HILL: GEOLOGY OF JAMAICA. 5 



PAGE 



First Appearance in the Jamaican Sequence of Land and 



Fresh-water jSIoUusks 1-^^ 



Fauna of the Cobre Beds l-J'-^ 



The Foraniinitera 15'5 



The Corals l->^ 



Fauna of tlie Pliocene Formations 104 



Definite Appearance of Reef Building Corals loi 



Pteropods and Brachiopods 154 



The Foraminifera 1^5 



Coral Fauna of the Elevated Reef 155 



Part IV. — Geologic and Topographic Evolution of the Island . . 15G 



Table showing Summary of the Island History 143 



Beginnings of Jamaican Geology 150 



Evidences of Vulcanism in Cretaceous Time 157 



Degradation in Eocene Time of the Volcanic Lands 157 



Evidences of Subsidence in Eocene Time 158 



Evidences of Orogenic Movement 158 



Tiie profound subsidence of Oligocene Time 158 



Contraction of the Island's Area 158 



Expansion of Land in Mid-Tertiary Time and Connection with Haiti . . 158 



The Laccolithic Intrusions of this Epoch 159 



Subsidence of the Bowden Epoch 160 



Restoration of Island to present Outline 160 



Progressive Emergences of Pliocene and Pleistocene Time 101 



Occupation of Emerging old Platforms of Erosion by growing Reefs . 102 



Summary of oscillatory Movements 103 



Resume of Orogenic Epochs 16-4 



Interpretation of tlie Dual Trends 104 



Estimates of the Amplitudes of Oscillation by Comparison of the 

 Rock Material with that of present Bathymetric Occurrence of 



similar Deposits lOo 



Part V. — Relations op the Jamaican Formations to those of Ad- 

 jacent Regions 108 



Regions of Comparison 108 



Evidences of Pre-Cretaceous Rocks in Cuba and Haiti 109 



Extent in the Great Antilles and Central America of Cretaceous Rocks 



and Fossils allied to those of Jamaica 170 



Their Absence in the North and South American Continents . . . 174 

 Wide Occurrence in the West Indies and along the Continents of Land 



Formations analogous to the Richmond Beds 175 



Peculiarity of the Occurrence of these Land derived Formations in 



Barbados 1~0 



Occurrence in the Antilles of Beds allied to the Cambridge Formation . 177 



The Relations of Montpelier Formations to those of the Vicksburg Epoch 179 



Wide Extent of Rocks of this Character deposited in an extended 



Area of Subsidence 1^0 



Extent and Relations of the Bowden Formation. Equivalents in the other 



Islands and Mainland 1^'^ 



Relations of the Pliocene Formations 1^5 



Extent of the Elevated Reef Phenomena 180 



Age of the West Indian Igneous Rocks 189 



Evidences of Pre-Cretaceous Crvstallines in Cuba and Haiti . . . 189 



