6 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



PAGE 



Extent of Vulcanism in Cretaceous Time 192 



Extent of Tropical Vulcanism in Eocene Time 192 



Tlse extent of the Antillean Mid-Tertiary Vulcanism 195 



Exceptional Volcanic Features of the Windward Islands 195 



Pabt VI. — Changes of Fhysiograpuy ix Tropical America bearing 



UPON THE History of the West Indian Islands 198 



Groups of Data upon which Analysis of West Indian History is dependent 198 

 Difficulties surrounding the Interpretation of the Submerged Configura- 

 tion 199 



Testimony of the Geologic Structure and Configuration of the Land 



Areas 199 



Vagueness of Pre-Cretaceous History 200 



Areas of Pre-Cretaceous Rocks 200 



Hypothetical Evidence of an eastward Extension of the Continents in 



Jurassic Time 200 



Testimony of the Fossils indicating a Continental Barrier in Jurassic 



Time 201 



Hypothetical Evidence of the Existence of a Windward Bridge or 



Isthmus in Jurassic Time 201 



The Influences of the Revolution at the Close of the Jurassic Time . . 202 

 Evidences of extensive West Indian Lands 'n Cretaceous Time .... 203 

 Migrations of the Sea Borders across Mexico in Lower and Upper Creta- 

 ceous Time 203 



Decadence of the Windward Bridge 204 



The Closing of the Panama Bridge 205 



The Influence upon the West Indian Region of the Laramide Revolution 206 



Wide Extent of the Eocene Degradation 207 



Extent and Influence of the Vicksburg Subsidence 209 



The Ephemeral Reopening of the Panama Passage 210 



Disappearance of pre-existing West Indian Lands 210 



The Mid-Tertiary Antillean Orogenic Revolution 210 



Extent of its Diastrophic Influences 211 



The Expansion and Connection of the Antillean Islands 213 



Influence upon the Submarine Configuration 214 



Dismemberment of the expanded Antillean Land in the Bowden Epoch . 214 



The Progressive Elevations from Pliocene to Recent Time 215 



Interpretation of the Differential Movements by Comparison of the Ter- 

 race Levels 216 



Probable Participation of the Antillean Region in the Lafayette Move- 

 ments of the North American Coastal Plain 217 



Extent and Field of the Pleistocene and recent Uplifts as recorded by the 



Elevated Reefs 218 



Proofs of Differential Movement in these Epochs 219 



Post-Pliocene Uplifts insufficient to connect the West Indian Islands 



with the Mainland or with each other 220 



Rt'sumc of West Indian Geographical History 220 



Part VII. — ArPKNnicRS 225 



Appendix 1. Achlitional Note on tlie Geology of Porto Rico 225 



Appendix 2. Report upon the Fossil Corals of Jamaica, by T. Wayland 



Vaughan 227 



List of Tkxt Fh;uki.s 251 



Explanation of the Plates 252 



