. Collected reprints, Essa Institute for Oceanography. Oceanography 524 HEIRTZLER, BURCKLE, AND PETER cated. It is now evident that other depth esti- mates were made on the outer edges of anoma- lies and may be inaccurate. Seismic refraction measurements [A^itoine and Ewing, 1963] have been largely confined to the western part of Figure 4 where the magnetic anomalies are less well defined. There is no evi- dence of major disturbed horizons in the upper 5 km. Antoine and Ewing suggest that the km/sec horizon at about 5 km depth may be Paleozoic or Precambrian. Henderson [1963
. Collected reprints, Essa Institute for Oceanography. Oceanography 524 HEIRTZLER, BURCKLE, AND PETER cated. It is now evident that other depth esti- mates were made on the outer edges of anoma- lies and may be inaccurate. Seismic refraction measurements [A^itoine and Ewing, 1963] have been largely confined to the western part of Figure 4 where the magnetic anomalies are less well defined. There is no evi- dence of major disturbed horizons in the upper 5 km. Antoine and Ewing suggest that the km/sec horizon at about 5 km depth may be Paleozoic or Precambrian. Henderson [1963] has made a study of the gravity anomahes in the same area. To match observations with models he found it convenient to include a buried ridge 7 km deep at about 23 °N and 90°3(yW. With a minor redrafting of the mag- netic contours, an elongated magnetic high would occur at the position of the inferred ridge. The magnetic anomaly trend is nearly perpendicular to the gravity profiles and sup- ports the contention that structural trends are linear. However, Dehlinger and Jones [1965], using the same data, show a model for the gravity anomaly that does not include a buried ridge. The Rio Hondo fault zone in eastern Yucatan and gravity measurements in northern Yucatan [Murray, 1961] indicate trends paral- leling the magnetic trends north of Yucatan. Although no contours are shown to the east of Yucatan, it is believed that anomaly trends will not be particularly evident there. Various unpublished profiles in this locality indicate sharp magnetic features characteristic of vol- canic structures. Northeast Gulf area. Measurements in this area permit generalized anomaly contours to be drawn for the northern part of the West Florida shelf and for the Alabama coast and adjacent areas (Figure 5). The most prominent feature is an elongated positive anomaly striking nearly northeast-southwest across the edge of the West Florida scarp. This magnetic feature and other less pronounced tren
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