90 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 30 Ser. 



with the depth of 25 fathoms and less over the greater part, 

 as in the Anacapa and San Miguel passages. But into the 

 southern entrance of this channel a very marked submerged 

 valley intrudes, carrying the lOO-fathom curve into the 

 25-fathom plateau, while depths of 400 fathoms are shown 

 in two arms coming in from the E. SE, 



The general direction of the valley is parallel with the 

 southwest shore of Santa Cruz Island and is less than two 

 miles therefrom. The general direction is W. NW. (the 



head) and E. SE. The plateau of 50 fathoms on the Santa 

 Rosa side is out as far as the 400-fathom curve of the valley. 

 The bottom is fine gray sand out to 40 fathoms ; and 

 green mud in greater depths, except gravel and broken 

 shells in one sounding near the 200-fathom line. The 

 geographical position of the head of the valley in 25 fath- 

 oms is : 



Latitude 34° 00' N., longitude 119° 56' W. 



13. Northward of Cape Conception. 



North of Point Arguello for some miles the mountain 

 ranges lie parallel with the Santa Ynez range, and the streams 

 run through the intervening valleys to the ocean. The 

 lOO-fathom plateau is narrow, yet there are no indications of 

 any submerged valley breaking through it. 



14. The Sierra Santa Lucia. 



This mountain range presents the most compact and pre- 

 cipitous ocean barrier on this coast. It extends through one 

 degree of latitude NW.,from the canon of San Carpoforo to 

 Point Pinos in 36^ 38'. Midway it is accentuated by the 

 Twin Peaks that reach 5,020 feet elevation only 2^ miles 

 from the sea, and carries its height well to Point Sur, close 

 behind which rises Carmel Peak to 4,417 feet. This crest- 

 line is the outer of two parallel ranges, hardly ten miles 

 apart; the inner reaches 6,000 feet elevation east of the 



