Page 5 - macneill1947

one of late youth to early maturity; with maximum relief in

the mapped area of about 1000 feet.

INTRODUCTION

Previous Work

The first description of the oldest formation ex11osed

in the Humphreys Station area was published in i902. In that

year u.H. Hershey (1) gave the name ''Mellenia Series" to beds

which were later called by Kew ( see below) , the "Mint Canyon"

Series.

In 1901•2 G.H. El ridge ( 2) of the t;'nited States

Geological Survey, made a survey of the Santa Clara River Valley

in Los Angeles and Ventura Counties, and later a detailed map

of the region was published.

A report and map by w.s.w. Kew (3) of the United States

Geological Survey was published in 1924. This embodied the

results of a survey of the geology and oil resources of a part

of Los .Angeles and Ventura Counties; and is still widely used

as a general reference.

A study of the Vertebrate fauna in the Mint Canyon

beds, made by J.H. Maxson (4) was published in 1930. He

assigned the series an Upper Miocene age. Some of the ident-

ifications and interpretations put fortll there were criticized

by R.A. Stirton {5), in a paper published in 1933. Stirton

advocated a Lower ~liooene age for the strata.

R.H. Jahns (6) in 1939, gave a description of the strati-

graphy in the Easternmost Ventura .Basin; and continued the work