. Bulletins of American paleontology. Rugose Corals: McAuley and Elias Section 19 (New Wells), and were described by Ams- dcn (1974, pp. 21, 22: 1986, p. 33, pi. 4, tig. 1). Quart/ sand grains (Amsden, 1986, pi. 1, fig. 4) are most com- mon in the Illinois sections (Amsden, 1974, p. 24), and clasts of the Girardeau Limestone are generally present near the base. The Leemon Formation unconformably overlies the Orchard Creek Shale or, where present, the Girardeau. The Leemon is unconformably overlain by the Sexton Creek Limestone, which contains bands of chert nodules. Biota
. Bulletins of American paleontology. Rugose Corals: McAuley and Elias Section 19 (New Wells), and were described by Ams- dcn (1974, pp. 21, 22: 1986, p. 33, pi. 4, tig. 1). Quart/ sand grains (Amsden, 1986, pi. 1, fig. 4) are most com- mon in the Illinois sections (Amsden, 1974, p. 24), and clasts of the Girardeau Limestone are generally present near the base. The Leemon Formation unconformably overlies the Orchard Creek Shale or, where present, the Girardeau. The Leemon is unconformably overlain by the Sexton Creek Limestone, which contains bands of chert nodules. Biota Fossils from the Girardeau Limestone, including cri- noids and other echinoderms, brachiopods, bryozoans, gastropods, pelecypods, trilobites, cornulitids, and conodonts, were reported by Savage (1913a, pp. 358, 359: 1913b: 1917), Satterfield (1971), Brower (1973), Thompson and Satterfield( 1975, figs. 6,8), and IColata and Guensburg (1979). Solitary Rugosa are not known from the Girardeau. Pelmatozoans, brachiopods, bryozoans, gastropods, pelecypods, trilobites, ostracodes, conodonts, stro- matoporoids, tabulate corals, and solitary rugose corals have been reported from the Leemon Formation by the following workers: Savage (1913a, pp. 365, 366: 1913b: 1917 [the Cyrcne Member of the Edgewood Formation therein is the Leemon]), Amsden (1971b [the basal Edgewood /one therein includes the Lee- mon]: 1974: 1986, p. 33, figs. 23, 24, 26, 27). and Thompson and Satterfield (1975, figs. 7-9). In addi- tion, we recognize the siphonous green alga Dimorpho- siphon sp. in thin sections of samples from the for- mation at Section 20 (Short Farm) (PI. 8, figs. 2. 3) and a bioherm at Section 19 (New Wells). Several sol- itary rugosan coralla from Section 19 have algal coat- ings, and one has a boring we identify as Trypaniles sp. that was probably produced by a polychaete an- nelid. Microborings of algal and/or fungal origin occur in a few solitary coralla from Section 20 and in some from Sectio
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