222 PROCEEDINGS OP THE AMERICAN ACADEMY. 



Other Examples. — The larger streams in the Puget sound region, notably the 

 Skokomish, de Cliate, Nisqually, Puyallup, and Snohomish (C. S., 6450, 6460, 

 690, 644). 



The Tay river has filled about half of the valley which the firth occupied after 

 the depression (Scot., 48). 



Kyle of Durness and kyle of Tongur (Scot., 114). 



Euel strath (Scot, 29, 37). 



Sachaig strath (Scot., 37). 



Clyde delta (Scot., 38). 



Carron delta (Scot., 92). 



Torridon delta (Scot., 91, 92). 



Scotland gives also many other examples. 



Bilbao ria is partly filled (Spain, Vizcaya, 1892, Lam. 1; Spain, Bol. 111,1865, 

 Lam. D). 



Mobile bay is being rapidly filled by waste from the Alabama rivers, although 

 tlie delta front is some 30 miles from the mouth of the bay (C. S., 188). 



The ria-delta in Irondequoit bay is not so far advanced as the Dwamish, and is 

 perhaps on the border line between the periods of youth and adolescence. The 

 mouth of tlie bay is closed by a bay-bar, so the stream will be able to push 

 forward its delta undisturbed by tlie waveS of lake Ontario. 



Halkjaer (Deiim., Nibe). 



Kanders (Denm., Mariager). 



Vejle is built on the delta growing forward into Vejle fjord (l)enm., Fredericia). 



The stream emptying into Kands fjord (Denm., Fredericia). 



Several streams entering into Odense fjord (Denm., Ilindsholm, Nyborg). 



Quieto and Dragogna rivers, Austria (Austr., 24, IX). 



Arsa delta, Austria (Austr., 25, X). 



Bado delta, Austria (Austr., 26, X). 



In St. Jordals fjord (Nor., 47, C). 



Ler river (Nor., 15, C). 



The Dniester (Rus., 33). 



Tlie Gedis delta in Asia Minor (Brit. Ad., 1523, Map II, Dr. C. Cold, Kusten- 

 veranderungen im Archipel, Miinchen, 1886) has grown, even in historical times, 

 into the gulf of Smyrna, and will soon geographically cut in two the harbor of 

 Smyrna and leave that city without communication with the ^gean sea. 



The above mentioned catastrophe has happened to Ileraclea and other places 

 south of Smyrna on the coast of Asia Minor, where the Ma;ander has nearly filled 

 its ria (Brit. Ad., 1555; Cold, loc. cit.. Map III). 



Type Mature Bay-delta : Simeto, Figure 28. — South of the volcanic 

 mass of Etua, the three rivers Simeto, Dittaiuo, and Gorna Lunga have 

 built a common flood plain and delta of recent alluvium. This is a 

 beautifully mapped illustration of the ideal form of a delta-filled bay 

 (Ital. and Sicily, 269, 270, 273, 274). The filling may have been 

 contemporaneous with a slow sinking of the region, or the space now 

 occupied by the flood plain may be simply what was not filled with the 

 lava. The form is so typical however that it is given as the best mapped 



