Guillermo Davilo (Cretaceous of Peru)

Also known as Rio Pachitea

Where: Peru (10.0° S, 74.9° W: paleocoordinates 14.2° S, 53.5° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Vivian Formation, Santonian (86.3 - 83.6 Ma)

Environment/lithology: deltaic; lithified, massive, fine-grained, coarse, brown, yellow sandstone and lithified, massive, coarse-grained sandstone

• "Could be either a fluvially influenced estuary or prograding delta front."
• "Kummel (1948) describes the Vivian Formation as containing two distinct lithofacies. The upper member is 80 m thick, and is comprised of yellowish-brown to white, massive, coarse to fine-grained sandstones with black partings, and interbedded black silty shale beds some of which are two meters thick. The lower member is 140 m thick, and is composed of massive, coarse, cross-bedded sandstones, with interbedded black shale beds, and prominent ironstone concretions. Lateral lithofacies changes, from sandstones to black shales, occur east to west. Vivian outcrops strike north-south, parallel to the north-south axes of regional eastern Andean ant- and synclinal fold belts."

•It is not known in which facies the fossils were found.

Size class: macrofossils

• "A single anterior cervical vertebra"

Collected by geologists working for the Socony Vacuum Oil Company in Peru; reposited in the MCZ

Primary reference: M. W. Caldwell and G. L. Bell, Jr. 1995. Halisaurus sp. (Mosasauridae) from the Upper Cretaceous (Santonian) of east-central Peru, and the taxonomic utility of mosasaur cervical vertebrae. Journal of Vertebrate Paleontology 15(3):532-544 [M. Carrano/H. Street]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 98018: authorized by Matthew Carrano, entered by Hallie Street on 16.09.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

 Squamata - Mosasauridae
Halisaurus sp. Marsh 1869 mosasaur
MCZ 2607