1854.] 



HAMILTON — MAYENCE BASIN. 



257 



Table of Signs. 

 [This map is taken fromM.F. Voltz's Geological Map of the Grand-duchy of Hesse.] 



Bunter Sandstone. 



;!i:'i'ii;!i';i'!'i;. Gravels. 



^ Lower Red Sandstone. 



Ossiferous sands. 



Littorinella limestone. 



Cerithium limestone. 



■lil^B 





■> Freshwater limestone. 



Coal-formation. 



Spirifer-sandstone. 



Taunus rocks. 



Greenstone. 



Marine clays. 



Marine sands & conglomerates. 



iiilllf 



111 



Porphyry. 



Outline of the formations. 



Description of the Strata, — The following Tabular statement of 

 the nomenclature of the deposits of the Mayence Basin, adopted in 

 this paper, will facilitate a reference to the Sections. 



C. Post-pliocene 



B. Tertiary 



'2. Loess. 



1. Gravel. 



'7. Ossiferous sand. 

 6. Upper or leaf-bearing sandstone. 

 5. Upper blue Brown-coal clay. 

 4. Littorinella-limestone. 

 3. Cerithium-limestone. 



2. Lower blue Brown-coal clay, or Cyrena- 

 clay. 



1^1. Marine sand and quartz-conglomerate. 



A. Carboniferous, or Lower"! -r, , j , p 



^ T> 1 ) iled sandstone, &c. 



A. Basement Rocks, 



Carboniferous, or Lower Red Sandstone. — The lowest tertiary de- 

 posit invariably rests, wherever its basis has been observed, on red 

 and yellow micaceous sandstone, which occurs as great underlying 

 spurs, particularly in the neighboui-hood of Weinheim and Flon- 

 heim, as seen in the sections, figs. 2, 3, 4 (see page 258) ; it forms 

 a portion of the Coal-measures, which are extensively developed round 

 the base of the porphyritic mountain of the Donnersberg. 



