Page 7 - macneill1947

Soope of the report ,.

The present paper deals primarily with structure. A

study of the formations adjacent to the Santa Clara River was

undertaken in the hope that through detailed mapping, Mint

Canyon beds s:iuth of the Santa Clara Valley could be correlated

with some of those on the north side of the valley. This was

soon found to be impossible, due to (1) the general parallel-

ism of the strike of the strata with the course of the river

valley, (2) the lenticular nature of the Mint Canyon beds,

(3) scarcity of outcrops immediately adjacent to the valley.

During this early work, an hitherto unreported fossiliferous

formation was encountered, und the complexity of the structure

in the underlying formation became apparent. It was deemed

worth \vtl.ile to study and report these features.

Lists of fauna are included here. Tentative ages,

deduced from these lists, are assigned to certain formations.

Tuff beds in the Mint canyon formation serve efteotive-

ly as marker beds. They give some olues as to possible struc-

tural interpretations; but are lenticular and henoe must be

used with oauti on.

Twenty-four field days were devoted to mapping in an

area of approximately 11 square miles. The results of the in-

vestigation are here submitted in partial :t'u.lfiJJ11::mt of ths

requirement for the degree of Master of Science in Geology to

the California Institute of Technology, Pasadena, California,

1947 •

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