The Geological History
The Arlington Archosaur Site lies within the Cretaceous (Cenomanian; 95 million years of age) rocks of the Woodbine Formation. The Woodbine Formation was mapped by R. T. Hill (often referred to as the "Father of Texas Geology") and named by Hill for the small Texas town of Woodbine in 1905. The Woodbine Formation preserves ancient coastal environments from a time of higher sea level than the present. A time in which what is now known as the Gulf of Mexico extended north through Texas and on northward, well into Canada. Many of the sediments from the Woodbine preserve either coastal, deltaic environments, or inland meandering rivers. The meandering river deposits typically preserve either the river channel, the floodplain, or oxbow lakes. The sediments range from sandstone to mudstone, clay and siltsone. The fossils from the Arlington Archosaur Site are found within the muds and clays of an ancient river system that advanced across the Texas coastal plain, spilling into the shallow waters of the Interior Seaway as a Mississippi style delta.
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