Calcareous, very fine to coarse grained, poorly sorted, soft to firm, sometimes friable or unconsolidated, alternating shales, siltstones, sandstones, and conglomerates. The sandstones are cemented with calcite, anhydrite, and occasionally silica and hematite. The conglomerates are clast supported in a sand matrix. Clasts are subangular to surrounded and include quartz, quartzite, chert, and occasional volcanic and limestone detritus. 503 - 1372 Same as above except the redbeds are generally better cemented, creating dense layers that are responsible for the strong amplitudes between 0.45 and 0.50 seconds on the seismic section.
Conglomerates have a red claystone matrix.
Calcareous, with crystalline calcite and anhydrite cement in microfractures, fine grained, poorly to moderatly sorted, friable to hard and tight, alternating shales, siltstones and sandstones that contain coarse fragments of quartz, quartzite, and limestone. Dark brown to gray, calcareous and siliceous, very fine grained, moderately well sorted, friable to hard, shales, siltstones and sandstones. 1883 - 1979 Gray, green, fine grained, well sorted, calcareous and siliceous, carbonaceous with disseminated pyrite, slightly friable, tight shales, and sandstones.