Page 18 - flint1939

13.

sediTents become a lighter br-wn and white (a yellow-white as

op~osed to the grey-white of the Mint Canyon). The Modelo is

arkosic, predominately coarse grained sandstones with some

sandy shales and the basal c~nglomerate. It may be distinguish-

ed in scattered outcrops by shell fragments, particles of car-

bonized wood, gypsum encased pebbles, and the existence of any

lime, other than caliche. As a rule the Modelo is quite well

lithified and is much more resistant toerosion than the ~int

Canyon.

A pecten of indistinguishable species was found at the

spot marked F2 on the map anda large collection of marine fos-

sils was collected in Plum Canyon at the spot marked F3. The

existence of Modelo at F4 was proven by the finding of a piece

of limestone in the ark•se that may represent a relict algal

reef or thick, fractured shell (specimen P.C. 12). The fossils

have not yet been classified though they contain specimens of

two types of Gastropods, worm borings and a mollusk of unknown
' .
superfamily (P.C. suite).

SAUGUS

The Saugus formation is the name given by Kew to extensive

landAmarine laid deposits of upper Pliocene and lower Pleisto -

cene time. _The'e deposits are exposed very well in Soledad

Canyon near the town of Saugus. In this areathe Saugus is

limited to about 200 feet of coarsely sorted gravels and sands

which_ are slightly lithified. They occur along the crest of