Notices of Memoirs — Faulting in Rhine Valley. 229 



isTOTiCES OIF' Dvn:E3n^oiK.s, etc 



I, — ^Geological Observations in the District of the Ancient 

 Channels by which the Main and Neokar flowed intq 

 the Ehine near "Wiesbaden. 



" GeoLOGISCHE BeOBACHTUNGEN IM GeBIET DER ALTEN MiJNDUNGEN 



VON Main und Neokar in den Ehein." Voa A. Steuer. 

 (PLATE XI.) 



THE accompanying photographic plate gives a good example of 

 faulting in the Ehine Valley near Wiesbaden in the Pleistocene 

 period. The section in a large quarry south-east of Wiesbaden, south 

 of Mosbach, was photographed during a recent survey of the district 

 l)y Herr Steuer, but other instances had long been known. 



On the right-hand side are shown the Hydrobia deposits (Miocene) 

 covered by a thin layer of old river terrace, the Mosbach Sands. 

 The contrast between the hard calcareous beds and layers of marl 

 with Hydrobia brings out the faulting very clearly. On the left- 

 hand side a large ' wedge ' of the sands is let down 10 metres into 

 the underlying marls, bringing Pleistocene deposits sharply against 

 Tertiary. Many small faults may be seen both inside the wedge 

 and in other parts of the section. 



Diagram showing a large wedge of Mosbach Sands and Gravel of Glacial age, 

 which have been let down, by faulting, 10 metres into the underlying 

 marls of Miocene age with CorUcula and Hydrobia of the Mayence basin. 

 (See centre of Plate XI.) 



The Mosbach Sands have yielded Ursus spelaus, Eleplias primi- 

 genius, E. antiquus, Cervus canadensis, Alces latifrons, Rhinoceros 

 Merchi, Bison prisciis, etc. 



The old terraces of the Maine near its confluence with the Ehine 

 are divided into three. The earliest, corresponding to the Mosbach 

 Sands, is found at about 450 feet above the sea-level, or 200 feet 

 above the present river. But subsequent earth - movements have 

 displaced it to such an extent that it is occasionally seen 150 feet 

 below its normal level. The next terrace is not found in the special 

 district described by the author, but the third, and lowest, forms 

 a narrow belt along the river side not very far above the present 

 ■flood-levels. 



The' greatest earth-mdvenlents are believed to have taken place 

 between the formation of the second and third terraces, but from the 

 evidence given by the old channels in the youngest terrace it is 



