REFERENCES 



39 



Heeklen Congress Compte Rendu; Congres 

 pour ravancement des Etudes de Strati- 

 graphie Carbonifere, Heerlen, 7-11 Juin 

 1927, Liege, 1928. Deuxieme Congres 

 pour ravancement des Etudes de Strati- 

 graphie Carbonifere, Heerlen, Sept. 1935, 

 3 vols., Maestricht, 1937-1938. 



HiRMER, M., Handbuch der Palaobotanik, 

 Band 1: R. Oldenbourg, Munchen und 

 Berlin, 1927. 



HiRMER, M., Uber Vorkommen und Verbrei- 

 tung der Dolomitknollen und deren 

 Flora: 1st Cong. Carb. Strat., Heerlen, 

 1927, pp. 289-312, 1928. 



HiRMER, M., Der Fossilinhalt der Dolomit- 

 knollen der Westdeutschen Paralischen 

 Kohlenbecken : pp. 154-158, in Kukuk, 

 P., Geol. d. Niederrheinisch - Westfal- 

 ischen Steinkohlengebietes, Berlin, 1938, 



HiRMER, Max, Die Pflanzen des Karbon und 

 Perm und ihre Stratigraphische Bedeut- 

 ung. Teil II: Die oberkarbon-Ploren der 

 Paralischen Becken des Westlichen 

 Mittel-Europa. Abschnitt 1: Paleonto- 

 graphica, vol. 84, abt. B, pp. 153-1&9, 1940. 



HosKiNS, J. H., and Cross, A. T., A considera- 

 tion of the structure of Lepidocarpon 

 Scott based on a new strobilus from Iowa: 

 Amer. Midland Nat., vol. 25, pp. 523-547, 

 1941. 



JoNGMANs, W. J., Comparison of the floral 

 succession in the Carboniferous of West 

 Virginia with Europe: 2nd Cong. Carb. 

 Strat., Heerlen, 1935, vol. 1, pp. 393-415, 

 1937. 



JoNGMANS, W. J., Die Kohlenfelder von Gross 

 Britannien: Geol. Bureau voor het 

 mijngebied Te Heerlen. Mededeelingen 

 Jaarvers. 1938-1939; pp. 15-222, Maas- 

 tricht, 1940. 



KiDSTON, R., On the fossil flora of the York- 

 shire coal field, 2nd paper: Trans. Roy. 

 Soc. Edinburgh, vol. 39, pp. 33-62, 1897. 



KiDSTON, R., On the internal structure of 

 Sigillaria elegans: Trans. Roy. Soc. 

 Edinburgh, vol. 41, pp. 533-550, 1905. 



KiDSTON, R., Les Vegetaux Houillers recueil- 

 lis dans le Hainaut Beige. Memoires du 

 Musee Royal D'Hist. Nat. de Belgique. 

 Vol. IV, (annee 1909); pp. 1-282, Feb. 

 1911. 



KooPMANs, R. G., Researches on the flora of 

 the coal-balls from the "Finefrau-Neben- 

 bank" horizon in the Province of Lim- 

 burg (the Netherlands): Geol. Bureau 

 voor het Nederlandsche Mijngebied. 

 Flora en Fauna van het Nederlandsche 

 Karbon; I pp. 1-53, Heerlen 1928. 



KuBART, B., Pflanzenversteinungen enthalt- 

 ende Knollen aus dem Ostrau-Karwiner 

 Kohlenbecken: Sitzungsber. d. K. Akad. 

 d. Wiss. in Wien, Math.-Naturw. Klasse, 

 Bd. 117, pp. 573-578, 1908. 



KuBART, B., Corda's Sphaerosiderite aus dem 

 Steinkohlenbecken Radnitz-Braz in Boh- 

 men: Sitzungber. d. K. Akad. d. Wiss. 

 in Wien, Math.-Naturw. Klasse, Bd. 120, 

 pp. 1035-1048, 1911. 



KuBART, B., Uber die Cycadofilicineen Heter- 

 angium und Lyginodendron aus dem 

 Ostrauer Kohlenbecken: Osterreichische 

 Bot. Zeitschrift, Jahrg. 64, pp. 8-19, 1914. 



Lang, W. H., Preliminary statement on the 

 morphology of the cone of Lycopodium 

 cernuum and its bearing on the affin- 

 ities of Spencerites: Proc. Roy. Soc. 

 Edinburgh, vol. 28, pp. 356-367, 1908. 



LeClercq, S., Les Coal-Balls de la Couche 

 Bouxharmont des Charbonages de Wer- 

 ister: Mem. de la Soc. Geol. de Belgique, 

 pp. 1-79, Liege, 1925. 



LeClercq, S., Sur un Sigillariostrohus heter- 

 ospore: Sigillariostrobus sphenophyl- 

 loicles n. sp.: Bull. Soc. Geol. Belgique, 

 vol. 61, pp. 164-170, Liege, 1938. 



Lesquereux, Leo, Description of the coal 

 flora of the Carboniferous formation in 

 Pennsylvania and throughout the United 

 States: Atlas, 1879; vols. 1 and 2, 1880; 

 vol. 3, 1884; Harrisburg, Pa. 



LuGN, A. L., Geology of Lucas County: Iowa 

 Geol. Survey vol. 32, pp. 101-237, 1927. 



Mitchell, Gertrude, Contributions towards 

 a knowledge of the anatomy of the genus 

 Selaginella, Spr., Part V: Ann. Bot., vol. 

 24, pp. 19-34, 1910. 



Moore, R. C, Stratigraphic classiflcation of 

 the Pennsylvanian rocks of Kansas: 

 Kansas Geol. Survey Bull. 22, pp. 1-256, 

 1936. 



Moore, R. C, Comparison of the Carbonif- 

 erous and early Permian rocks of North 

 America and Europe: 2nd Cong. Carb. 

 Strat., Heerlen 1935, vol. II, pp. 641-676, 

 1937. 



Nemejc, F., The sequence of the floras in 

 the limnic coal districts of Bohemia and 

 the limits between the Westphalian, 

 Stephanian, and Permian: 2nd Cong. 

 Carb. Strat., Heerlen 1935, Vol. II, pp. 

 683-702, 1937. 



Newton, W. A., and Weller., J. M., Strati- 

 graphic studies of Pennsylvanian out- 

 crops in part of Southeastern Illinois: 

 Illinois Geol. Survey, Rept. of Inv. No, 

 45, 1937, 



