Page 11 - edwards1947

.9.

to suoh an extent that the mapping in these areas is of no

structural value. Bet,veen 2200 and 2400 feet of Rer.etto seem

to be represented on the well loge in the nel Valle area. Thia
1
oorr<le:pond.e ?"1 thar olossly to tbe 2150 feet reported by Tarbe,!/

in the same area. It should be note-e< here that Kew did not

recognize the Repetto in this area and assigned tbe whole

.i?liooene to the ~1oo formation (eee Correlation Table)•

There is one producing z:> ne in the Repetto, the Sepulveda

tone, which 1s considered to be 1n the lowermost i'l1ocene. It

is the highest 2D ~ strs tigra.µhioally in the Del Valle area•

Iico formation, u;ppr ilioeene t

The lower :eteo is exposed south of the Repetto on the Del

Valle thru.et sheet, south and weet of San Martinez Grande Can•

yon and on the Ramom anticline. It consists of a basal con-

glomerate overlain bJ gray-brown siltstone with local inter•

beie of buff to gray sandstone. Between the Del Valle and Ra•

mona :f'aulta the 1r-ioo exposed 1e ohief'l7 a sandstone unit with

so• of the lower :i-'ico 's siltstone outcropping also. Thie

sandst:>ne unit is approximately 2000 to 2300 feet thick and is

upper E'ico. The top of the ~. ieo as seen along Structure Seo•

t1on A•A' is a thin. very toeailiferoue ailte1tone, grading

into a sand.stone• :Beneath this are white to buff• creme sand•
stones, well•bedded, sorted and cemen 9.d• medium to coarse

grained.. Some 400 feet below the tor o:f the formation is an

'1. Tarbet;, 't. I., 2,l?.• ill•• P• 19d, rga.