. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. 9o DONALD C. BARTON amplitude of 250 gammas. Part, approximately half, of the steep north gradient and steep southerly decrease of Ag is regional and has no relation to the Ingolstadt structure. The gravity maximum is not as sharp or as flat topped as the magnetic maximum. Their respective shapes indicate that the extra dense mass is not co-extensive with the magnetically extra-permeable mass, but is somewhat larger and ex-. Fig. 8.—Observed variation of Az, Ingolstadt area. tends somewhat deeper. T
. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. 9o DONALD C. BARTON amplitude of 250 gammas. Part, approximately half, of the steep north gradient and steep southerly decrease of Ag is regional and has no relation to the Ingolstadt structure. The gravity maximum is not as sharp or as flat topped as the magnetic maximum. Their respective shapes indicate that the extra dense mass is not co-extensive with the magnetically extra-permeable mass, but is somewhat larger and ex-. Fig. 8.—Observed variation of Az, Ingolstadt area. tends somewhat deeper. The form of the magnetic anomaly indicates that the extra-permeable mass has a crudely disc-like form. Crude calculations in which the magnetic profile was treated as if it were a gravity profile indicate a depth to its top of approximately 3,000 feet and a thickness of approximately 800 feet for the disc. The high mag- netic permeability of the rock of the disc suggests a basaltic character. The Vohburg (C-10, Fig. 8), Weichering (D-o), and Strass (D-8) magnetic maxima are similar anomalies and presumably likewise rep- resent basaltic, probably laccolithic, intrusions (Figs. 3 and 10). 612. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Society of Exploration Geophysicists. Tulsa
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