POSTGLACIAL, &-r., DEPOSITS OP CONTINENT. 475 



hypothesis of a violent rush of waters, caused by a sudden down- 

 ward movement of the ground, to explain the formation of the 

 Jaravallen. The accompanying illustration kindly sent me 



Fig. 13.— £, Till ; c, Stratified glacial clay; 5, Silt with recent shells ; B\ Old 

 "beach ; B 2 , Beach now forming. . 



by Mr. Tornebohm, will show the general features presented by 

 the beach-gravels. 



Some interesting descriptions of raised-beaches on the coasts 

 of Scania are given by Mr. E. Erdmann. 1 He mentions among 

 others that which occurs near Helsingborg at a height of 10 to 

 15 feet above the present sea-level. The succession of beds in 

 this beach he gives as follows : — 



1. Beach-accumulations of sand and gravel with cockle- and mussel- 



shells, 3 feet to 3 feet 5 inches. 



2. Peat, 5 inches. 



3. Yellowish-gray silt with recent freshwater-shells, such as Planorbis 



complanatus, L., Bithynia tentaculata, L., Limncea limosa, L., 

 (3 ovata-normalis, etc., 1 foot 5 inches. 



4. Peat with branches, stools, and roots of oak, 1 foot. 



5. Loamy or clayey silt, freshwater, 1 inch. 



6. Bluish-gray calcareous glacial clay, very thick. 



At many other localities similar successions are met with at 

 like low levels. Thus at Barseback, not far from Landskrona, 

 at a height of 10 to 15 feet above the sea occur ancient sea- 

 beaches which show the following structure : — 



1. Beach-gravel and sand with Mya truncata and Cardium edule, 



4 feet. 



2. Decayed peat, 1 foot to 3 feet 5 inches. 



3. Beach gravel 



4. Grayish-blue boulder-clay or till. 



Mr. Xathorst has also made some recent additions to our 

 knowledge of the raised-beaches which occur at low levels on 



1 "Bidrag till fragan om Skanes nivaforandringar, " Geologiska Foreningens i 

 Stockholm Fbrhaadlingar, Band i. No. 6. 



