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Geology of Jawbone Canyon, Kern County, California: Supplement 1 from "Geology of the Jawbone Canyon region, Kern County, California" (Thesis)
No full textThe work on the Jawbone Canyon area was undertaken
at the suggestion of Dr. J. P. Buwalda, with the intention of working out the physical, aerial and historical relations as completely as possible. The problem was carried on by Mr. G. A. Schroter and myself as partial fulfillment of the requirements for the degree of Bachelor of Science.
Operations began about the middle of January, 1928, and lasted until the first of June of the same year. The total time spent in the field amounted to approximately twenty-six days, since but two days of each week were available for this work
Geology of part of Tehachapi Mountains in the vicinity of Jawbone Canyon, California: Supplement 2 from "Geology of the Jawbone Canyon region, Kern County, California" (Thesis)
No full textThe work on the Jawbone Canyon area was undertaken
at the suggestion of Dr. J. P. Buwalda, with the intention of working out the physical, aerial and historical relations as completely as possible. The problem was carried on by Mr. G. A. Schroter and myself as partial fulfillment of the requirements for the degree of Bachelor of Science.
Operations began about the middle of January, 1928, and lasted until the first of June of the same year. The total time spent in the field amounted to approximately twenty-six days, since but two days of each week were available for this work
Geologic Map: Supplement 1 from "The geology of the southwestern part of Lake Elizabeth quadrangle between San Francisquito and Bouquet Canyons" (Thesis)
No full textThe San Andreas Rift forms one of the largest and most continuous structural features in the world and as a fault system, has few equals in magnitude of displacements, complexity of movement or size of area affected. The structural relation resulting from the continued movement upon it and auxiliary fault systems is typical of Coast Range structure. Each contribution to the understanding of the structural features in the vicinity of the San Andreas Rift aids in the ultimate understanding of the major feature.
It was with the desire of becoming acquainted with some of the features evidenced by major faulting systems as well as the solution of the geology of an area in Coast Range structure that this problem was undertaken.
Dr. Kew in U.S.G.S. Bulletin 755 has published on the San Fernando and Tujunga quadrangles lying south of Lake Elizabeth quadrangle. Mr. Clements, of the California Institute of Technology, is at the present time engaged in working out the relations in the Tejon quadrangle on the west. Dr. Noble is making an extensive survey of the Rift itself for the Seismological Department of the Carnegie Institute and has mapped as far north along the Rift as Palmdale in Lake Elizabeth quadrangle
Topographic map of the San Pedro Hills: Supplement 1 from "Report on the Geology of the San Pedro Hills" (Thesis)
No full textThe San Pedro Hills Area is composed of Basement Complex overlain by a series of late Tertiary and Quaternary marine sediments. There is a series of intrusive rocks forming sills and laccolithic masses in the vicinity of San Pedro Hill.
There is a great abundance of fossil material in the very late Tertiary and Quaternary beds, offering ample opportunity for the paleontologist to accurately zone the different formations.
The folding is quite acute, but there has been no important faulting in the area
Geologic Plate: Supplement 1 from "Geology of a portion of the Tehachapi Mountains in the vicinity of Jawbone Canyon, California" (Thesis)
No full textThe region embraced within this report lies in the West central part of Kern County, California, about twenty miles North and East of the little railroad town of Mohave. It is approximately 138 miles due North of Los Angeles, and may easily be reached by good road via the Midland Trail.
The area comprises about 45 square miles in the Eastern portion of the Tehachapi Mountains, and is roughly bissected by Jawbone Canyon which trend's almost due East and West.
With respect to other great geographic divisions of
the Western United States, the area covered lies in the
Western portion of the Great Basin province.
North of the town of Mohave, the Tehachapi Mountains
trend about N. 40° E., and continue in their Eastward extension until they join the El Paso range.
Considered in a broad way, the Eastern portion of the
Jawbone Canyon area consists of the flat floor of the
Mojave Desert. The floor of the desert is abruptly terminated by the Tehachapi Mountains, and from here Westward, the region is made up chiefly of naked hills and deep canyons.
The trip to Jawbone Canyon by automobile can easily be made in about four hours, from Los Angeles.
Within five miles of the mouth of Jawbone Canyon, lies
the Owenyo branch of the Southern Pacific Railroad.
All of the area above described lies entirely within the
Mojave Quadrangle of the United States Geological Survey
Geologic Map: Supplement 1 from "The geology of the Quail Lake region" (Thesis)
No full textAt the suggestion of Dr. Bulwalda of the Institute Staff, the mapping and investigation of this hitherto little known section of the Mojave Desert was undertaken. It had been known for some time that there were marine beds lying in the extreme western corner of the desert, their age relation however, had been but tentatively determined and their areal extend and structural relations were unknown. U.S. Geol. Survey Water Supply Paper 278 by Harry R. Johnson is the only paper known to the writer which deals with this area.
In the present study, an effort is made to map the areal geology as carefully as possible in the short time available and to determine the age and structural relations of the marine formation
Alhambra Quadrangle: Supplement 1 from "The geology of the northwestern portion of the Alhambra Quadrangle" (Thesis)
No full textThe region considered lies between the principal sections of Los Angeles and Alhambra, more strictly it is
bounded on the north by the 34°06' parallel, or about the
southern limit of south Pasadena, on the west by the 118°12'
meridian, on the south approximately by an extension of
Garvey Avenue, and on the east by Fremont Avenue. The area
included is about nine square miles. The map used is the
Alhambra Quadrangle recently published by the U.S.G.S. The
scale of the map is 2000 feet to the inch and the contour
interval is 5 feet up to the 500 foot level and above this
the interval is 25 feet. The map is quite satisfactory except that the variation in contour interval gives the hilltops an unnatural aspect.
The problem was attacked by making a general study
of the region with an eye toward becoming familiar with the
different materials that were to be encountered, always recording dip, strike, locality, remarks and materials that were studied. The areal map was next constructed by using the principal sandstone as a key bed and correlating the structure of the formations above and below to the structure indicated by this sandstone. The boundaries of the Quarternary alluvium were located principally on the basis of change of slope.
The exposures of underground structure in the area
are all good and consist principally of road cuts and other
artificial excavations. However, in many places natural outcrops as a result of erosion were of considerable value.
Also, another somewhat unique circumstance facilitated the
problem. Along the northern boundary of the southern branch
of the El Sereno sandstones just above Ascot Park and extending to Alhambra Boulevard, the marked contrast in weeds and grasses on either side of the contact between shale on the north and sandstone on the south made it possible to trace the contact with great ease, the accuracy of the procedure being born out here and there by good exposures. The grass in the shale consisted principally of wild barley, etc. In the sandstone in addition to wild barley there was a fairly dense growth of wild mustard. The nearer to the contact the more dense was this growth; also, scattered here and there were cactus plants. No cactus was observed in the shale. Further investigation showed that the sands near the contact were more moist than the shale on the other side. It was also noted that the character of the surface soil was highly indicative of underground material; for example, the shale surf ace after a rain and then a couple of hot days became hard, compact, and cracked, but the sand surface did not crack and remained loose. The capillary action between the sands and ground water, and the compactness of the clay shales account for the contrast in vegetation. It was only in the hills that this feature was observed because of the thinness and "in situ" character of the soil