Edited by James E. Palmer and Russell R. Dutcher - University of ...
Edited by James E. Palmer and Russell R. Dutcher - University of ...
Edited by James E. Palmer and Russell R. Dutcher - University of ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Figure 11-1 3.Extensively cross-bedded Battery Rock S<strong>and</strong>stone Member <strong>of</strong> Caseyville Formation in interval about 90 feet (27 rnjabove base <strong>of</strong> exposed section along Garden <strong>of</strong> the Gods access road. Four tabular sets <strong>of</strong> planar cross-beds areshown. The direction <strong>of</strong> maximum dip (not corrected for structural dip) <strong>of</strong> the cross-beds is shown on the rightmargin. Deposition <strong>of</strong> the s<strong>and</strong>stone evidently was not influenced <strong>by</strong> the trend (south-southwest) <strong>of</strong> the underlyinglnman Valley. (Scale: one foot <strong>and</strong> one inch units.)lenticular beds <strong>and</strong> low bluffs. Ripple marks are abundant,particularly in the siltstone <strong>and</strong> shale. Apprsximatelyhalf <strong>of</strong> the interval is Lusk Shale.The Battery Rock S<strong>and</strong>stone is a prominentcliff-forming unit throughout southern Illinois. Thelower 8 feet (2.4 m) <strong>of</strong> Battery Rock S<strong>and</strong>stone in thisexposure is a massive, coarse s<strong>and</strong>stone containing bothtrough <strong>and</strong> planar cross-bedding <strong>and</strong> many quartz pebbles,locally becoming conglomeratic. This unit gradesupward into a cliff-forming, thickly bedded, mediumgraineds<strong>and</strong>stone, somewhat cross-bedded at thebase <strong>of</strong> <strong>and</strong> becoming extensively cross-bedded upward.Cross-bedding is dominantly planar, Iocaliytrough. White quartz pebbles are locally abundant. Thisgrades up into thinly bedded <strong>and</strong> cross-bedded s<strong>and</strong>stone<strong>and</strong> ripple-marked shaly s<strong>and</strong>stone. This finingupwardsequence is typical <strong>of</strong> modern fluvial deposits.24.2 Board buses, proceed west on Garden sf theGods access road. View <strong>of</strong> Eagle ValleySyncline on right (north).24.9 Enter Garden <strong>of</strong> 'the Gods Recreation Area.25.4 Bluffs <strong>of</strong> Pounds S<strong>and</strong>stone Member (CaseyvilleFormation) adjacent to highway on right(fig. IL-15).25.6 Gate to parking lot, Garden <strong>of</strong> the GodsRecreation Area.arden 0f the Gods is located in rocks <strong>of</strong> thes S<strong>and</strong>stone Mem er <strong>of</strong> the Caseyville Formation,on the south limb <strong>of</strong> the Eagle Valley Syncline,<strong>and</strong> is one <strong>of</strong> the most scenic areas <strong>of</strong> Illinois (frontcover). Long-continued erosion <strong>of</strong> the uplifted southerniimb <strong>of</strong> the syncline has res~~lted in deeply dises(dip is about 1 QO N)t consist <strong>of</strong> stronglyirnentary features <strong>of</strong>een at Garden <strong>of</strong> thecross-bedding, ripplemarks, graded bedding, birnoda! sorting <strong>of</strong> medium- tose-grained s<strong>and</strong>stone containing white quartz peb-, <strong>and</strong> Liesegairg b<strong>and</strong>ing.
Change language