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PROCEEDINGS OF THE AMERICAN ACADEMY. 



An example of a blocked stream of a different type from the Oceanside case is 

 seen in the Vistula (Germ., 70, 71, 99, 100). The sea here blocks the course of the 

 river and carries out its intention of a concave shoreline. The main work of the 

 river at present seems to be filling up Frische lagoon into which the main distribu- 

 taries have been turned, since the aggradation of the drowned valley. 



4 



t Kilometers. 



Figure 31. Blocked Stream : Oceanside, California. 



The delta of El Rincon river on the north side of the ridge south of which the 

 stream flows is an anomalous feature, until one perceives that in the contest be- 

 tween river intention and sea intention the latter has been victorious. A current 

 from the left flowing up the gulf of Dulce is indicated, such current having forced 

 the stream to turn a right angle around the point (H. O., 1036). 



Sea intention versus river intention is prettily shown at Coos bay, Oregon (C. 



