Geology of Muldoon area, Fayette County, Texas
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This paper presents a detailed geologic map of the Muldoon area, southwestern Fayette County, Texas. Strata outcropping in the area are the upper Yegua formation of the upper Claiborne group, the Caddell, Wellborn, Manning, and Whitsett formations of the Jackson group of the Eocene, and the Catahoula and lower Oakville formations of the Oligocene and Miocene. The stratigraphic section consists of approximately 900 feet of sediments and is a compilation of 27 individual surface exposures tied in stratigraphically. The regional dip in the area is to the southeast, varying from 68 feet per mile for the lower Oakville formation to 129 feet per mile for the Wellborn formation. Faulting in the area is restricted to minor normal faults with displacements up to 10 feet cutting the Carlos sandstone outcrop. The basal Caddell sands were analyzed in the laboratory to determine the size frequencies, heavy minerals, and glauconite content. A list of plants growing in the area is included. Both presence and importance of the species found on each formation is indicated by field-assigned numbers.