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Rocky Mountain Cretaceous Stratigraphy and Regressive Sandstones
Because of economic and scientific interest, Cretaceous rocks in the Rocky Mountains have been studied for many years, and gradually the picture of their development has emerged. In broad outline it is a history of deposition, partly marine and partly nonmarine, that occurred in and near a geosyncline. Marine and nonmarine beds intertongue complexly due to repeated transgressions and regressions of the sea. To date major transgressive and regressive tongues have been recognized, correlated, and mapped regionally.
The next phase of Cretaceous study probably will be mapping of relatively minor geological events. Minor shoreline changes during regressions are recorded in the regressive sandstones, and modern examples are valuable models that aid in their interpretation. This is shown by the similarity between a modern regressive sand body in southern Mexico and the Pictured Cliffs, a Cretaceous regressive sandstone in the San Juan Basin, New Mexico.
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