Results: 1 - 6 of 6
Oct 31, 1993
Open File Report
… … The Jurassic/Cretaceous boundary in a … 1992-23. The report discusses Jurassic stratigraphy, the nature of the Jurassic/Cretaceous boundary and …
Dec 31, 1989
Open File Report
… supported study of the Jurassic-Lower Cretaceous boundary … the 'Niton B' unit - is of Upper Jurassic age and shallow - marine … part of the marine Middle Jurassic Rock Creek Member, this …
Dec 31, 1992
Open File Report
… of the Lower Cretaceous, Jurassic and Mississippian … one of the most problematic. The Jurassic units are unconformity … between the Cretaceous and Jurassic strata generally cannot be …
Dec 31, 1985
Open File Report
… Member, a widespread Middle Jurassic clastic unit in … dating of strata at the Jurassic-Lower Cretaceous boundary, … Losert, J. … Losert, J. (1986): Jurassic Rock Creek Member in the …
Sep 26, 2017
Open File Report
… zircon geochronology from Lower Jurassic to Lower Cretaceous strata … from at least the Early Jurassic, long before the … trough. Older grains in the Jurassic strata reflect the …
Jun 04, 2018
Open File Report
… from the following Devonian and Jurassic formations in central and … dating of selected Devonian and Jurassic core samples from central … Dating of Selected Devonian and Jurassic Core Samples from Central …