. Bulletin of the Geological Society of America. Geology. 158 W. O. CROSBY—ARCITEAN-CAMBRIAN CONTACT IX COLORADO there a harder layer of lava or quartzite forms a low ridge, but as a whole the basal layei's of the Cambrian were deposited upon a nearly level ; The accompanying figure, the more essential part of which is repro- duced here, is in perfect agreement with the text, and shows a like un- conformity between the Grand Canyon group (Unkar and Chuar) and. Figure \U.—Section of North Side of Grand Canyon (Gilbert). Showing same uuconformities as figure 33 and a pre-Tonto fault
. Bulletin of the Geological Society of America. Geology. 158 W. O. CROSBY—ARCITEAN-CAMBRIAN CONTACT IX COLORADO there a harder layer of lava or quartzite forms a low ridge, but as a whole the basal layei's of the Cambrian were deposited upon a nearly level ; The accompanying figure, the more essential part of which is repro- duced here, is in perfect agreement with the text, and shows a like un- conformity between the Grand Canyon group (Unkar and Chuar) and. Figure \U.—Section of North Side of Grand Canyon (Gilbert). Showing same uuconformities as figure 33 and a pre-Tonto fault. the Vishnu group of the Algonkian. Both of these unconformities were also noted b}^ Gilbert* (figure 34). According to Walcott,t Packsaddle mountain, in Texas, exhibits a similar relation of the Algonkian and Cambrian strata (figure 35). Ci)per Cambrian, Ibsails. , . j-L.^^perOaml> 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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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
