A single gravity line was run along Rosecrans Boulevard for approximately 6 miles extending from Pacific Highway to approximately one mile north of the tip of the Poin Loma Peninsula. A 12 milligal anomaly on the northern, northeast trending pard of the traverse suggests a steeply northeastward sloping basement. The gravity anomaly supports previous data that the basement here has been downfaulted by a series of en echelon faults that represent an extension or branch of the Rose Canyon Fault Zone. Three addtional minor faults are also indicated on the gravity profile on the Point Loma Peninsula. The location of two of these agrees with those previously mapped. The third gravity indicated fault is unmapped.
