The Colorado River; a source of water and power for Los Angeles

The rapid growth and development of Los Angeles City and County has been one of the phenomena of the present age. The growth of a city from 50,600 to 576,000, an increase of over 1000% in thirty years is an unprecedented occurrence. It has given rise to a variety of problems of increasing magnitude.

Chief among these are: supply of food, water and shelter development of industry and markets, prevention and removal of downtown congestion and protection of life and property. These, of course, are the problems that any city must face. But in the case of a community which doubles its population every ten years, radical and heroic measures must often be taken.

Geology of the Pacoima Area, Los Angeles County, California

The Pacoima area is located on an isolated hill in the northeast section of the San Fernando, the northeast portion of the Pacoima Quadrangle, Los Angeles County, California. Within it are exposed more than 2300 feet of Tertiary rocks, which comprise three units of Middle Miocene (?) age, and approximately 950 feet of Jurassic (?) granite basement. The formations are characterized by their mode of occurrence, marine and terrestial origin, diverse lithology, and structural features.

The basement complex is composed of intrusive granite, small masses of granodiorite and a granodiorite gneiss with the development of schistosity in sections. During the long period of erosion of the metamorphics, the granitic rocks were exposed and may have provided clastic constituents for the overlying formations.

As a result of rapid sedimentation in a transitional environment, the Middle Miocene Twin Peaks formation was laid down unconformably on the granite. This formation is essentially a large thinning bed of gray to buff pebble and cobble conglomerate grading to coarse yellow sandstone. The contact of conglomerate and granite is characterized by its faulted and depositional nature.

Beds of extrusive andesite, basalt porphyry, compact vesicular amygdaloidal basalts, andesite breccia, interbedded feldspathic sands and clays of terrestial origin, and mudflow breccia comprise the Pacoima formation which overlies the Twin Peaks formation unconformably. A transgressing shallow sea accompanied settling of the region and initiated deposition of fine clastic sediments.

The marine Topanga (?) formation is composed of brown to gray coarse sandstone grading into interbedded buff sandstones and gray shales. Intrusions of rhyolitedacite and ash beds mark continued but sporatic volcanism during this period.

The area mapped represents an arch in the Tertiary sediments. Forces that produced the uplift of the granite structural high created stresses that were relieved by jointing and faulting. Vertical and horizontal movement along these faults has displaced beds, offset contacts and complicated their structure. Uplift and erosion have exposed the present sequence of beds which dip gently to the northeast. The isolated hill is believed to be in an early stage of maturity.

Study of the problem of the Los Angeles sewage disposal

No abstract.

Special Sewage Problem : Report on the Sewage Problem of the City of Los Angeles with Conclusions and Recommendations

Not available.

Los Angeles [le bâtiment du tribunal, County Court House] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 60150

Dr. Vernon Stauffer [left] on the California Christian College campus, Los Angeles, California, 1921

Dr. Vernon Stauffer [left], Dean and Professor of New Testament and Church History and unidentified on the California Christian College campus [later Chapman College], Los Angeles, California, 1921.

Dr. Vernon Stauffer, first dean of California Christian College, Los Angeles, California

Seated outside the building entrance is Dr. Vernon Stauffer, first dean of California Christian College, Los Angeles, California, ca. 1921. [Later Chapman College]

Charles Clarke Chapman, Los Angeles, California, 1923

Charles Clarke Chapman, Los Angeles, California, 1923. Photographic portrait taken outdoors, postcard format.

Charles Clarke Chapman, Los Angeles, California, ca. 1895

Studio portrait photograph of Charles Clarke Chapman, Los Angeles, California, ca. 1895

Office of Charles C. Chapman, Los Angeles, California

Office of Charles C. Chapman, Los Angeles, California.