Physical features of the Des Plaines Valley . ast wall of the gorge (Plate 2, B.) Three cherty bands in the lime-stone mark out the stratification, and serve to distinguish the offset onthe right and left side of the fault plane, which is one of the master iSee Salisbury, Physiography, pp. 419-426. 1907. 22 THE Di:s PLAINES VALLEY. [bull. no. 11 joints running northwest-southeast. The block on the right (southwest)side has risen fully a foot with reference to that on the left. On thenorthwest side of the gorge the continuation of this fault is somewhatconcealed, but careful search will discove
Physical features of the Des Plaines Valley . ast wall of the gorge (Plate 2, B.) Three cherty bands in the lime-stone mark out the stratification, and serve to distinguish the offset onthe right and left side of the fault plane, which is one of the master iSee Salisbury, Physiography, pp. 419-426. 1907. 22 THE Di:s PLAINES VALLEY. [bull. no. 11 joints running northwest-southeast. The block on the right (southwest)side has risen fully a foot with reference to that on the left. On thenorthwest side of the gorge the continuation of this fault is somewhatconcealed, but careful search will discover the extension of the same jointplane, which is here accompanied by a zone of cinished or brecciatedrock between the dislocated sides. Tlie rock, though decayed, has notwholly lost the half polished, half shredded surface produced by theslipping, a surface known to miners and geologists as is not sufficiently well preserved, however, to show the exact directionof the dislocation. STATE GEOLOGICAL SURVEY. BULL. NO. 11, PL. A. Lock on the Illinois-Michigan Canal, above Joliet.
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