Field Notebook: Texas 1957a
Page 266
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Transcription
29) Calcarenite, orange-brown, organic frag.; very fine pebble size; crinoid stems, echinoid spines. 6". 30) Shale, medium gray-brown. 2.5'. 31) like the beds in #27 - crinoids and fusulines. 6"-1'. 32) Shale, dark gray, 16'. 33) Calcarenite (with high % of chert pebbles too) grading upwards through calcarenite to quartz sandstone with iron oxide cement. Weathers - Pale yellow-brown to a deep orange-brown at top. PG. 147 34) Sandstone, weathers light tan to buff. Grades into a siltstone and then into a shale. The fresher shale is dark gray. 9'. 35) Covered 12', probably mostly dark gray shale. 36) Shale, dark gray; and siltstone, weathers light yellow-brown. These two lithologies grade back and forth horizontally as well as vertically, 16'. Collection 8/1/57/6. 37) Calcarenite; dark gray (fetid); weathers a medium yellow-brown. Full of fusulines. Collection 6/24/57/7, 1.5'. Surface silicification of fossils; also the upper surface is flat, well sorted, laminar fine calcarenite with siliceous zones. 38) Siltstone, light yellow-brown weathering; with lenses of calcarenite; rather well sorted but not laminated. 9.5'. 39) Covered. 18'. Collection 8/1/57/5 from a poorly exposed bed in middle - like #40. PG. 148 40) Calcarenite, light gray-yellow, darker frags of fusulines, algal masses and other fossils. Irregular lenses of tan siltstone in various attitudes to bedding - 3'. 8/1/57/4. 41) Siltstone, finely laminated, yellow light brown weathering. Grades upward into dark gray shales; 29'. 42) Calcarenite; organic frag; brachs, bryozoans, crinoid stems; echinoid spines; fusulines. 1'. 7/26/58/7. 43) Shale and siltstone; some mudstone, weathers tan (light yellow-brown); dark gray on fresh surface. 42'. 44) Sandstone, light brown weathering, mud gray-brown on fresh surface. Has fossil frags in lower part very silty in upper part. 1'. 45) Shale and siltstones, light yellow-brown to medium gray weathering. In upper 2', lenses of organic fragmental limestone appear. 29'. PG. 149 46) edgewise conglomerate? Limestone, organic frag., medium gray weathering; tetracorals large crinoid stems, brachs, bryozoans. Bottom is irregular, seems to follow cut or eroded top of #45. The top of #46 is smoothly undulatory, siliceous upper 2". 8" to 1' (shows siltstone conglomerate toward drainage).