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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Biostratigraphy of the Ojinaga and San 
Carlos
Formations
Cretaceous of West Texas and Northeastern Chihuahua
Carlos Formations
Cretaceous of West Texas and Northeastern ChihuahuaBy
University of Texas, Ph.D. thesis, August, 1966
Upper Cretaceous rocks in west Texas and northeastern Chihuahua, Mexico,
have been divided into three formations, the Ojinaga Formation, the San A zonation based on morphologic changes in stratigraphically successive
Placenticeras samples is proposed in order to supplement the established Upper
Cretaceous collignonicerid zonation. The correlation coefficients of twenty -
six stratigraphically unrelated samples are statistically compared with an
established Placenticeras evolutionary sequence and time correlations are made
at the ninety percent probability level.
The results of the biostratigraphic analysis suggest that the Senonian strandline
in Presidio and Jeff Davis Counties, Texas, and northeastern Chihuahua
moved in a southeasterly direction during an extensive marine regression. End_of_Record - Last_Page 14--------
Carlos
Formation, and the Picacho Formation.