Page 19 - dort1948
P. 19
Page 14
It 1s though that these strata lie etrat1gt•aph1cally
above those seen on the southern side of Plum Oanyon.
About two hundred teet of Modelo rooks is
olearly demonstrable. A total ot three hundred feet
may be more accurate it the distances between outorops
and the lack of data on the attitude of the bedding are
taken into aooount. The contact with the overlying
Saugus strata is not clearly exposed at any locality
within the area, but can be interred within a tew teet
by changes in lithology. It is undoubtedly also an
angular unconformity, thus aooounting tor the thinning
ot the Modelo eastward and southward. These relations
are clearly shown in Section B-B of Plate III.
One highly fossiliferous bed ot hard brown
sandstone about a toot thiok was found in the Modelo
section south or Plum Canyon. Unfortunately. moat ot
the remains are ot worm tubes, or are too highly broken
to be readily identifiable. A tew fragments of shell
were also found on the detrital slopes directly opposite
on the northern side of the canyon. Suoh organisms as
could be 1dent1t1ed are listed in Appendix o.
The entire Modelo formation was deposited under
marine oond1t1ons, probably 1n a broad, shallow estuary
