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Ordovicisches 

 System 



Silurisches System 





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J Untere Ab- 

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Obere Abthei- 

 lung 



(Caradoc) 



Untere Ab-j 

 theilung i 

 (Valentian) 



Mittlere Ab-I 

 theilung j 



Obere Abthei- 

 lung 





(d) Lower Tre- 



madoc 

 . (c) Dolgelly 



Group 

 (b) Festiniog 



Group 

 (a) Maentwrog- 



Group 



' (b) Arenig Series 

 of St. Davids 

 (a) UpperTrema- 

 doc 



! Llandeilo Series 

 I of Builth and 

 1 Abereiddy 



Hirnant andBala 

 Series of North 

 1 Wales 



(c) Tarannon 



Shales 

 (b) Mayhill- 



Sandstone 

 (a) Lower Llan- 



doverv 



(d) Ay mestry Limestone, (c) Lower 

 Ludlow, (b) Wenlock Rocks, 

 (a) Woolhope Beds. 



(c) Dowton Sandstone, (b) Bone- 

 Beds (a) Lower Ludlow 



Wales j Westengland v 



(b) Shineton Sha- 

 les 



(b) Olenus Shales 

 of Malverns 



(b) Arenig Rocks 



of Shelve 

 (b) Stiper Stones 



Llandeilo Flags 

 1 ofMeadowtown 



Caradoc Sand- 

 stone of Shrop- 

 shire 



(c) Purple Shale 

 and 



(b) Pentamerus- 

 Beds of 

 Shropshire 



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(b) Dictyonema- 



Schichten 

 (a) Olenus-Schichten 



(c) Orthoceras-Kalk 

 (b) Phyllograptus- 



Schiefer 

 (a) Ceratopyge-Kalk 



Trinucleus-Schiefer, 



Mittlere 

 Graptolitlienschiefer 

 I und 

 Chasmops-Kalk 



(d) Leptaena-Kalk 

 (c) Retiolites-Schich- 

 ten 



(b) Lobiferus-Schich. 



(c) Brachiopoden- 

 Schichten. 



Gothländer Mergel 

 und Kalk 



Gothländer Sand- 

 stein 





U S ö ö 



Ee' 

 und 

 Colonien 



CD 







Schiste 

 ardoise 



(b) Ampelit- 



Kalk 

 (a) Ampelit- 



Schiefer 







Potsdam-Gruppe 



Quebec 

 und 



Calciferous-Gruppe 



(d) Lorraine Schiefer 

 (c)Utica-Schiefer . 

 (b) Trenton-Kalk 

 (a) Chazy 



(c) Clinton 

 (b) Medina 

 (a) Oneida 



Guelph und 

 Niagara-Schichten 



Unter Helderberg- 

 Schichten 



Nordamerica 



