62 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 1 



within the 20-fathom line it is 3 miles long and 1% miles wide. The 

 pinnacle, Bishop Rock, is but 15 feet below the surface. Chart 32. 



This bank lies 36 miles off San Clemente Island and is the most 

 southerly bank of the group. 



Tanner Bank, lying 5 miles northeast of the northern part of Cortes 

 Bank, is not so large, 12% miles long, 5y 2 miles wide. The pinnacle has 

 12 fathoms of water over it. Charts 32, 33. 



Directly in line with Tanner Bank, 9 miles to the northwest of it, 

 is the third large bank, yet unnamed, 9 miles long and 3 miles wide. It is 

 17 miles south of San Nicolas Island. No part of it comes nearer to the 

 surface than 50 fathoms. 



Dredging has been done on each of these banks with fair success. 

 Much of the bottom is rocky, but there is also a large amount of sand 

 and finely broken shell. In some spots there is coralline. 



Point Loma is a narrow point of land extending directly southward 

 to shut off San Diego Bay from the open ocean. The mainland shore 

 extends in a regular, wide curve to the International Boundary, 10 miles 

 from Point Loma. San Diego Bay itself, 7 miles long, is shut off further 

 by a narrow spit that extends northwestward from the main shore, some 

 distance south of the city of San Diego. This leaves a shallow bay, mostly 

 with sandy bottom, outside the spit, extending southward from Point 

 Loma to beyond the International Boundary. Chart 34. 



The beam trawl and the small dredge have been used here in water 

 less than 10 fathoms, while dredging from the Velero III has been done 

 farther out, and in deeper water, about 80 fathoms, on a bank that lies 

 8 or 9 miles off Point Loma. 



Lower California — West Coast 



Plates 29-36; Charts 35-39, 41-45 



When the coast line crosses the boundary, it is trending directly 

 southward, and it continues much in this direction for 17 miles to Point 

 Descanso. At first much of the shore is sandy, but later bluffs up to 80 

 feet in height appear, with characteristic flat-topped hills in the back- 

 ground, Table Mountain being very distinctive. The shallow water 

 bench extends outward from shore from 8 to 12 miles, but from this to 

 deep water the change is quite abrupt. 



On this shallow water bench, 7 miles from shore and 5 miles south of 

 the boundary, are the Coronado Islands, with a southeasterly axis. North 

 Coronado is about one mile long, Middle Coronado consists of two small 



