BIBLIOGRAPHY 
(1) Arnold, C.A. 1935 Contrib. Mus. Paleont., Univ. Mich. 4: 
279-282, 
(2) Benson, M. 1904 Ann. Bot., 18: 161. 
(3) Bunbury, C. 1847 Quart. Journ. Geol. Soc., 3: 425. 
(4) Chamberlain, C.J. 1935 Gymnosperms, p. 24. 
(5) Crookall, R. 1980 Ann. Bot., 44: 621-637. 
(6) Halle, T.G. 1929 Kungl. Svensk. Vetensk. Handl., Bd. 6 
No. 8. 
(7) Halle, T.G. 1933 Kungl. Svensk. Vetensk. Handl., Bd. 12 
No. 6. 
(8) Hirmer, M. 19382. Palaobotanik, Fortschritte der Botanik, 
Bd. 1. 
(9) Kidston, R. 1905 Proe. Roy. Soc. B. 76: 358-360 
(10) Lesley, J.P. 1889 Dictionary of Fossils of Pennsylvania p. 
606. 
(11) Lesquereux, L. 1880 Coal Flora Vol. 1. 
(12) Newberry, J.S. 1860 Geol. Rept. Ohio, Paleont., 6: 384. 
(13) Sellards, E.H. 1902 Am. Journ, Sci., 14: 196-198, 
(14) Sellards, E.H. 1908 Am, Journ. Sci., 16: 87-95. 
(15) Stockmans, F. 1933 Mem. Mus. Roy. Hist. Nat. Belg. No. 
Sie Ps 22, 
(16) see, Twenholfel, W. 1932 Treatise on Sedimentation (Rev. 
Ed.) p. 360. 
(17) Wodehouse, R.P. 1935 Pollen Grains p, 227. 
(18) Zeiller, R. 1883 Ann. Sci. Nat. (Bot.), ser. 6, Vol. 16. 
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