Field Notebook: Texas 1957b
Page 105
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Transcription
Sect. 34 see also p.99 of BK.1. Sect. 14b - 1/4 mile east of Sect. 14, measured up a set of 3 massive limestones at the entrance to the west canyon near Brooks Ranch House. Dip is 12° to N20°E. (Top down) 16) Conglomerate limestone cobbles of various shades, mostly dark gray, 3” diameter. 7'. (overlying this is a siltstone, dolomitic limestone, sandstone sequence of the “upper Wolfcamp” it is apparently slightly more limy than the section to the east or west. 15) Limestone, light gray, in uneven beds 6” to 1' fusulinids common. Collection 9/4/58/1, large Triticites very fine clastic matrix (calcarudite) 24'. PG. 164 Sect. 34 14) marl, light green-gray, sandy, little or no bedding a few scattered fusulinids; 4'. 13) Shale, reddish-brown, very silty, and thin algal limestone (8” or less) 28'. 12) Limestone medium gray, medium grained calcarenite of fossil frags, bedding indistinct, many uneven solution pseudobedding however. Weathers to a shape pitted surface near top, lower bed 90% or more crinoid frags. 22'. 11) Limestone, much like that above except in beds 4”-8”, this apparent permits easier erosion and a break in slope a this interval. 8'. 10) Limestone, light gray, massive beds 2'-6', a calcaludite matrix with large intact crinoid stem pieces. 21'. 9) Covered, probably a rumbly zone of limestone. 26'. 8) Limestone, light gray, calcaludite with some small fossil frags. 5'. PG. 165 Sect. 34 7) Covered stream gully, probably a marly interval - 12'. - limestone - bed 6 of Sect. 14. These upper limestone occupy a syncline in the lower limestone. The “Hess” conglomerate thickens to the west but the total effect suggests an over lap of these limestone beds towards the west and apparently also towards the east (the erosion by preHess conglomerate is however more severe eastward). The “Hess” conglomerate probably still thins over these beds because of a former topographic high. The Leonard forms a monotonous sequence of massive dolostones in its upper portion on the Brooks Ranch. At all places I took dip and strike along C. Brook's northern cross-canyon the strike was with in 5° of being east west. The dips become gentler to the west of his N-S main high country road and suggest a