194 



University of California. 



[Vol. 2. 



similar to the coves of Catalina are found on Santa Rosa at the 

 mouths of a number of the stream valleys, and present evidence of 

 submergence as unmistakable as in the case of Santa Catalina. 

 Lagoons, also, are to be found at the mouths of several of the 

 stream courses, where drifting sand is abundant. 



Santa Cruz Island, a little to the east of Santa Rosa, is the 

 largest of all the islands of the two groups. It consists, like Santa 

 Catalina, of a larger and a smaller division connected by a narrow 

 neck. The larger division, comprising about two-thirds of the 

 length of the island, has an average width of six and a half miles, 

 the narrower portion averaging about three miles in width. The 

 total length of the island is a little over twenty-three miles. The 

 smaller division, including the neck, has a prominent axis, having 

 the same trend as this part of the island, and nearly centrally 

 situated. It is crossed by a prominent transverse axis a little over 

 three miles from the eastern end of the island. The western and 

 larger division shows two principal ridges, running parallel with the 

 general trend of the island. The northern and higher ridge 

 extends the entire length of this portion of the island, and not far 

 from its middle point is connected with the southern ridge. 

 The latter at its eastern extremity is connected by a short spur 

 with the axis of the smaller division. Along the length of the 

 last two ridges, taken together, we find the following altitudes 

 given for prominent points, on the small hachured map of the 

 U. S. Coast and Geodetic Survey, 1,329 feet, 1,374 feet, 1,496 feet, 

 1,549 feet. On the northern ridge the altitudes i,8oo feet, 2,407 

 feet, and 2,144 feet are given. Unfortunately, the writer had access 

 to no larger map of Santa Cruz than this (scale 1:200,000), so that 

 no statement can be made as to the uniformity of altitude of the 

 summits. 



The northwestern part of the island presents topographic forms 

 closely resembling those of Santa Catalina. The central, southern, 

 and eastern portions, however, show few or no branches on the 

 streams flowing from the main divides, the forms being long, 

 simple, and trough-like. The effect of the whole is of a generally 

 rugged, mature topography, developed in rather resistant rocks. 



