Abstract
This paper is the result of a study of the geology and paleontology of an area in the business district of the city of Los Angeles, California. During the last two decades the rapid growth of the city has resulted in obscuring a large number of former surface exposures of the Tertiary formations, so that it seems advisable to put on record as soon as possible information obtainable now, but which might be unavailable later on. Fortunately for the geologist, building operations have now and then resulted in excavations revealing the underlying geologic structure and the fossil faunas more clearly than do the natural outcrops. In the area covered by this report many building excavations and street embankments were utilized in working out the geology, and at a few points rich molluscan faunas were made available to us by several collectors.
The area considered in . . .
