Show ROCK BOCK FALLS IN ZION CANYON NUMEROUS by what Is called slab erosion in which great slabs of 0 sandstone tall fall in ill one piece many ac scars i ars aro are left in zion canyon showing allowing that tile falls are comparatively frequent A tremendous piece tell fell out of 0 the big red arch aich near the public camping ground this fall ol of rock from the face of 0 tho the cliff occurred about 1880 81 it left a huge scar ecar on the rock wall giving rise to the local ID c il name by which it Is known by residents there the scar the rock which tell fell out mostly pulverized and built up the sandy slope just back of tho the museum and occurring only fifty years ago it Is not yet fully covered with vegetation the latest tall fall occurred on july 4 1933 at 6 10 a in with great noise of falling rocks and a largo large cloud of dust was seen been it was just juat opposite the tha wylle wylie grove A huge mass fell from the east baat side aide of the west temple may 12 1926 it mostly pulverized another slab fell from the south side aide of east bast temple in july 1929 it also pulverized on the barnyock bars bare rock yock below the known slabs of 0 smaller size which have fallen in the last tew few years are too numerous to ment mention ibri showing that constantly the forces of nature are at work and the canyon slowly widening zion alon national park presents one of the deepest nearly vertical canyons tn in the world in that portion called the narrows here the erosion is downward tn in a narrow path in one instance the walls being within 10 feet beet and nearly 1600 feet vertically to the top |