4:24: 



LOWEE DEVONIAN. 



[Ch. XXVI 



Fie. 562 



kestored outline of head oi Brontes 

 fiabellifer 



X 



everal remains c Coccosteus 

 md they serve, as Sir K. Mur- 



Bronies flalelUfer. Goldf. Eifel; also S. Devon. 



stone," or " Eifel Limestone" of Germany, 

 and other ichthyohtes have been detected, 

 chison observes (Siluria, p. 

 371), to identify the rock 

 with the Old Red Sandstone 

 of Britain and Russia. 



Beneath the great Eifel 

 Limestone (the principal 

 type of " the Devonian" on 

 the Continent), lie certain 

 schists called by German 

 writers " Calceola-schiefer," because they contain in abundance a 

 brachiopod of very curious structure, Calceola sandalina (fig. 563). 



Calceola sandalina, Lara. Eifel ; also South Devon. 

 a. Ventral valve. &. Inner side of dorsal valve. 



fossil 



Loiver Devonian. 



Beneath the Middle Devonian limestones and schists already enumera- 

 ted, a series of slaty beds and quartzose sandstones, the latter constituting 

 the " Older Rhenish Greywacke" of Roemer, and the " Spirifer sandstone" 

 of Sandberger, are exhibited between Coblentz and Caub.* A portion ol 

 these rocks on the Rhine and in some of the adjacent countries were re- 

 garded a3 • Upper Silurian" by Prof. Sedgwick and Sir R. Murchison in 

 1839, but tiieir true age has since been determined. Their equivalents 

 are found in England in the sandstones and slates of the North Foreland 

 and Linton in Devon (No. 4 and 5 of the section, p. 420), and, ac- 

 cording to Mr. Salter, in the sandstone of Torbay in South Devon, 

 where many of the characteristic Rhenish fossils are m.et with. The 

 broad-wioged Spirifers 

 which distinguish the 

 " Spirifer-sandstein" of 

 Germany have their rep- 

 resentatives in the De- 

 vonian strata of North 



America (see fig. 564). Spirifer mucronatus,Yi.&\[. 



* Murchison's Siluria, p. 368, 



Fig. 564. 



Devonian of Pennsylvania. 



