. Bulletin of the Geological Society of America. Geology. 366 R. A. DALY THE OKANAGAN COMPOSITE BATHOLITH granites alongside. We have seen, on the contrary, that the Similkameen granite on the east is notably free from such records of orogenic turmoil, while the shear zones of the Eemmel batholith on the west most probably antedate the Cathedral granite intrusion. The very scale of these great bodies is suggestive of bodily replacement; it is hard to visualize an earth's crust which would so part as to permit of the laccolithic or chonolithic injection of a mass as great as a batholith. The ge
. Bulletin of the Geological Society of America. Geology. 366 R. A. DALY THE OKANAGAN COMPOSITE BATHOLITH granites alongside. We have seen, on the contrary, that the Similkameen granite on the east is notably free from such records of orogenic turmoil, while the shear zones of the Eemmel batholith on the west most probably antedate the Cathedral granite intrusion. The very scale of these great bodies is suggestive of bodily replacement; it is hard to visualize an earth's crust which would so part as to permit of the laccolithic or chonolithic injection of a mass as great as a batholith. The general absence of bedded rocks into which any one of the batho- liths was irrupted means that some of the usual criteria of replacement can not be applied. It is therefore a matter of special importance that a. Figure 9.—Plunging Contact Surface between intrusive Qranodiorite and Cretaceous Argillites and Sandstones. Drawn from a photograph of the west end of the Castle Peak stock. View looks south. Contact shown by heavy line in middle of view ; the point "B" in figure 7 is at the upper end of this line. Intrusive granodiorite on left, argillites and sandstone on right. The vertical distance between the two ends of the contact line as drawn is 1,500 feet. Castle peak on the left. small Tertiary stock, such as Castle peak, a satellite of the composite batholith itself, gives unequivocal proof of the doctrine of batholitbic re- placement. The Castle Peak stock, which covers 10 square miles in area, is located on the divide between the Pasayten and Skagit rivers, in the rugged crest of the Hozoineen division of the Cascade range. The peak is the highest of a group of noble mountains lying wholly or in part within this small plutonic area. This igneous body is composed of typical granodio- rite with a strong basified contact zone of hornblende-biotite quartz dio- rite. The area and ground plan of the stock are shown in figure 7. The. Please note that these images are ex
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