168 PROCEEDINGS OF THE AMERICAN ACADEMY. 



because this coast is further removed from its initial stage. Puget sound 

 (C. S., 6450, 6460) shows an irregular shoreline with many branching 

 bays, but much more work has been done in this locality since the 

 drowning to simplify the shoreline. Mr. Willis has shown* that this 

 Region is complicated by faulting. 



(3) Dissected Land comparable with Submerged Topography : Austrian 



Coast. In from the coast the land would have for its initial form one 



which is appropriate to the stage of the former cycle, which was inter- 

 rupted by the relative depression of the land with respect to the sea. 

 The whole region has been supposed to move together, so the streams fit 

 their valleys ; therefore if it were not for the many streams now pointing 

 into the same bay, " betrunked " and entering the sea independently, it 

 could not be told from their individual action in the present cycle that 

 their work had been diminished by the submergence. 



The type example of drowned longitudinal topography, now in an 

 exceedingly early stage of development since the initial submergence, 

 is the Adriatic coast of Austria (Austr., Zone 24, col. IX, X, XI; 

 25, IX, X, XI, XII; 26, IX, X, XI, XII; 27, X, XI, XII; 28, 

 XI, XII, XIII; 29, XI, XII, XIII; 30, XII, XIII, XIV; 31, 

 XIII, XIV). 



The cliffs on the more exposed land are older than where better 

 sheltered. It is a region of Mesozoic and Eocene strata of the Jura or 

 Appalachian type of folding, maturely dissected when drowned, into 

 whose longitudinal valleys tlie sea has entered, forming characteristic 

 drowned valleys of the longitudinal type, t In many places the slopes 

 intersect the sea level without a trace of having been attacked by the sea 

 since the depression. Following these slopes under water we sometimes 

 find them continuous with the unsubmerged portion, wliile in other places 

 the soundings indicate a rapid change from steep to gentle grades. A 

 detailed geological map with sections showing the structure of the Juras- 

 sic, Cretaceous, and other strata is needed to show whether these rapid 

 changes of slope under water are due to structure, to baselevelling, or to 

 aggradation during a slow depression. The central portions of the sounds 

 and channels bordered by the inner shoreline have broad flat areas 

 ranging in depth from 70 to «)5 meters. 



The general accordance of level of these bottoms suggests as the most 



* Chi. Jour. Geol., 1897, V. 99. 



t See various articles in Austrian journals by the following geologists: Bittner, 

 A.; Hauer, Franz Hitter v.; Hilber, V. ; Petermann, A.; Stache, Guide; Tietze, 

 Emil; and Toula, Franz. 



