U.S. Geological Survey Professional PaperU.S. Government Printing Office, 1974 - Geology |
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Common terms and phrases
90 km inland aeromagnetic amphibolite amplitude anomalies anoma anomalies associated anomalies shown anomaly bands Behrendt and Wotorson beneath the continental Bong Range Bouguer anomaly broad anomalies coastal anomaly coastal area continental shelf Contour interval correlation Cretaceous crustal diabase dikes Eburnean age province Eburnean province elevation emplaced faults foliation free-air anomaly g/cm³ geologic map gneiss gradient granitic granitic gneiss granitic rocks granulite gravity Greenville high-amplitude anomalies intrusions iron-formation Ivory Coast KILOMETERS Liberia Liberian age province linear anomalies Lofa River long-wavelength m.y. ago mafic magnetic anomalies magnetic data magnetic map map of Liberia map pl metasedimentary rocks mgal migmatite MILLIGALS Monrovia negative anomalies netic northeast northeast-trending northwest offshore Pan-African Pan-African age paragneiss positive anomaly R. W. White radiation level radioactivity data radiometric Range residual magnetic sedimentary rocks short-wavelength shown on plate shows Sierra Leone suggest survey terrane thick tion total magnetic intensity total-count ultramafic Voinjama White and Leo written commun