. An introduction to geology : intended to convey a practical knowledge of the science, and comprising the most important recent discoveries, with explanations of the facts and phenomena which serve to confirm or invalidate various geological theories. e proper gres rovge : it isdesignated by M. Beaumont gres des Vosges; it approaches in itscharacter nearer to the gres bigarre than to the lower beds. Thevariegated sandstone, or gres bigarre, covers the gres des Vosges;but there appears to have been a considerable degradation of thesurface of the gres des Vosges, and also a disturbance of the b
. An introduction to geology : intended to convey a practical knowledge of the science, and comprising the most important recent discoveries, with explanations of the facts and phenomena which serve to confirm or invalidate various geological theories. e proper gres rovge : it isdesignated by M. Beaumont gres des Vosges; it approaches in itscharacter nearer to the gres bigarre than to the lower beds. Thevariegated sandstone, or gres bigarre, covers the gres des Vosges;but there appears to have been a considerable degradation of thesurface of the gres des Vosges, and also a disturbance of the beds bysubsidence or faults, before it was covered by the gres bigarre, orvariegated sandstone: nevertheless they are evidently members of thesame formation. 164 MUSCHEL KALK. In the beds of the gres higarre there are found thin beds and con-cretions of magnesian limestone; and above this is a more extensiveformation of smoke grey limestone called muschd-kalk, abounding inorganic remains. In this limestone, the beautiful fossil, the lily encri-nite, is found. (See the cut.) The muschel-kalk occurs also in Ger-many, but is entirely wanting in England. In its mineral character itbears a near resemblance to the limestone called lias, but it is sep-. arated from the lias of the Vosges by thick beds, corresponding withthe English red marl, but called by the French marnes irrisees, fromiheir spotted and variegated colours. The fossils in the muschel-kalk bear a nearer relation to those in the lias than to the shells inthe magnesian limestone below it: but neither belemnites nor gry-phites occur in this limestone in the Vosges. Its chief fossils are thelily encrinite, two species of ammonite, the terebratula subrolunda,and a species of muscle. According to M. E. Beaumont, were itnot for the intervention of the muschel-kalk, there would be a com-plete passage of the red sandstone into the red marl, as occurs inEngland. It deserves attention, that the lily encrinite has just beendiscover
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