. Bulletin of the Geological Society of America. Geology. 140 W. O. nRORBY ARCHEAN-CAMBRIAN CONTACT IN COLORADO gulch the line of contact, exposed only at intervals and dipping 10 de- grees to the east and southeast, curves to the north and west around a high hill to the point where it is cut off" by the Ute fault. At two points +J' + ++.+ 1+ + + "*"++ + I inch = 2-^eeX. Figure 3.—Contact broken by a Gravity Fault. +^ + [inch = eet. Figure 4.—Contact broken by a Thrvst Fault. on the west side of the hill the contact is seen to be broken by minor but very c
. Bulletin of the Geological Society of America. Geology. 140 W. O. nRORBY ARCHEAN-CAMBRIAN CONTACT IN COLORADO gulch the line of contact, exposed only at intervals and dipping 10 de- grees to the east and southeast, curves to the north and west around a high hill to the point where it is cut off" by the Ute fault. At two points +J' + ++.+ 1+ + + "*"++ + I inch = 2-^eeX. Figure 3.—Contact broken by a Gravity Fault. +^ + [inch = eet. Figure 4.—Contact broken by a Thrvst Fault. on the west side of the hill the contact is seen to be broken by minor but very clear faults (figures 3 and 4). Returning to the east side of Fountain creek, the contact is found to be well exposed on the south side of the small gulch between the quarr}" and Rainbow fall, where it is involved in a sharp inverted flexure (figure 5) - -Red. . White. + + + + . ++ + 4-. v-r^- :^-^:+-^^ Figure i>.— Ocerthrust of basal Cambrian Beds on East Side of Utc Pass. accompanied by obliteration of the bedding of the sandstone. Toward the left (east) end of the upper limb of the fold the contact is broken in a way (figure 6) to suggest both faulting and shearing, with injection of the gray sandstone into the broken granite, and thus throwing light on the formation of the sandstone dikes. The exposure here trends east-. 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
