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Geologic Study of Upper Cretaceous (Cenomanian) Buda Limestone in Northeast Texas with Analysis of some Regional Implications [email protected] F. Reaser (1), William C. Dawson (2)
Donald F. Reaser (1), William C. Dawson (2)
The top of the Buda Limestone, youngest unit of the Comanche Series (Cretaceous) in Texas, is a submarine discontinuity. In northeast Texas, the formation is absent by erosion or thinned to a few meters. Erosional remnants of Buda Limestone which crop out near Grapevine Lake in Denton County, consist of hard, 0.5-meter fossiliferous limestone containing a variety of mollusks including ammonites, bivalves, and gastropods as well as calcareous algae, bryozoans, corals, and echinoids. The upper part of the rock is marked by large (2.5 cm in diameter), thalassinoidean-type burrows that are filled with iron oxide "piped" downward from the superjacent Woodbine Sandstone. At some places near Bolo Point, the rock is bored by the bivalve Gastrochaena and encrusted by the hexacoral Orbicella=Montastrea. The Buda Limestone ranges from a glauconitic, mollusk-echinoderm biomicrite to a bryozoan-coral-bearing biomicrite.
The Buda Limestone was deposited on a shallow inner shelf in well oxygenated water. Buda samples from near Bolo Point have 180 values that range from -4.62 to -5.32%. (PDB) and 13C values that range from -1.32 to -1.79%. (PDB), both characteristic of typical Phanerozoic marine limestones. Tentative plate reconstructions suggest that the Buda Limestone was deposited 3° (330 km) south of its present latitude of 30°N.
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