I. INTRODUCTION 
During May 1957, a detailed aeromagnetic survey of a 38,000 
square mile area (fig. 1) off Cape Cod was conducted by Project 
MAGNET. Gontinuous total magnetic intensity (fig. 4) and inclina- 
tion data (fig. 5) were recorded with a Vector Airborne Magnetometer 
(Schonstedt and Irons, 1952), along tracks spaced approximately five 
miles apart (fig. 2). The flight altitude was 1000 feet, and navi- 
gational control, provided by Loran A, was maintained within two 
miles. This report presents the data from the survey, and an exam- 
ination of the geologic features which may contribute to the magnetic 
anomalies. 
The survey area covers the northwest end of the New England- 
Bermuda seamount chain (Northrop et al, 1960) and a portion of the 
continental margins associated with Georges Bank. Figure 3, based 
on relatively sparse sounding information, illustrates the general 
bathymetry. Computations involving the shape of seamounts however, 
are based on the more valid B.C. 0707N and B.C. O708N charts. As 
indicated on figure 3, the survey area is separated into 3 geographic 
zones, which display diverse magnetic characteristics. Zone 1 is 
characterized by large amplitude anomalies and includes the sea- 
mounts extending from Kelvin to Bear. Zone 2 has relatively small 
amplitude anomalies and contains the seamounts to the south of Zone 
1. Zone 3 generally defines the continental margins and is distin- 
guished by linear anomalies, parallel to the coast. 
