Page 4 - flint1939

ABSTRACT

Included in the tract studied are four sedimentary form-

ations and the recent a.lluvitm1. These formations are in the

order of thei:r deposition: the Mint Canyon, the :Modelo, the

Saugus, and the old alluvium or terrace deposits. The Mint

Canyon and the 2augus formations are both of terrestrial origin;

the Modelo is of marine. The area is of especial interest be-

cause each of the beds rests unconformably on the next under

it, and beo.;mse the boundary of the basin of deposition is

included in its extent .. This evidences itself with the thin-

ning of the Modelo and the ove rlal')ping of the Saugus onto the

Mint 8anyon. There has aleo been deformation and minor fault-

ing, especially in the northern portion.