Field Notebook: Texas 1957a
Page 158
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Transcription
148 40) Calcarente, light gray yellow, darkgraying juralines, algal mounds and other fossils. irregular lenses of tan siltstone in various attitudes to bedding - 3' 8/11/57/4 41) Siltstone, finely laminated, yellowbrown light weathering. Grades upward into dark gray shales; 29' 42) Calcarente, organic frag.; brachs, trygrams, crudidstone; echinod spines; juralines. 1' 7/26/58/7 43) Shale and siltstone; some mudstone, (light) weathering (dark yellow brown); dark gray on fresh exposures. 42' 44) Sandstone, light brown weathering, rust graybrown on fresh surface. Has fossil folds, in honeyard, very silty in upper foot. 1' 45) Shale and siltstone, light yellow-brown to mid gray weathering. In upper 2' fth., lenses of organic fragmented ls appears. 29' 149 46) LS, organic frag.; mid gray weathering; tetracoral, large crinoid stems, brachs, trygrams. 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' (shave siltstone tongue toward drain 47) Sandstone, v.f. quartz, very silty; light graybrown weathering; no apparent bedding. irregular blotches of varying shades of colors. 0-1' 48) Siltstone, light gray brown weathering; Grades an irregular topy of #48, in some locations meets directly on #47. Fills the trough or ground evenly and within 1/2' feet is evenly bedded. 14' 50) Calcarente, v.f. grained; weather light bluish gray. Rich in brownish silt. Has a small- coiled cephalopod gamma, we had 38, sect 17. 21' (a unit like #51 between the 2 ls side of this unit) 50) Covered, 9', probably similar to #49 lt brown, sandstone very silty, poorly cemented. 51) Calcarente and chert-quartzite Conglo. with one or two siltstone beds. 8' light gray weathering except for chert+quartzite patches, some ls cobble and clay