14 CONTENTS 



PAGE 



Intebpbetation of the Potomac Deposits 80 



Surface Configuration of Crystalline Floor and Its Rela- 

 tion to Potomac Basin of Deposition 86 



Surface Configuration of Potomac Deposits and Its Pos- 

 sible Interpretation 87 



Disteibtjtion of the Fauna and Flora 89 



The Geologic Peovince 96 



THE LOWER CRETACEOUS FLORAS OF THE WORLD. By Edwaed 



W. Beret 99 



the neocomian stage 101 



the baeeemian stage 127 



the aptian stage 135 



the albian stage 141 



general chaeactee and distribution 146 



CORRELATION OF THE POTOMAC FORMATIONS. Br Edward W. 



Beeet 153 



the european floras 159 



the trinity flora of texas 161 



the lakota flora of the black hills 162 



the fuson flora of the black hills 162 



the kootanie flora. 162 



the upper knoxville flora 164 



the horsetown flora 164 



general consideeations 165 



THE REPTILIA OF THE ARUNDEL FORMATION. By Richaed Swann 



Lull 173 



SYSTEMATIC 'PALEONTOLOGY, LOWER CRETACEOUS 181 



Veetebrata. Richard Swann Lull 188 



MoLLuscA. Wm. Bullock Claek 211 



Pteeidophyta. Edwaed Wilder Berry 214 



Cycadophyt.e. Edward Wilder Berry 313 



Gymnospeem^. Edwaed Wilbee Beery 370 



Monocotyledon.^. Edward Wilder Berry 452 



Dicotyledons. Edward Wilder Beery 457 



GENERAL INDEX 597 



paleontological index 605 



