Scientific survey of Porto Rico and the Virgin Islands, Volume 1

New York Academy of Sciences

New York Academy of Sciences, 1922

Contents

• Introductory statement: 14
• Diorite porphyry sills: 20
• Geology of the San Juan District By Douglas R Semmes 33: 22
• Problems of the Survey: 24
• Bibliography: 29
• Valley of the Plata just below the power dam at K 19 Comerio Road: 39
• San Juan consolidated dune sand forming fringing islands at Vega Baja: 43
• The inner lowland and the iufaee of the cuesta at Corozal 411: 53
• Exfoliation producing concentric arrangements in ash beds south: 62
• Igneous Rocks: 76
• Typical foraminlferal shale: 77
• Rhyolltes: 82
• Soda granite showing poikilitic structure: 84
• Piorite porphyry with pyroxene phenocrysts in a groundniass of lath: 91
• Structural Features: 95
• Crossbedded structure in the San Juan formation at Areeibo: 97
• Mineral Occurrences: 102
• Page Introduction: 114
• Block diagram of Coastal Plain: 121
• Tuff beds: 131
• Character of the unconformity between the BarranquitasCayey and: 138
• Conglomerate with an igneous matrix 141: 144
• Lithlc tuff: 151
• Lithothamnion thallus in longitudinal section in Coamo Springs limestone 15i: 157
• 2: 163
• Valley of the Guamanl 16S: 169
• Olivine andesite: 177
• Olivine basalt 17l: 183
• Hornblendeaugite diorite 1811: 189
• VuIrani sin: 202
• Chlorite developing from feldspars which are associated with fresh augltes: 203
• Mineralization: 209
• Coamo Springs: 210
• Barrio del Carmen Prospect: 221
• INTRODUCTORY STATEMENT: 229
• Portion of Complex mountain province as seen from the Tertiary hills: 234
• Cuspated beach west coast Porto Rico just south of Melones Point: 246
• Fluted Guayabal limestone of Juann Diaz: 256
• Rio Yauco shale as seen from point one mile north of kilometer 15: 263
• Augite porphyrite showing zoned augite crystal set in finegrained ground: 274
• Clypvaster rosaceus Lamark: 283
• Montalva Salina west of Guanlca on south coast: 296
• The Physiography of Porto Rico By Arm in K Lobeck: 301
• Map showing the average annual rainfall in Porto Rico: 303
• Appalachian ridge structure in the oldiand rocks between Boqueron: 312
• Northsouth profile through Porto Rico: 318
• The inner lowland at Guanlca: 322
• The gorge of the Manati incised below the surface of the coastal plain: 330
• pen haystack belt between Barceloneta and Areclbo 35: 336
• Section of hill along Jacaguas River one mile southwest of Juana liaz: 343
• Lower course of the Descalabrado River during the dry season: 350
• The high terrace of the Plata River at K 13 on the Comerlo road: 351
• Tidal flats just east of Point Enibacaderos: 355
• River mouths at the north coast: 362
• The coast east of Quebradillas 3615: 369
• Part 1 September 26 1919: 375
• Geologic Map of the San Juan District Porto Rico: 383

Bibliographic information

• Title: Scientific survey of Porto Rico and the Virgin Islands, Volume 1; Scientific Survey of Porto Rico and the Virgin Islands, New York Academy of Sciences
• Author: New York Academy of Sciences
• Publisher: New York Academy of Sciences, 1922
• Original from: Princeton University
• Digitized: Mar 31, 2010