Field Notebook: Texas 1959
Page 33
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Transcription
2) Vidrio = Capitan upper member apparently and it seems likely that Altuda shale and lower member [of Capitanian] are equal to upper part of Word. [In 2004, I don't think this was correctly interpreted and need to study this part of the facies transistion much more thoroughly.] PG. 49 Section 5 Jail Canyon Section on East side of Old Blue Mt., Jail Canyon. Covered below 1) Limestone, medium gray, 2-4' beds, gastropods and crinoid columns, recrystallized; - ---15'. 2) Limestone, (buff) light brown weathering, 6"-1' beds, siliceous bands ---- - 85'. 3) Limestone, medium gray, pitted weathering, surface, 2-5' bed (similar to unit 1); calcarenite lenses (Coll 3A).----51'. 4) Ss., orange-brown to light brown, weathering, 2" to 6" beds, a lot of calcite cement, "siliceous bands are irregular throughout unit - 112'. 5) Limestone, medium gray, calcarenite - 2' to 6' beds, silicified and replaced fossils - Jail Canyon - Coll. 5A-about 3' up. Conglomeratic in part- calcarenite, very fine to 1"-2" pebbles - Calcirudite. [See King's Sect. 16, unit 5]. ------- ---------about 20' 6) Limestone, tan, calcirudite and ss., pinches out to South - varies from 10' here to 30-40' on ridge 400 yards North. PG. 50 7) Limestone, medium gray, 2'-3' beds, to top of Hill. His unit 3 is missing where we measured section but becomes thicker to southwest - His units 3 and 2 = upper part of his unit 1. {note: illustration followed}. [This is the area of the upper Word and lower Capitanian shelf break so facies and lithologies are changing abruptly.] PG. 51 [3 3/4 miles about N30°W of Skinner Ranch]. The Word limestone which King maps along the west side of Gilliland Canyon is probably his third limestone, not the first one. (Collection Iron Mt. road Word Limestone A) is from this - includes a few scattered fusulinids, cephalopods and a "scachinella" brachiopod. There seems to be no need for the fault further southwest. The top of the hill we climbed is a terrva block. The Gilliland Anticline poops out to the south of this point and beds regain their 10° NW dip. PG. 52 Blank PG. 53