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

Glacial drift. Undifferentiated, green clay with plant remains andyellow-brown, fine-grained loess. Erosional unconformity separatesdrift and loess from the Bankston Fork Limestone.Bankston Fork Limestone Member. Limestone, light to mediumgray, finely crystalline, argillaceous, contains marine fossils.Anvil Rock Sandstone Member. Sandstone, quartzitic, light grayto brown, very fine to medium grained, micaceous, argillaceous,and carbonaceous. The sheet phase, which overlies the LawsonShale Member, contains shale interbeds, a sparse fauna of bivalves,burrows, and abundant plant fragments. The channel phase,which locally cuts down to the Jamestown Coal Member at DeltaMine, displays large-scale cross-beds, becomes finer grained upward,and contains coal and plant fragments.Lawson Shale Member. Shale, medium gray, micaceous, silty,interbedded lenticular s,iltstone beds with microcross laminationsand thin sandstone beds filling channels. Contains plant fragmentsand horizontal and vertical dwelling burrows, feeding burrows,and trails. Absent where removed by Anvil Rock Sandstone.Conant Limestone Member. Limestone, medium to dark gray,argillaceous, fossiliferous; contains a diverse offshore marine fauna(including sponges, corals, bryozoans, brachiopods, bivalves,gastropods, edrioasteroids, and crinoids) and some plant debris.Absent where removed by Anvil Rock Sandstone.Jamestown Coal Member. Coal, bright banded, thin.Unnamed limestone member. Limestone, dark gray, argillaceous,and fossiliferous. Contains a diverse, offshore marine fauna(sponges, corals, bryozoans, brachiopods, bivalves, gastropods,and crinoids) and in situ Stigmaria. Amount of detrital clay increasesnorthward, and the unit is locally absent.Unnamed shale member. Shale, dark gray, calcareous, fossiliferous.Contains a diverse offshore marine fauna (including fusulinids,corals, bryozoans, brachiopods, crinoids, and echinoids). Unitthins and becomes more argillaceous northward and may be absentin the pit.Brereton Limestone Member. Limestone, micritic, gray, dense,fossiliferous, and/or argillaceous. Contains a diverse, offshore,shallow marine fauna (including fusulinids, other foraminifera,sponges, corals, bryozoans, brachiopods, bivalves, and crinoids),and some plant fragments.Anna Shale Member. Shale, dark gray to grayish black, with sheetyfissility. Highly carbonaceous and contains a sparse brackish tomarine fauna (including conodonts, shark teeth, fish spines,Dunbarella, and Orbiculoidea) and driftwood fragments.Energy Shale Member. Shale, soft, gray, contains plant fragmentsand a sparse marine fauna (bivalves, cephalopods, and brachiopods).Locally a thin (4 to 5 inches), thin-bedded dark gray shaleis present at the base.Herrin (No. 6) Coal Member. Coal, bright banded, can containseveral clay partings, one of which is the prominent "blue band"in the lower part of the coal. Locally contains coal balls.Underclay. Clay, soft, gray to greenish-gray, rooted.ISGS 1979Figure IL-43. Columnar section and description of rock units, Delta Mine (Stop 11 1. (After Utgaard, 1979.)