TABLE OF CONTEXTS, PP. 



Page. 



Preface by the authors, vii 



InTRODU CTO RY C 1 1 APTE K. 



Vespertine group, (Pocona formation,) 3 



Its flora, 6 



Umbral sliale group, (Mauch Chunk formation, } . . . 9 



Conglomerate group, (Pottsville formation, ) 10 



Its flora, 11 



Lower productive coal measures, 15 



Their flora, IG 



Horizon of the Kittanning coal bed, 17 



Lower barren measures, 19 



Their flora, 20 



Upper productive coal measures, 21 



Upper barren measures, 24 



Three general sections, 29 



Chaptek 2. 



Description of ^2:)ecies. 



Equisetites, 33 



Calamites, 34 



Sphenophyllum, 3(i 



Annularia, 38 



Sphenopteris, 40 



Neuropteris, 40 



Odontopteris, '^2 



Callipteris 54 



Callipteridium, 55 



Pecopteris, 61 



( V pp. ) 



