A possible structure of the earth's crust across Campeche Escarpment, Gulf of Mexico, was resolved by utilizing the gravity measurements made on the A&M College of Texas Research Vessel HIDALGO and by combining these data with published seismic information. The La Coste-Romberg surface-ship gravity meter S-9 of A&M College, owned by the Office of Naval Research, was the gravity instrument used. The method used herein effectively reduces an infinite number of possible structures to a few possible structures. A total of 915 km of continuous gravity profile was traversed from June 29 to July 1, 1961. Accuracy of the gravity profiles appears to be satisfactory for this kind of crustal investigation. This report is intended as a basis for further studies; no attempts were made to ascertain the geologic events in detail. From this investigation it appears that the escarpment is nontectonic in origin, although the possibility of a crustal fault below the escarpment cannot be ignored.