. Conodonts from the Glen Dean formation (Chester) of the Illinois basin. Conodonts; Paleontology; Paleontology. 12 ILLINOIS STATE GEOLOGICAL SURVEY Fig. 7.—Walches Cut, locality 6. Illinois Central Railroad cut about miles E-NE of Scotts- burg. Section illustrated begins about 50 yards east of overpass bridge. Carter coordinates 23-H-21, 4000 feet N. of S. line, 1035 feet E. of W. line of quadrangle H-21, Princeton East quadrangle, Caldwell County, Kentucky. oniodus erectus, appear to be restricted to the lower Chester. Representatives of the genera PoJygnatliiis and Synprioniodina are al
. Conodonts from the Glen Dean formation (Chester) of the Illinois basin. Conodonts; Paleontology; Paleontology. 12 ILLINOIS STATE GEOLOGICAL SURVEY Fig. 7.—Walches Cut, locality 6. Illinois Central Railroad cut about miles E-NE of Scotts- burg. Section illustrated begins about 50 yards east of overpass bridge. Carter coordinates 23-H-21, 4000 feet N. of S. line, 1035 feet E. of W. line of quadrangle H-21, Princeton East quadrangle, Caldwell County, Kentucky. oniodus erectus, appear to be restricted to the lower Chester. Representatives of the genera PoJygnatliiis and Synprioniodina are also restricted to pre-Glen Dean rocks in the type Chester area but must be eval- uated further. Six species have been recorded from only the Glen Dean. Three, Kladognathus mehli, Lonchodina fumishi and Roimdya costata, are uncommon; but the remaining three, Hihhardella ortha, Larnbdagnathus fragili- dens, and Lonchodina poracJaviger, are sufficiently abundant to appear stratigraph- ically significant. Uniformity of the Glen Dean Fauna The over-all uniformity of the conodont fauna is impressive from three standpoints: first, uniformity in differing lithologies; second, uniformity between the lower and upper parts of the formation; and third, geographic uniformity. One important ex- ception to this pattern will be noted later No differences were found in the species represented in collections from differing types of limestone—oolitic, crinoidal, dolo- mitic, and others—nor between various kinds of shale. Conodonts were found to be more abundant and better preserved in LOG. 6-WALCHES CUT Sandstone, tan, massive. 31' Covered interval. 8' Limestone, gray, thin-bedded, ^ sandy, abundantly fossiliferous. 2'6" Stiale, dark gray, calcareous, with limestone beds, fossiliferous. 9' Sandstone, gray, calcareous, \ fossiliferous. I'-Z' Shale, dark gray 5' Sandstone, gray, thin-bedded upper part calcareous, very fossiliferous; middle shale 5'6" Shale, very dark gray, slightly f
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