Page 8 - edwards1947

tbioknesa of Delmontian age bels is unce~·ta1n. Depending upon

the point used f'or the top of the Delmontian, between 1500

to 2200 feet of brown shales, sandstones, and conglomerates
2
are assigned to this etage • .:;

3
Tarbe,Y studied the upper 11 tholog1c member .of the Modelo

formation on the Temescal anticline, immediately west of the
area s tu.died• and found that 1 i "comprises about 1300 feet ot

interbedded gray and brown silty shale and. sandstone with lenti•

oula.r rusty brown pebble and cobble conglomerate. The lower

part ot this member varies t'rom well bedded and laminated brown

shale and gray sandetone w1 th a few ealcareous•oemented beds

to rather massive gray and brown silty shale and sandstone.

The upper part o:f' this member varies fJtom well bedded gra:, and

brown silty shale and gray sand.stone to nm.ss1ve gray and brown

sandy siltstone and gray sandstone. Very lenticular sandy

conglomerate strata are present throughout the member, bt..t

they are more numerous 1n the upper and middle parts. lent1•

oular oil saturation is present in the sandstone and eonglomer•

ate strata of this member on the muth flank of the 'l'emesoal

anticline. The lowermost 1)8rt of this lithologio member is ta

the Mohn1an paleontologic time stage, and the upper part 1a

in the Delmontian stage. as def1md by R. M. Kleinpell.•

Both the Mohnian and. Delmontian stage of the MOdelo oon-

a. Mitter, 1. E. and'. ,~;ra'fili, \']. t. • ~• cit.• P• 38, 1941.
3. Tarbet, L. A•, Geology ot Del Vane n'I!' F1e11, Los Angeles
County-, Cai 1fom1a, Ail'G :Bull. 26, pt. 1, P• 189, 1942.