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Geological and geochemical reconnaissance in the central Santander Massif, Departments of Santander and Norte de Santander, Colombia
James George Evans
1976, Open-File Report 77-281
The central Santander Massif is composed of Precambrian Bucaramanga Gneiss and pre-Devonian Silgara Formation intruded by Mesozoic quartz diorite, quartz monzonite, and alaskite and Cretaceous or younger porphyry. Triassic (Bocas Formation), Jurassic (Jordan and Giron Formations).and Cretaceous (Tambor, Rosa Blanca, Paja, Tablazo, Simiti, La Luna, and Umir Formations) sedimentary rocks...
Geologic interpretation of an aeromagnetic map of the west-central Columbia Plateau, Washington and Oregon
Donald A. Swanson, Thomas L. Wright, Isidore Zietz
1976, Open-File Report 76-51
A low altitude, total intensity aeromagnetic map of the ?west-central Columbia Plateau, underlain principally by the Yakima Basalt,. shows Positive and negative anomalies that stand out from a moderate intensity .background reflecting .interbedded flows of normal and reversed magnetic polarity. One set of anomalies is related to anticlinal ridges, nother...
Aeromagnetic map of Iowa
Water Resources Division, U.S. Geological Survey
1976, Geophysical Investigations Map 910
No abstract available....