ILLUSTKATIONS 



XI 



ILLUSTRATIONS 



Plates 



Page 



Plate • 1— Dake : Portrait of Guy H. Cox 15 



2 — Gregoky : Portrait of Josepli Barrell 18 



3 — Leyerett : Portrait of James E. Todd 44 



4 — KEini : Geologic map of Appalachian region 309 



5 — Kindle : Concretions 648 



6 — " Concretions 648 



7 — " Concretions , 648 



8 — " Concretions 648 



9— " Concretions 648 



10 — " Concretions 648 



11 — " Concretions 648 



12 — - " Concretions 648 



Schuchert : 

 Figure 



Figures 



1 — Geosynciines, lands, and oceans or mediterraneans dur- 

 ing late Proterozoic time 213 



2 — North America in early Proterozoic time 214 



3 — Borderlands, geosynciines and embayments, and neutral 



areas of Paleozoic time 215 



4 — Geosynciines of late Lower Cambrian time 216 



5 — Geosynciines and their extensions of Upper Cambrian 



and Canadian time 217 



6 — Geosynciines and embayments and Arctic Sea of Ordo- 



vician time 218 



7 — Geosynciines and embayments and Arctic Sea of Silu- 

 rian time 219 



8 — Geosynciines, embayments, and their extensions during 



Devonian time 220 



9 — Cordilleran geosyncline and Mississippian Sea of early 



Mississippian time 221 



10 — Seas and embayments of late Mississippian time 222 



11 — Seas and coal swamps of early Pennsylvanian time .... 223 

 12 — Cordilleran, Mexican, and Franklinian geosynciines ; 

 Mississippian Sea and coal swamps of late Pennsyl- 

 vanian time 224 



13 — Pacific geosyncline, Arctic and Mexican seas of late 



Triassic time 225 



14 — Pacific and Mexican geosynciines and Logan Sea of 



early Upper Jurassic time 226 



15 — Californian, British Columbian, and Mexican geosyn- 

 ciines of Middle Cretaceous (Alf)ian) time 227 



16 — Great Kocky Mountain and narrow Pacific geosynciines 

 and Gulf of Mexico overlap of early Upper Cretaceous 

 time 228 



