Field Notebook: Texas 1957a
Page 190
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Transcription
Collection 6/30/57/1- P.King's gray limestone (#2 bed) in creek floor. Covered below. 1) Limestone, gray weathering 6"-3' beds, most crinoidal fragments and some other organic fragmental matter. 31'. The upper portions of this unit have progressively large limestone boulders in them, most of the upper 6-7' is composed of limestone cobbles 3" in diameter in a limestone matrix. The upper most foot loses the large limestone cobbles - The few pebbles found on the upper bedding surface are about 1" in diameter. (6/30/57/1 is from the lower 3' of this unit). Collection 6/30/57/2 is from upper 3' of this unit. 2) 8' covered-probably gray shale. Collection 7/1/57/10. 3) Limestone, conglomerate. 1/2" to 2" diameter pebbles, well rounded, little if any chert pebbles - some crinoid stems, a productidae - brown-yellow weathering. Collection 6/30/57/3. 4'. PG. 30 4) Covered 7' black to bluish shale in lower part. 5) Limestone, conglomerate yellow-brown weathering, upper 1' is sandy and organic fragmental. Flat bedding plane on top. Bryozoans, fusulines, crinoids common on upper surface. Collection 6/30/57/4, 3.5 feet. 6) Covered, 44' one or two 4-6" brown weathering sandstones are probably interbedded in a shale (gray?). 7) Limestone, conglomerate and rubble at base grading upward into organic fragmental and finally a sand layer (well laminated) in the upper most 3-4". There is apparently a shale parting between the rubble-conglomerate portion and the organic fragmental-sand portion. Typical flat top bedding plane. (6 feet +- ?). PG. 31 {note: illustration: bed ?: covered bed 7: Collection 6/30/57/5 and 6/30/57/6 (shale parting) bed 8: 6/30/57/7 bed 9: 6/30/57/8 and 6/30/57/9 and 7/1/57/9} 8) 2' - of which the lower 1'8" is a rubble of crinoid parts - upper 3" fine grained, laminated sandstone (CaCO3 + much silicification) - a 1" shale parting separates this litho. 9) a.) shale grey-grading into crinoid coquina and 1" diameter pebble which forms a rubble 2.5'. b.) Repetitions of 9a 1.5' followed by shale parting 1". c.) Fine coquina grading upward into a coarse ss, laminated with flat upper surface 2'. PG. 32 10) Covered 30' - brown to gray shales probably 11) Limestone, orange-brown weathering - another cycle like unit 5 or 7. 4', Collection 6/30/57/10 in top portion of unit 11.