carditida - Crassatellidae
Ptychomya sp.