Search results
Results From The WOW.Com Content Network
The Barstow Formation is a series of limestones, conglomerates, sandstones, siltstones and shales exposed in the Mojave Desert near Barstow in San Bernardino County, California. [ 1 ] [ 2 ] It is of the early to middle Miocene epoch, (19.3 - 13.4 million years ago) in age, in the Neogene Period. [ 3 ]
The bulk of the Sisquoc north of the Santa Ynez River was deposited as a fine mud, rich with diatoms. Tests of these tiny marine creatures form diatomite, and some of their organic remains persist as the high organic carbon content of parts of the formation (when conditions are right, these organic remains form petroleum reservoirs). South of ...
The oldest rocks in California date back 1.8 billion years to the Proterozoic and are found in the San Gabriel Mountains, San Bernardino Mountains, and Mojave Desert.The rocks of eastern California formed a shallow continental shelf, with massive deposition of limestone during the Paleozoic, and sediments from this time are common in the Sierra Nevada, Klamath Mountains and eastern Transverse ...
In contrast, coastal marine terraces can be preserved only by tectonism or a progressive lowering of sea level. The seismically active coastline of southern California, USA, [6] for example, can be considered an emergent coastline, where tectonism due to transpression provides uplift of shorelines formed during periods of relatively high sea ...
California was a region of geologic upheaval during the Mesozoic, including both Mountain formation and volcanism. The Sierra Nevada began forming at this time. Mesozoic California included areas of both marine and terrestrial environments. The local seas were home to a variety of marine invertebrates and marine reptiles.
The long-term preserved geologic record of a sedimentary basin is a large scale contiguous three-dimensional package of sedimentary rocks created during a particular period of geologic time, a 'stratigraphic succession', that geologists continue to refer to as a sedimentary basin even if it is no longer a bathymetric or topographic depression. [6]
Two human skeletons, a male and a female, were found in La Jolla, California, in 1976; they date back at least 9,500 years. They were found during construction work on a house. They were the subject of a decade-long legal battle. The University of California decided to return the remains to one of the local Kumeyaay Indian bands. This was done ...
The California River has been proposed to explain the origin of the deltaic Colton Formation, as it has a high volume and similar source rocks are rare in the area of the Uinta Basin. Rock formations of similar origin occur in southeastern California and southwestern Arizona [4] and may have been located along the same drainage. [20]