GRAVITY AND MAGNETIC INVESTIGATIONS IN SOUTH CENTRAL NEW YORK AND STEUBEN COUNTY
In the center of Steuben County northwest of Corning, NY is a gravity low. This simple Bouguer anomaly reaches a low of -58 mGal. The magnitude of the anomaly is 12 mGals and a gradient of 1.5 mGals/km. The anomaly is located in an area where the basement is buried beneath 3,500 meters of overlying Paleozoic sediment. The Marcellus Shale, a Middle Devonian black low-density shale extends into this area. Its low density would produce a gravel low as shown in central Steuben Co.
The magnetic map (J. Wallach) covers the area southwest of Lake Ontario between 42° 15' and 43° 30' north latitude and 75° and 77° west longitude. The magnetic anomalies originate in the PreCambrian basement. These anomalies are due to variations in the magnetic susceptibility or basement topography. The magnetic highs could indicate shallow basement or the upwarp of the overlying sedimentary rock. These upwarped areas may serve as oil or gas traps in the area.