f r 



1 - 



A TABLE SHOWING THE PROBABLE FOREIGN EC 



ivau 



BRITAIN, 



Murchison and Sedgwick. 



Tilestones and 

 Downton Sand- 

 stones. 



Upper Ludlow 

 shales, Aymestry 

 limestone, Lower 

 Ludlow shale. 

 (Kendal group). ^ 



Wenlock lime- "1 

 stones, Wenlock 

 shale, Woolhope 

 limestone. (Den- [ 

 bighshire grits, j 

 and Tarannou 

 shales.) { 

 (Ireleth group), j 



Upper Llando- "] 

 very or May Hill 

 sandstone. | 

 (Coniston grits). \ 



FRANCE, 



De VerneuU, &c. 



^ SPAIN & PORTUGAL, 

 fcrl T>e. Vernmil, Bibeiro, &c. 



BOHEMIA, 



M. Jhirrande 



Light blue 

 shale and argil- 

 laceous schists, 

 with, cardiola and 

 graptolites, Serra j 

 de BussacQ, For- | 

 tugal. J 



Zone troisi^: 

 stages 11, G. 

 and E ; upper d[ 

 lower limestcfsj 

 and schists. 



Lower Llando- | 

 very sandstone, j 



Caradoc sand- 1 Ampelitic schists, 

 stone and Bala I conglomerates, and 

 PQgl^g 1 ferruginous sand- 



(Coniston group. ) j atones of La Sarthe. 



Llandeilo rocks. 



f Lingula flags, 

 Festiniog, Are- 

 nig, and Trema- 

 doc slates. {Stiper 

 stones,) Malvern 

 schists ? 



j Longmynd and "j 

 I Bangor rocks, 

 I Llanberris slates 

 1 and Harlech j 

 [grits. J 



Gneiss. 



Bluish schists of 

 Angers. 



Conglomerates, 

 and sandstones of 

 Brittany. 



Glossy schists of 

 Brittany. 



Gneiss. 



C Ochreous ar- ] 

 gillaceous rocks, j 

 with orthis, &c., 

 near Bussaco, 

 Portugal. 



Black schists, 

 with cardiola, 

 Sierra Morena 

 and South Py- 

 rennes, Spain. 



1^ Quartzites.mica 

 sandstones, car- 

 bonaceous schists 

 and limestones, 

 Serra de Bussaco, 

 Portugal. 



Schists, lime- 

 stones, and 

 quartzites of the 

 Sierra Moreaa, 



^ Spain. 



&3 



^ f Schists 



andl 



§2 



sandstones 

 1 the Guadarama 

 [_ Spain. 



C " Zone prirjr- 

 stage 



J 



I protozoic sch 



Unfossiliferous 1 

 argillaceous j 

 schists, with )- / Stages B 

 grits, near Bus- | I ^- Azoic sch 

 saco, Portugal. J 



Gneiss & Granite. Gneiss & Grtite 



p,„nw,,i^''''^,^"7,^'\'^*"il^i"=*'^*'^^ ^■"'^^^ '^""^'^^ °f gi-eenisli, talcose schists with quartz-veins (G 



OIn^l\^^^Kl y^„;/l^')•). These _upper beds contain Graptolites, Tri'.obites, Orthoceratites, and worm-like N 



In Norway the Azoi 

 In Australia, Mr. Sel 



line Grauwacke 

 Nereites. See ' Silu . 



c crystalline rocks are succeeded by saudstonesrschists7and flags (low^ Hmestonefith J) 



Iwynhas shown (Proc. Geol. Sec, March 10, 1858), that the Silui'iau rocks are well develo I, and 



