. Conodonts from the Glen Dean formation (Chester) of the Illinois basin. Conodonts; Paleontology; Paleontology. o Fig. 5.—Vienna South, locality 4. Abandoned quarry, west side of Highway 45, about miles south of junction of Highways 45 and 165 in Vienna, SE14 SEi/4 sec. 8, T. 13 S., R. 3 E., Vienna quad- rangle, Johnson County, Illinois. These are Hibhardella milleri, H. ortha, Lamhdagnathus jragilidens, Lonchodina furnishi, L. paraclaviger, Roundya costata, and Ozarkodina curvata. Abundance of the Fauna Conodonts are found in at least moderate abundance at all the outcrops sampled (50 to
. Conodonts from the Glen Dean formation (Chester) of the Illinois basin. Conodonts; Paleontology; Paleontology. o Fig. 5.—Vienna South, locality 4. Abandoned quarry, west side of Highway 45, about miles south of junction of Highways 45 and 165 in Vienna, SE14 SEi/4 sec. 8, T. 13 S., R. 3 E., Vienna quad- rangle, Johnson County, Illinois. These are Hibhardella milleri, H. ortha, Lamhdagnathus jragilidens, Lonchodina furnishi, L. paraclaviger, Roundya costata, and Ozarkodina curvata. Abundance of the Fauna Conodonts are found in at least moderate abundance at all the outcrops sampled (50 to 150 specimens per 1000 grams of raw sample is considered abundant). Alto- gether more than 4000 specimens were ex- amined and hundreds of representatives of many species were studied. Conodonts were found to be much more abundant in lime- stone than in shale. The most abundant species encountered were Neoprioniodus scitulus and Cavus- gnathus unicornis but they were closely fol- lowed in numbers by Ligonodina obunca and Spathognathodiis cr is tula. Among those also considered abundant are Cavus- gnathus convexa, Ozarkodina compressa, and Spathognathodus spiculus. With the exception of eight rare species, all others listed in table 1 occur commonly, but Cavusgnathus cristata, Gnathodus mo- docensis, Hibhardella milleri, Ligonodina hamata, and Neoprioniodus varians were found in slightly larger numbers than the others. Kladognathus prima, Lambdagna- thus jragilidens, and Lonchodina paraclavi- LOC. 5-HARRIS CREEK Limestone, gray, coarse-grained, cnnoidal, weathers to thin tan beds 19' Covered interval 6 6 Limestone, dark gray, medium to coarse- grained, crinoidal I4'8". ER Fig. 6.—Harris Creek, locality 5. Hillside above and below abandoned section of road, NW14 NWi^ sec. 15, T. 11 S., R. 9 E., Shawneetown quadrangle, Hardin County, Illinois. ger are very uncommon in the Glen Dean; Gnathodus ? sp., Kladognathus mehli, Lon- chodina furnishi, L. cf. L. paraclarki, Roundya
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