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The Trinity Group is a group (sequence of rock strata) in the Lower Cretaceous lithostratigraphy of Texas, Arkansas, Mississippi, Louisiana and Oklahoma. [2] [3] [4] It is named for the Trinity River of Texas. A stratigraphic column at the Mount Bonnell Fault location starts with the Lower Cretaceous Trinity Group overlain by the Edwards Group.
A stratigraphic column is a representation used in geology and its subfield of stratigraphy to describe the vertical location of rock units in a particular area. A typical stratigraphic column shows a sequence of sedimentary rocks , with the oldest rocks on the bottom and the youngest on top.
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Fredericksburg Group stratigraphic column in Texas The Fredericksburg Group is a geologic group in Texas , United States. It preserves fossils dating back to the Cretaceous period .
Edwards Group stratigraphic column in Texas. The Edwards Group is a geologic group in Texas.It preserves fossils dating back to the Cretaceous period.. A stratigraphic column at the Mount Bonnell Fault location starts with the Lower Cretaceous Trinity Group overlain by the Edwards Group.
Texas is approximately bisected by a series of faults that trend southwest to northeast across the state, from the area of Uvalde to Texarkana.South and east of these faults, the surface exposures consist mostly of Cenozoic sandstone and shale strata that grow progressively younger toward the coast, indicative of a regression that has continued from the late Mesozoic to the present.
Navarro Group stratigraphic column in Texas The Navarro Group is a geologic group in Arkansas , Texas and Coahuila , Mexico . It preserves fossils dating back to the Cretaceous period .
Trinity Group stratigraphic column in Texas. The Hensel Formation or Hensel Sand is a Mesozoic geologic formation in Texas. Fossil ornithopod tracks have been reported from the formation. [1] A stratigraphic column at the Mount Bonnell Fault location reveals the following sequence: the Lower Cretaceous Trinity Group is overlain by the Edwards ...