C.A. Ross Collection /6683/ Under this number are samples from 43 measured sections and about 100 miscellaneous samples from the Pennsylvanian and lower Permian of the Marathon Basin and the Glass Mountains, Texas. Miscellaneous collecting localities are followed by the measured sections. COLLECTING LOCALITIES Localities in measured sections are indexed by two numbers separated by a hyphen i.e. 2-114. The first number (2) indicates the measured section, and the second (114) indicates the unit within that measured section from which its sample came. An additional letter may follow, i.e. 2-114A or 2-114B: A indicates that the sample is from a lower part of the particular unit than sample B and that sample B is from a lower part than is sample C. X is used for samples which were found loose in a particular interval and its exact stratigraphic cosition is less certainly known. These localities with their fauna are listed in the stratigraphic sections. Localities not in measured sections are indexed by single numbers and are listed below together with their fauna, geographic and stratigraphic position. 1. Haymond formation, 1.3 miles SW of Gap Tank, upper limestone and shale along old road cut; Fusulina attenuata. 2. Gaptank formation, 4.1 miles west of Marathon, just south of Highway 90, float near center of syncline; Triticites ventricosus. 3. Gaptank formation, 4.1 miles west of Marathon, just south of Highway 90, sandstone in flanks of syncline; Triticites comptus. [cont. in back of book] 130 pages