DEVELOPMENT OF PALEOBOTANY IN THE ILLINOIS BASIN 79 



WOOD, J. M., 1963, The Stanley Cemetery flora (early Pennsylvanian) of Greene County, (P,c) 

 Indiana: Indiana Dept. Conserv. Geol. Survey Bull. 29, 73 p. 



WOOD, J. M., and J. E. CANRIGRT, 195^, The present status of paleobotany in Indiana (P,c) 

 with special reference to the fossils of Pennsylvanian age: Indiana Acad. 

 Sci. Proc. (1953), v. 63, p. 87-91. 



WORTREN, A. H. , i860, Remarks on the discovery of a terrestrial flora in the Moun- (M,c) 

 tain Limestone of Illinois: Am. Assoc. Adv. Sci. Proc, v. 13, p. 312- 

 313. 



ZALESSKY, M. D., 1910, On the discovery of the calcareous concretions known as coal 

 balls in one of the coal seams of the Carboniferous strata of the Donetz 

 Basin: Izv. Imp. Akad. Nauk (to 1917 ), P- ^77-^80. 



ZANGERL, R., and E. S. RICHARDSON, JR., 1963, The paleoecological history of two 

 Pennsylvanian black shales: Fieldiana, Geology, v. if, 352 p. 



ZIMMERMAN, R. P., and T. N. TAYLOR, 1970, The ultras true ture of Paleozoic megaspore (P,s) 

 membranes: Pollen et Spores, v. 12, p. ^51-^68. 



