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it disrupts existing time zones leas, and agrees with

known taots better it the Mint Canyon is considered to

be ot middle Upper ~iocene age, and the Modelo uppermost

Uiooene in age. (B

Pioo Formation

In the oentral part of the area, the Soledad

anticline exposes beds of the Pico formation within a

small area immediately south of Soledad O~nyon. P1oo

strata also are visible 1n narrow belts along the bottoms

ot Plaoerita Canyon and Hidden Valley.

The Pioo str~ta vary in lithology from ooarse

conglomerates to fine-grained sandstones and ailtstones.

The beds are commonly light to medium brown, and are

oharaoterized by limonitio stains as well as by

concretions and ve1nlets of iron oxide. Yellow sands

and thinly well-bedded gray siltstones also are present.

(8 - O.H. Hershey, Univ. Calif. Pub., Bull. Dept.
Oeol., Vol. 5, No. 1, pp 1-30, 1902-04.
P.S. Hudson a.nd E.K. Craig, Bull. A.A.P.G., Vol. XIII,
pp 509-518, 1929.
J.B. Maxson, Carnegie Inst. or Wash., Pub. No. 404,
Paper VII, pp 79-112, 1930.
R.A. Stirton, AM. Jour. Sol., Vol. 26, pp 569-576, 1933.
R.A. Stirton, Am. Jour. Soi., Vol. 32, pp 161-206, 1936.
T. Clements, Bull. A.A.P.G., Vol. XXI, pp 212-232, 1937.
P.O. MoGrew and o.E. Meade, Am. Jour. Soi., Vol. 36,
pp 197-207, 1938.
G.E. Lewis, Am. Jour. Soi., Vol. 26, pp 208-211, 1958.
J.H. Maxson, Bull. A.i.P.G., Vol. XXII, pp 1718-1.,17, 19~2,
J.H. Maxson, Bull. o.s.A., Vol. 49, pp 1910-1917, 1958.
J.E. Eaton, Bull. ~.A.P.G., Vol. XXIII, pp 517-558, 1939,
R.H. Jahns, op. cit.