. Bulletins of American paleontology. Ordovician-Silurian Colonial Corals: Young and Ell\s 11. ALEXANDER COUNTY SECTION 20 (SHORT FARM) Text-figure 4—Locality map (C) and stratigraphic sections (to scale) in southern Illinois and southeastern Missoun (see Text-fig. 1 A, foldout inside front cover). For legend, see Text-figure 1B. For references and precise locations of sections, see Appendix (p. 104); for information on Sexton Creek corals in Alexander County, see text. as lowermost Clear Creek Limestone therein); Lyellia thebesensis (Foerste, 1909, p. 95); and L. thebesensis, Calvinia edgewoo
. Bulletins of American paleontology. Ordovician-Silurian Colonial Corals: Young and Ell\s 11. ALEXANDER COUNTY SECTION 20 (SHORT FARM) Text-figure 4—Locality map (C) and stratigraphic sections (to scale) in southern Illinois and southeastern Missoun (see Text-fig. 1 A, foldout inside front cover). For legend, see Text-figure 1B. For references and precise locations of sections, see Appendix (p. 104); for information on Sexton Creek corals in Alexander County, see text. as lowermost Clear Creek Limestone therein); Lyellia thebesensis (Foerste, 1909, p. 95); and L. thebesensis, Calvinia edgewoodensis Savage, Favosites subelongus Savage, and Calapoecia favositoidea Savage (Savage, 1913, pp. 20, 24; 1917, pp. 78, 82; Edgewood For- mation therein). Lyellia thebesensis and C. edgewood- ensis have been reported from the Leemon at the Gale Section (Savage, 1913, p. 21; 1917. p. 79; Edgewood Formation therein). They were referred to as Plas- mopora thebesensis (Foerste) and Heliolites? edge- woodensis in Savage (1910, p. 333). Based on studies of our own collections as well as those of Foerste and of Savage, we recognize the fol- lowing species in the Leemon Formation: Propora the- besensis. Pwpora savagei. Propora speciosa (Billings), Acidolites sp. A, Halysites alexandricus. Paleofavosites subelongiis, and Rhabdotetradium sp. A. Calvinia ed- gewoodensis is a synonym of P. speciosa (see Discus- sion, pp. 60, 61), and Calapoecia favositoidea is a syn- onym of P. subelongus (see Discussion, p. 87). The distribution of these corals is shown in Text-figure 4. We did not find colonial coralla in the Leemon at Section 19 (New Wells). Favosites favosus and Halysites catenulatus [sic] (Linnaeus) were identified previously from the Sexton Creek Limestone at a locality km south of Section 31 (Thebes North) (Savage, 1913, p. 16; 1917, p. 74). We recognize the following colonial corals in Savage's collections from that unit in Alexander County, Illi- nois: Propora sp. A, Halysit
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