Wheelock Member of Cook Mountain Formation. Marly clay, some glauconitic calcareous ironstone, very abundant marine megafossils. Thickness about 70 feet. Lies above Stone City Formation and below Landrum Member of Cook Mountain. Age is Eocene.
Not separately mapped. (Cook Mountain [undivided] mapped in southeastern corner of map sheet in Madison and Leon Cos., eastern TX.)
Source: Publication.
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