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Rh Brongniart. Diet. Sei. Nat., vol. 57 (Prodrome), 1828, p. 74 (65). Fontaine & I. C. White : Second Geol. Surv. Pa., Rept. Progr. PP, 1880, p. 97, pl. xxxii, fig. 10. [Dunkard formation (Per mian).]

cf. Newberry. Ann. Sei., Cleveland, vol. 1, 1853, p. 165, text fig. 4. D. White: Bull. Geol. Soc. Am., vol. 6, 1895, p. 315. [Pottsville group; Quinnimont formation.]

cf. Lesquereux. Second Rept. Geol. Reconn. Arkansas, Philadelphia, i860, p. 310, pl. iii, fig. 2. D. White: Bull. Geol. Soc. Am., vol. i1, 1900, p. 165. [Pottsville group; Kanawha formation.]

sp. cf. (Sternberg) Corda. Beitr. Fl. Vorwelt, 1845, p- 29, pl- ix, ng- l9- P- White : Bull. Geol. Soc. Am., vol. 11, 1900, p. 165. [Pottsville group ; Kanawha formation.]

Fontaine & I. C. White. Second Geol. Surv. Pa., Rept. Progr. PP, 1880, p. 96, pl. xxxvii, fig. 3. [Dunkard formation (Permian).]

sp. D. White. Bull. Geol. Soc. Am., vol. 6, 1895, p. 315. [Pottsville group; Quinnimont formation.]

sp. D. White. Bull. Geol. Soc. Am., vol. 6, 1895, p. 318. [Pottsville group; Nuttall sandstone lentil of Sewell formation.]

(Sternberg) Unger. Gen. et. Spec. PI. Foss., 1850, p. 277. D. White: Bull. Geol. Soc. Am., vol. 11, 1900, p. 165. [Pottsville group; Kanawha formation.]

Dawson. Canadian Naturalist, Montreal, vol. 6, 1861, p. 168. Fon taine: Amer. Jour. Sei., 3rd ser., vol. 11, 1876, p. 379. [Pottsville group; Clark, Quinnimont and Sewell forma tions.]

Fontaine & I. C. White. Second Geol. Surv. Pa., Rept. Progr. PP, 1880, p. 97, pl. xxxvii, fig. 10. [Dunkard formation (Permian).]

sp. D. White. Bull. Geol. Soc. Am., vol. 11, 1900, p. 169. [Pottsville group; Kanawha formation.]

Fontaine & I. C. White. Second Geol. Surv. Pa., Rept. Progr. PP, 1880, p. 103, pl. xxxvii, figs, 11, 12. [Dunkard formation (Permian).]