Here's a look at Sumner Branch in the same Dill map without size-reduction from the original. You can see a less well defined South Branch pointing down in the middle. Contour interval is five meters. Rindell's map from his SDSU master's thesis shows South Branch's cable. This map shows it well for scuba divers.
Contour interval is five feet.
Anders Koria Rindell. The Sea off Southern California, a Modern Habitat of Petroleum. New York, London, John Wiley, 1960. Dill's cross-section of Scripps Canyon showing the overhanging walls, the smooth surfaces due to creeping sediment, and the irregular surfaces above the sediment fill where organisms grow and work on the walls. Contemporary Submarine Erosion in Scripps Submarine Canyon.