A geological excursion in the Grand Caņon district

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Boston Society of Natural History, 1909 - Science - 27 pages
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Page 148 - I do not recall an instance where the lifted beds are planed off by erosion, so as to make a continuous level with the thrown beds
Page 161 - 82. The Tertiary history of the Grand Canyon district. US geol. surv., monogr. 2, 1882. Gilbert, GK '75. Report upon the geology of portions of Nevada, Utah, California, and Arizona, examined in the years 1871 and 1872. US geogr. surv. west of 100th mer., vol. 3, p. 21-187, 1875. Geology of portions of New Mexico and Arizona, explored and surveyed in 1873. Ibid., p. 507-567. Huntington, E., and Goldthwait, JW '04. The Hurricane Fault in the Toquerville district, Utah. Bull. mus.
Page 142 - Powell ('75, p. 192) relates the peculiar form of the cliffs to the "line of displacement" in a general way; Dutton ('82, p. 205) considers it the effect of "the considerable inclination of the strata"; but Davis ('01, p. 141-142) suggests that "strike faults with small throw, torn on the slope of the monocline," may be responsible for the features observed. As has been shown by Davis, the character of the cliffs is not due to local increase in the dip of the strata, nor to changes in the thickness...
Page 135 - Robinson ('07, p. 109) has recently denned the limits of this particular subdivision of the plateau province, and employed the name San Francisco to designate it. The name is appropriate, for the district is dominated by the San Francisco Mountain group, of which San Francisco Peak is the highest point, while a large part of the area is included in the San Francisco Forest Reserve. The name Coconino Plateau is generally restricted to the higher portion of the San Francisco Plateau lying south of...
Page 160 - crags' of the Echo Cliff probably owe their peculiar form to erosion guided by strongly marked crossbedding, and possibly in part also to the influence of a well developed system of joints. The Sevier and Toroweap Faults are independent and do not join. each other to form one great displacement, as has been thought might be the case. The Hurricane Cliffs in the vicinity of the Virgin River are true fault cliffs wholly due to recent faulting at two different periods. In all, three periods of faulting...
Page 155 - ... the face of the cliff; and wherever a stream valley occurs in the limestone cliffs, the lava strip follows up the valley for some distance. There is no evidence of faulting between the lava and the face of the limestone cliffs. The lava strip was traced far enough south to see that it could have no possible relation to the cap of Sugar Loaf Mesa.
Page 154 - ... along the Hurricane Fault were for the most part confined to that portion of its course north of the Grand Canon district, between the High Plateaus and the Great Basin. Such facts as we noted in the Grand Canon district related to features already described by Davis ('01, p. 146-147; '03, p.
Page 157 - ... plane just west, in the region of this particular cross section. The 300-feet displacement recorded by Huntington and Goldthwait at the Virgin River represents the movement due to the third faulting only; while the 1,400-feet displacement noted a little farther south represents the movements of both the second and the third faulting periods.
Page 156 - River, showing relation of beds to Sugar Loaf Mesa (farther south), with evidence of three periods of faulting. cane Ledge are then true fault cliffs of much more recent date than the fault-line cliffs we have considered under preceding headings. If we take into account the monoclinal folding of the plateau series which preceded the first faulting, and ignore the "drag...
Page 166 - ... 49-64, 1890. Printed May, 1909. EXPLANATION OF PLATES PLATE 17. Fig. 1. Bear Wallow Gulch, a small cafion in southern edge of San Francisco Plateau. Fig. 2. Oak Creek Fault (F), cutting mesa near Mogollon Rim.

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