Where: Navajo County, Arizona (36.3° N, 109.8° W: paleocoordinates 39.5° N, 75.7° W)
• small collection-level geographic resolution
When: Watinoceras Ammonite zone, Mancos Shale Formation, Early/Lower Turonian (93.5 - 89.3 Ma)
• Bed horizon is the sample number not the lithologic unit number. The lithologic unit numbers that correspond to the sample numbers given can be found in reference for collection (Elder, 87).
• bed-level stratigraphic resolution
Environment/lithology: lithified, gray, silty, calcareous shale
Note: Section A5 constitutes interbedded limestones and shales, but this sedimentary structure is not reflected in the descriptions of each collection, as each is often a single bed, or a portion thereof.
Collection methods: bulk, mechanical,
• Bulk sample disaggregated in lab.
Primary reference: W. P. Elder. 1987. The paleoecology of the Cenomanian-Turonian (Cretaceous) stage boundary extinctions at Black Mesa, Arizona. Palaios 2(1):24-40 [C. Marshall/S. Low/A. Clement] more details
Purpose of describing collection: paleoecologic analysis
PaleoDB collection 3214: authorized by Charles Marshall, entered by Sofy Low on 27.07.1999