Paleontology of the Coalinga District, Fresno and Kings Counties, California

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U.S. Government Printing Office, 1909 - Paleontology - 173 pages
 

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Page 29 - Ridge and at some other places in the Coalinga district, thus marking a sharp and easily recognizable variation in lithology between the beds below and above it. At other places, however, especially in the southern portion of the Kreyenhagen Hills, the blue sands occur also far below the Glycymeris zone, so that the lithologic feature can not be relied upon everywhere as a basis of separation. In the description of the Jacalitos (early upper Miocene) frequent reference has been made to the overlying...
Page 28 - Anderson's statements and on the basis of the reasons stated below the Etchegoin formation is mapped and described in the present paper as the succession of slightly consolidated beds of sand, gravel, and clay occurring on the summit and flanks of Anticline Ridge and on the southeast end of Joaquin Ridge north of Coalinga, above the base of the hill-forming sandstone beds (referred to for convenience as the Glycymeris zone), and below the beds described as the Paso Robles formation.
Page 8 - ... as the edge of the valley is approached. The different formations that may be recognized as units in this series, with the time divisions to which they correspond, are as follows, from the oldest to the youngest: Franciscan (Jurassic?), Knoxville...
Page 8 - They indicate that the greater portion of the area included within the Coalinga district was beneath the sea during intervals occupying probably the major portion of the time from the Jurassic to the end of the Miocene. The latest movements of the land, which produced the features of topographic relief now to be seen, did not take place until Quaternary time.
Page 16 - Reef Ridge. They are much more resistant to erosion than the soft associated beds, and, dipping toward the valley on the northeast at an angle varying from 50 to 80, they form the scarp and double row of pinnacles of Reef Ridge fronting the foothills on that side.
Page 22 - It is here named the Jacalitos formation owing to its characteristic exposures both north and south of the creek of that name. Abundant and well-preserved fossils, by means of which its age is determined, occur in the type locality. It is probably the equivalent of parts of one or more of the upper Miocene formations known in other parts of the State, but its definite relations to these have not yet been worked out. It is in part represented in the northern portion of the district by similar beds...
Page 19 - ... reef beds" are a part, with the Vaqueros formation of the outer Coast Ranges, is based on the large number of species common to the two. At one point in particular on the northeastern flank of the Temblor Range, near Antelope Valley, in sec. 36, T. 26 S., R. 17 E., a few miles south of the south line of the district, the "reef beds...
Page 10 - Franciscan formation just described, and covering a wide belt for the most part west of the foothill region. They form the high hills north and south of Los Gatos and Waltham creeks and may be easily recognized by the dark, thin-bedded, compact shale and sandstone of the lower portion and the massive, drab, concretionary sandstone of the upper portion. These rocks are of Cretaceous age and comprise part or all of the two formations well known elsewhere on the west coast as Knoxville (lower Cretaceous)...
Page 7 - Range and the San Joaquin Valley. It is largely a region of foothills that rise on the west into the mountains and merge on the east with the wide level plain. The foothills form several groups around the base of spurs descending southeastward from the Diablo Range, the groups being separated from each other by reentrant valleys that open out to the San Joaquin Valley. The Diablo Range in this latitude is a rugged mountain group made up of various component members, some of which, owing to a complication...
Page 22 - Margarita formation was believed to be the equivalent of the San Pablo formation of the Mount Diablo region, but the stratigraphic work in the Coalinga district has shown it to be older. It is quite evident that the Etchegoin formation represents at least a considerable part of the San Pablo, and as the Etchegoin lies well above the beds containing the Santa Margarita fossils it seems likely that the Santa Margarita formation is, in part, of greater age than the San Pablo.

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