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Closely related to intercalated contacts is interfingering (also known as intertonguing, [7] interdigitating, or interlocking [8]) of laterally adjacent sedimentary rock bodies. Here the contact breaks down into a series of wedges or tongues that penetrate the adjacent rock body and pinch out individually.
They also observe that there is evidence of diapirism (the intrusion of deformable Cleveland Shale upward into the more brittle Bedford Formation), as well as intertonguing. [57] Baird et al. note that the Cleveland Shale also tilts downward to the south. They suggest that this caused overstepping, rather than intertonguing. [7]
In geology, interbedding occurs when beds (layers of rock) of a particular lithology lie between or alternate with beds of a different lithology. [1] For example, sedimentary rocks may be interbedded if there were sea level variations in their sedimentary depositional environment .
"Intertonguing marine and nonmarine Upper Cretaceous deposits of New Mexico, Arizona, and southwestern Colorado". Geological Society of America Memoir. Geological Society of America Memoirs. 24: 1– 115. doi:10.1130/MEM24-p1. ISBN 9780813710242; Sears, J.D. (1925). "Geology and coal resources of the Gallup-Zuni basin, New Mexico".
The earliest references to strata now referred to as Jordan were made by many of the pioneering geologists of the upper Midwest. In an 1852 report on the geology of Wisconsin, Iowa, and Minnesota, D. D. Owen assigned it to the uppermost part of his “Lower Sandstone” (the “Upper Sandstone” referring to what is now called the St. Peter). [8]
Mancos Shale and Mowry Shale oil and gas fields within the Uinta Basin and Piceance Basin Mancos Shale badlands in Capitol Reef National Park, southern Utah.. The Mancos occurs in the Basin and Range Province, the Colorado Plateau Province, and the San Juan Mountains Province.
Cross-cutting relationships can be used to determine the relative ages of rock strata and other structures. Explanations: A – folded rock strata cut by a thrust fault; B – large intrusion (cutting through A); C – erosional angular unconformity (cutting off A & B) on which rock strata were deposited; D – volcanic dike (cutting through A, B & C); E – even younger rock strata (overlying ...
Batesville Sandstone; Stratigraphic range: Mississippian: Type: Formation: Sub-units: Hindsville Limestone Member: Underlies: Fayetteville Shale: Overlies: Ruddell ...