. Bulletins of American paleontology. Ordovician-Silukian RuGost Corals: McAuley and Elias 31 but occurs in solitary rugosan coralla from many strati- graphic units and localities in the Red River-Stony Mountain and Richmond provinces (Elias, 1986b, ta- ble 1). Microborings about 5 ^m in diameter were observed in the outer wall of some specimens of Strcplclasma subregiilare {Savage. 1913b) from bioherms in the Lee- mon Formation at Section 19 (New Wells) (PI. 2, fig. 4), and possibly in one or two from the Leemon at Section 20 (Short Farm). These small borings could be algal or fungal (sec Bro
. Bulletins of American paleontology. Ordovician-Silukian RuGost Corals: McAuley and Elias 31 but occurs in solitary rugosan coralla from many strati- graphic units and localities in the Red River-Stony Mountain and Richmond provinces (Elias, 1986b, ta- ble 1). Microborings about 5 ^m in diameter were observed in the outer wall of some specimens of Strcplclasma subregiilare {Savage. 1913b) from bioherms in the Lee- mon Formation at Section 19 (New Wells) (PI. 2, fig. 4), and possibly in one or two from the Leemon at Section 20 (Short Farm). These small borings could be algal or fungal (sec Bromley, 1970, pp. 54, 55; Golubic, Perkins, and Lukas, 1975, p. 243). They occur beneath epizoic bryozoans in two coralla and beneath an algal coating in one, indicating that the borers became as- sociated with these hosts relatively early. Similar bor- ings have been reported in Richmondian solitary ru- gosan coralla from the Richmond and Red River-Stony Mountain provinces ( Elias. 1982a, pi. 9, fig. 20; Elias, 1982b, fig. 4h). A second type of microborings, with branches hav- ing highly variable diameters of up to 50 ^m, was probably produced by algae (PI. 4, figs. 1, 2). Such borings were observed in a few coralla of Streptelasma subregiilare (Savage, 1913b) from the Leemon For- mation at Section 20 (Short Farm), and from the Kis- senger Limestone Member of the Bryant Knob For- mation at Sections 18 (Kissenger), 17 (Clarksville), and 16 (Clinton Spring). All but one of the Kissenger spec- imens are from the basal coral-rich interval, and most are from Section 16. The exterior surface of the cor- allum was micritized in almost all cases, and the bor- ings occur beneath algal coatings in some individuals and within the calice in two. Such borings and asso- ciated micritization have not been observed in Rich- mondian solitary rugosan coralla. Orientation Virtually all of the solitary rugosan coralla found during this study were lying sideways within the strata, in what would
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