[VALENTS OF THE SILURIAN AND CAMBRIAN ROCKS 

 RUSSIA AND THE 

 BA.LTIC PROVINCES, 



Miirchison, Pander, d-c. 



SCANDINAVIA, &c. 



Angelin, Muvchlson, d-o. 



NORTH AMERICA AND CANADA 



Hall, Bigsbij, Logan, &g., d'o, Bogers, 



[' Fish-beds and lime- 

 J stone. Oesel and 

 Esthonia. 



••{ 



Limestone with corals 



Prnlameriis limestone 



I<imcstone with corals 



Brandschiefer and 

 Pleta limestone 



Shaly & Sandy rocks. 



Calcareous flags, 

 Norway, 

 f (Upper Malmo group) 

 I Malmo limestone, 

 -{ Grraptolite schists, 

 I Orthoceratite lime- 

 [ stone. 



Regie E. Cryptony- 

 morum : limestones 

 with sandstones and 

 [ shales (Angelin). 



Coral limestone, 

 way. 



Nor- 



C (Lower Malmo group) " 

 UpperEncrinal schists 



I Coralline limestone, 

 Pentamerus lime- 



I stone, 



I Argillaceous schists, 



D. E. Ilarparum: 

 1 Schists, limestones, 

 y with marls (Angelin) . 



r (Oscarskal gi'oup) 

 J Calcareous sandstones 

 I Calcareous & argilla- i 

 [ ceous flagstones. 



Regio D. Trinucleorum : 



j ( KegioD.7 

 \ (Angelin) 



O CP 



r Graptolitic 

 schist, 

 Orthocera- 

 tite lime- 

 stone. 

 Regio C. Asaphonm : 

 B.C. Cer atopy g arum 

 (Angelin). 



Graptolite & Alum 

 schists, (Lower Oslo 

 group). 



RegionesB.A .• Co- 

 nocorypharum and 

 OUnorum. 



Aluminiferous 

 schists & black lime- 

 [ stones. (Angelin). 



f Quartzite & Schists. 

 \ Regio Fucoidarum. 



Gneiss. 



f Upper Pentamerus 

 limestone, Delthyris 

 shaly limestone. 

 Lower Pentamerus 

 limestone. 



Water-lime rocks, 

 Onondaga salt rocks. 

 Coralline limestone, 

 Niagara shales and 

 [ limestone. 



Post-meridian. 

 Meridian. 



Premeridian. 



Scalent. 



Clinton rocks Surgent. 



Medina sandstone ... Levant. 

 Oneida conglomerate 



Hudson River group, 

 Utica slate 

 Trenton limestone 



Matinf^l. 



c Black River limestone -> 



I Bird's Eye limestone 



j Chazy limestone r Auroral. 



1^ Calciferous sandstone j 



Potsdam sandstone, 

 700 ft. thick, Canada. 



Wisconsin and 

 Minnesota rocks, of 

 D. Owen. 



f Huronian rocks, of 

 I Logan, 



Laurentian (Logan). 



Primal. 



,R ter). These are overlaid by greywacke, sandstones, and slate, with subordinate beds of limestone and alnminiferons schist 



• 'ir 



ie th Pentameri (middle Sihirian), coralline limestone (Wenlock), calcareous flagstones (Ludlow ?), 

 and contain some fossils identical with those occumng in Britain. 



