. Bulletins of American paleontology. 1 2 3 Average Corallite Dimension (mm). 5 6 7 Polygonality Text-figure 31. —Frequency distributions of average corallite di- mension (all corallites and those with six and more sides) and po- lygonality for one corallum of Paleofavosites sp. A. A, B, USNM 485947, Section-interval 6-1 (Plaines West). Both graphs represent the same transverse section; n = number of corallites (all), = coefficient of variation for all corallites. Occurrences. —hov^tr Lower Silurian (Lower Llan- dovery, upper Rhuddanian): Bowling Green Dolomite, noilheastem Mi
. Bulletins of American paleontology. 1 2 3 Average Corallite Dimension (mm). 5 6 7 Polygonality Text-figure 31. —Frequency distributions of average corallite di- mension (all corallites and those with six and more sides) and po- lygonality for one corallum of Paleofavosites sp. A. A, B, USNM 485947, Section-interval 6-1 (Plaines West). Both graphs represent the same transverse section; n = number of corallites (all), = coefficient of variation for all corallites. Occurrences. —hov^tr Lower Silurian (Lower Llan- dovery, upper Rhuddanian): Bowling Green Dolomite, noilheastem Missouri and west-central Illinois. Possibly in lower Lower Silurian (Middle Llandov- ery, lower Aeronian): Gun River Formation, Anticosti Island, Quebec. Material described above.—T'^o specimens: USNM 485942, internal 36-1, Bowling Green Dolomite, Sec- tion 36 (Indian Creek), Calhoun County, Illinois; USNM 485943, interval 17-la, limestone faciesat base of Bowling Green Dolomite, Section 17 (Clarksville), Pike County, Missouri. Paleofavosites species A Plate 19, figures 8-12 Description. —Coralla have tabular and low domical growth forms (Table 14). Size range is 47-115 mm wide and 14-40 mm high. In transverse sections, corallites appear as polygons of regular or slightly irregular shape (PI. 19, figs. 9, 11). The overall range of average corallite dimensions is mm; adult corallites commonly have av- erage corallite dimensions of mm (Table 19). Mean corallite areas on transverse sections are about 3—4 mm- (Table 19). On transverse sections, most cor- allites have regular sizes and have five to seven sides; corallites may rarely have up to nine sides (PI. 19, figs. 9, 11; Text-fig. 31 A, B; Table 19). Offsets are relatively rare, and commonly have three or four sides; sides were added during growth. There is little variation among the studied coralla in average corallite dimen- sions (Text-fig. 27). In longitudinal section, corallites are straight or s
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