Arroyo Truquico, Agrio Formation, 120m (M1), Neuquen Basin (Cretaceous of Argentina)

Where: Argentina (37.4° S, 70.3° W)

• Paleocoordinates: 40.6° S, 29.3° W (Wright 2013)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Lower Member (Agrio Formation), Late/Upper Valanginian (140.2 - 136.4 Ma)

• = horizon M1

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified, shelly/skeletal limestone and lithified shale

• ' A transgressive phase started in mid-Valanginian time with the deposition of black shales and limestones of the Argio Fm.'

•'shoreface to offshore paleoenvironments on a storm-dominated, shallow marine ramp' (see PBDB coll. 50185)

• thin calcareous coquinas and shales

Size class: macrofossils

Primary reference: M. B. Aguirre-Urreta. 1998. The ammonites Karakaschiceras and Neohoploceras (Valanginian Neocomitidae) from the Neuquen Basin, West-Central Argentina. Journal of Paleontology 72:39-59 [M. Aberhan/S. Nurnberg]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 65435: authorized by Martin Aberhan, entered by Sabine Nürnberg on 22.09.2006

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Neocomitidae
Karakaschiceras attenuatus
Karakaschiceras attenuatus Behrendsen 1892 ammonite