Memorias, Edició 2

alunite andesite anomalies Aymamón Bahamas Barranquitas quadrangle bauxite beach rock beds Blue Mountain breccia British Guiana calcaires Caribbean cations Chubb clay coastal Colombia conglomerates coral correlation Cretaceous Cuba deposits diorite early earthquake east eastern Eocene erosion fault fauna feet foraminifera fossils gabbro Geol Geological Survey Department geologists geosyncline Globorotalia granodiorite ground water hydrothermally altered rocks industrial intrusion iron Island Jamaica kaolinite Kingston late lateritic lateritic material limestone lower magnetite Mayagüez metamorphic middle Miocene mineral Miocene mollusks occur Oligocene outcrop Peneplain percent Plain pluton Ponce porphyry presqu'île probably Puerto Rico Pyrophyllite quartz reef region Report rept Río River Roraima Roraima Formation rudists sample San Juan San Sebastián sand sandstones saprolite sediments shales south coast species standard cell structure surface Surv Takutu Tertiary thickness tion tuff tunnel U.S. Geological Survey Valley Versey volcanic weathering Woodring Zans zone