. Bulletin of the Geological Society of America. Geology. PALEOGEOGRAPHY OF THE MESOZOIC 511 of the Comanchian seas, which are of the Atlantic-Tethyian realm, a condition indicating that the two provinces were more or less, though not completely, separated from one another by a land barrier, the Mexican peninsula. Along the Pacific coast from San Luis Obispo County, California, northward far into Oregon there is evidence of crustal movement during Shastan time. Anderson states that the Knoxville is everywhere in this. OROCRAPHY OF LATE COMANCHIAN TIME Figure 6.—Map showing Regions of Elevation
. Bulletin of the Geological Society of America. Geology. PALEOGEOGRAPHY OF THE MESOZOIC 511 of the Comanchian seas, which are of the Atlantic-Tethyian realm, a condition indicating that the two provinces were more or less, though not completely, separated from one another by a land barrier, the Mexican peninsula. Along the Pacific coast from San Luis Obispo County, California, northward far into Oregon there is evidence of crustal movement during Shastan time. Anderson states that the Knoxville is everywhere in this. OROCRAPHY OF LATE COMANCHIAN TIME Figure 6.—Map showing Regions of Elevation {horizontal Shading and solid Black), the Formation of the Coloradoan Oeosyncline (right-hand oblique Lines), and the Pacific Overlap. Generalized from Ransome, "Problems of American ; The black area Is that of the present Columbia River Plateau; the region of elevation to the north is known as the Northern Interior Plateaus, while that on the south is the Nevadan-Sonoran region. area penetrated and disturbed by dikes and masses of serpentine and peridotites. Moreover, in the Coast Range of southern California, where these intruded rocks occur, the Horsetown strata are also absent, while the Chico of Cretaceous time unconformably overlies the older formations. In western Utah, eastern Nevada, and throughout Idaho uplift was making itself felt as early as Middle Triassic time, forming the arch of the Columbia River Plateau, which persisted into late Jurassic time (the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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