Edited by James E. Palmer and Russell R. Dutcher - University of ...

Table I L-2. Characteristics and inferred depositional environments of genetic units exposed in Kinkaid Lake SpillwayPaleocurrent Inferred depositionalLithology Sedimentary features characteristics environmentUNIT 6Sandstone, quartzose, fine tomedium grained, buff to brown,contains zones of clay pebbles,lenses of mudstone and siltstoneConformable lower surface, small Bimodal-bipolar, Distributaryscale trough cross-bedding, wood north and south mouth barcasts, carbonaceous plantfragmentsUNIT 5Claystone-mudstone, brown(70 cm)Shale, gray (30 cm)Parallel laminations, plantfragmentsAbandoneddistributarychannelSandstone, quartzose, finegrained, tan, thin zone of claypebbles (1 5 cm)Siltstone, quartzose, tight gray,contains interbeds of shaleRipples (probably of swashorigin), ioad structures, horizontalburrowsUNIT 4Sandstone, quartzose, fine tomedium grained, reddish-brown,iron stained, clay pebbles at base,interbeds of light gray siltstoneand gray shaleErosional lower surface, thicktrough cross-bed sets withcurrent ripples on foresetsUnimodal, northActivedistributarychannelUNlT 3Shale, gray; interbeds of finegrained, well sorted quartzosesandstone (more numerous nearbase of unit)Carbonaceous plant fragments inshale, linguoid ripples on sandstoneinterbedsOpeninterdistributarybayUNIT 2Sandstone, quartzose, very fine tofine grained, tan, interbeds ofwhite siltstone and ghy shaleConformable lower surface,tabular beds of rippled sandstoneCrevasse splay intoopen bay or (less likely)delta front marginalsheet or distal bar sandsUNlT 1Sandstone, quartzose, mediumgrained, brown, iron stained,zones of clay pebblesLower surface not exposed, largescale trough cross-bed sets withsinuous-crested and linguoidcurrent ripples on foresets, woodcasts commonUnimodal, northActive distributarychannel(Source: Leming, 1973,1976, with modifications)ing of loess. Rocks of the Mississippian Systemare locally exposed at the base of the 41.5bluffs. Present in ascending order are the 43.1Clore Formation, Degonia Sandstone, andKinkaid Limestone of the Chesterian Series(upper Mississippian). Outcrop areas of the 45.0Degonia Sandstone commonly contain 45.3slumped blocks of sandstone; the KinkaidLimestone and Clore Formation are corn- 48.3monly obscured by vegetation and loose rockdebris.Intersection, lllinois Routes 3 and 1151. Turnright. Proceed northward on lllinois 151. ReenterShawnee National Forest. Note theHopewellian Indian mound on left adjacent to 48.8Illinois 3 (fig. IL-56). Many mounds such as 49.7this one were built in this area by Indians ofthe Hopewellian Culture (300 B.C. to 400A.D.)Crossing Kinkaid Lake.Outcrop, both sides of road. Thin-bedded,dark gray shale and siltstone of the AbbottFormation.Enter Ava, Illinois.Junction, lllinois Routes 151 and 4. Turn left.Proceed northwest on lllinois 4.Top of hill. Tipple and stripping shovel of theLeahy Mine (AMAX Coal Company) may bevisible to right in distance. This mine is oper- 'ating in both the Herrin (No. 6) and Harrisburg(No. 5) Coal Members of the CarbondaleFormation.Enter Campbell Hill, Illinois.A now abandoned mine of the Campbell HillCoal Company was located in junkyard onright. Several underground coal mines in this