Page 23 - dort1948

Page 18

Most of the strata show small-scale orosa-bedd1ng to

an extreme degree. Anhedral to subhedral maeaea ot

g,-psum are very abundant in the finer-grained beds.

The Pico 1s a marine formation, numerow,

Lower Pliocene foaa1ls being found in other looal1t1es.

However. only 1n the railroad out at point Sec. 20 (50-18)

were any organio remain• found within the area mapped.

These were 1cat~ered fragments ot marine shells, with

very tew complete individuals obtainable.

The bottom of the Pioo strata is nowhere

visible within the area of the present mapping. It 1•

thought that the Pico beds unconf"ot'mably overlie the

Mint Ot:.tnyon formation, from evidence in exposures a

short distance beyond the eastern border, where the

9
intervening Modelo formation 1s seen to lens out. <

Along the northem walls or both Plaoerita

Canyon and Hidden Valley th• Pico-Saugus contact can

be traced without d1tf1oulty. It is an angular

unoontorm1ty. Figure 4 ahowa this unoonform.1:ty at the

point sec. 31 (30-12} on the north side of Plaoerlta

Canyon. This same contact o~n be seen. though not as
clearly. at one point on a hilltop 1n the northern area

of Pieo exposures.

(9 - R.H. Jahns, personal eo~mun1oat1on.