Ogallala Formation

Ogallala Formation - Interpretation of Ogallala Formation...

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Interpretation of Ogallala Formation The Ogallala Formation, exposed in State Park, TX, unconformably overlies the Triassic Dockum Group and is capped by the Blackwater Draw Formation. It consists of four units; calcic conglomerate, calcic sandstone, calcic silty sand, and caliche. These four units can be grouped together into two units, based on their depositional environment and paleoenvironment. The lower unit is a basal calcic conglomerate consisting of reworked fossiliferous limestone and reworked quartz, hematite cemented quartz sandstone, chert, and microcline. The sequence fines upward into a cross laminated calcic sandstone that contains calcium carbonate cemented quartz, chert, and microcline grains. A portion of the quartz grains in both sections is metamorphic quartz. The reworked grains were stripped from Cretaceous and Permian strata (Gustavson and Winkler 1988). The metamorphic grains are related to an orogenic event. Gustavson and Winkler (1988) relate the unit to both stripping
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Ogallala Formation - Interpretation of Ogallala Formation...

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