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Stratigraphy and geologic history of the Montana group and equivalent rocks, Montana, Wyoming, and North and South Dakota
During Late Cretaceous time a broad north-trending epicon­ tinental sea covered much of the western interior of North America and extended from the Gulf of Mexico to the Arctic Ocean. The sea wasExpand
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Patterns and Timing of Synorogenic Sedimentation in Upper Cretaceous Rocks of Central and Northeast Utah
Abstract Patterns of sedimentation in central and northeast Utah along the western margin of the Late Cretaceous seaway were controlled by thrust-fold tectonic events in eastern and southern Nevada,Expand
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Stratigraphy and ammonite fauna of the Graneros Shale and Greenhorn Limestone near Pueblo, Colorado
__________________________.. Introduction ______________________________________ Acknowledgments _________________._____ Previous work _______________________________ StratigraphyExpand
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Stratigraphy of the Niobrara Formation at Pueblo, Colorado
Eight lithologlc units were mapped in the Niobrara Formation of Late Cretaceous age during a study of the engineering geology of the Northwest Pueblo quadrangle. The thin Fort Hays Limestone MemberExpand
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Ammonites from the Navesink Formation at Atlantic Highlands, New Jersey
Only a few species of ammonites have been recorded from the Upper Cretaceous Navesink .Formation. An active group of amateur collectors has recently obtained many ammonite specimens from the basalExpand
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Stratigraphy and composition of the Sharon Springs Member of the Pierre Shale in western Kansas
............................................ Introduction...................................... Acknowledgments............................. Historical background..................... GeologicExpand
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The Late Cretaceous ammonites Scaphites leei Reeside and Scaphites hippocrepis (DeKay) in the western interior of the United States
_________________________ Introduction_____________________ Geographic distribution.-_.________ Sequence of fossils_________________ Dimorphism in ammonites._________ Ammonites other than scaphites_Expand
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