Geological Society of America Bulletin, Volume 89Geological Society of America, 1978 - Geology Vols. 1-44 include Proceedings of the annual meeting, 1889-1933, later published separately. |
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America Bulletin andesitic anorthosite Argillite assemblage basalt basement Basin batholith Bay of Islands beds belt berm Big Muddy Cove caldera carbonate Carnegie Ridge Cayman Cayman Ridge Cenozoic Coastal Complex Coiba continental correlation crustal deformation deposits depth dikes Durango east eastern Figure folds foliation Formation fracture zone gabbros Geol Geological Society Geophysical graben gradient grains granite gravity heat flow Holocene indicate interpretation intrusion Jour Lake late lavas layer mafic magma magnetic anomalies Malpelo margin metamorphic Mexico mineral northern oceanic crust ophiolite Ordovician Paleozoic Panama pillow plate Plateau pluton Precambrian quartz Quaternary region Rio Grande rift River samples scarps sediment sedimentary rocks seismic sequence serpentine serpentinite shale slope Society of America southern spreading center stratigraphic structure subduction suggests surface tectonic tephra texture thick tidal tion transform fault Trench trend tuff turbidites U.S. Geological Survey upper valley western World Island zircon