https://www.usgs.gov/publications/assessment-continuous-oil-and-gas-resources-upper-cretaceous-niobrara-formation
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean continuous resources of 703...
oil and gasin theassessmentcontinuousresources
https://www.usgs.gov/publications/a-detailed-taxonomy-upper-cretaceous-and-lower-tertiary-crassatellidae-eastern-united
Current theories on the causes of extinction at the Cretaceous-Tertiary boundary have been based on previously published data; however, few workers have...
upper cretaceouslower tertiarydetailedtaxonomycrassatellidae