Geol.— Vol. I.] DA]'IDSOX~SUBMERGED VALLEYS. lOI 



the general line of the coast, It is a high, rocky cliff, 

 backed by a cluster of hills, which reach i,8oo feet eleva- 

 tion in two or three miles. Seven miles to the northward a 

 deep, narrow canon breaks upon the low shore; but there 

 are no indications of a submerged valley off it. 



The submerged valley heads close under the west side of 

 the cliffs forming the point and is parallel with them. The 

 50-fathom curve reaches i^ miles north of the point and 

 i^ miles broad off the shore. From this head the valley 

 runs to the south 2^4 miles to the 200-fathom curve, then 

 gently curves to the southwestward to 358 fathoms in a total 

 distance of 45^^ miles. It is comparatively narrow. 



The lOO-fathom plateau lies eight miles from the north 

 shore of the point and about the same distance to the south 

 of that point. The 358-fathom sounding lies on the normal 

 line of the 55-fathom curve of the lOO-fathom plateau. 



The character of the bottom in the valley is not noted; 

 but "rocky" and "fine sand" are given on the north 

 plateau, and fine sand on the south. 



The soundings are not carried beyond the 358 fathoms, 

 but at 28 miles S. 20° W. from the point one depth is given 

 at 2,155 fathoms. There are no topographical features of 

 the coast which would suggest this submarine valley. 



4. The Todos Santos Submerged Valleys. 



For a distance of 30 miles (from latitude 31° 30' to lati- 

 tude 32° 00') the normal loo-fathom line is intruded by 

 irregular depths of 500 fathoms. One broad submerged 

 valley, 370 to 50 fathoms deep, stretches in six or seven 

 miles to the southeast into Soledad Bay, at 31° 35' latitude. 

 The submarine projection of Santo Tomas Point, which 

 forms the southwest side of Soledad Bay, stretches out 

 seven and one half miles, with only 50 fathoms of water; 

 this forms the south side of the submerged valley. 



A narrow submerged valley passes between Point Banda 

 (31° 45') and the Todos Santos Islands, and carries 200 

 fathoms at the gorge-like entrance. Inside the bay or gulf 



