Ground geophysics suggests that the major structure is an overturned anticline or syncline, closed to the east-northeast, and with the axial plane striking east-northeast - west-southwest and dipping steeply to the north. High magnetic and residual gravity anomalies are associated with minor synclinal crossfolds near the apparent nose of the major structure, and particularly on the northern limb. Recommendations are made for drilling six minor synclinal structures