106 



TABULAR VIEW OF THE FOSSHJFEROUS STRATA. [Ch. LX. 



25. 



UPPER 

 SILURIAN. 



26. 



MIDDLE 

 SILURIAN. 



27. 



LOWER 

 SILURIAN. 



28. 



UPPER 

 CAMBRIAN 



te 

 < 



S 



(Primordial zone 



of Barrande). 





29. 



LOWER 





CAMBRIAN 





(Longmynd 





Group). 





30. 



1 



UPPER 



LAUREN- 





TIAN. 





31. 



«3 



LOWER 



LAUREN- 





TIAN. 



EXAMPLES. 



British— Upper Ludlow formation, Downton sandstone, with 

 bone-bed in the upper part; gray sandstone with Bhyncho- 

 nella avicula (pp. 551-553). 



Lower Ludlow formation, comprising Aymestry limestone and 

 Ludlow shale, with oldest known fish remains (p. 553). 



Wenlock limestone, with trilobites, &c. (p. 557). 



"Wenlock shale, with graptolites (p. 559). 



"Woolhope limestone and grit (p. 560). 



Foreign — Niagara limestone, with Calymene, Homalonotus. &c. 

 (p. 571). 



British — Upper Llandovery, comprising Tarannon shale and 

 May-hill sandstone and limestone, with Pentamerus lewis, 

 &c. (p. 560). 

 Lower Llandovery slates (p. 561). 



Foreign — Clinton group of America, with Pentamerus Icevis, &c. 

 . (p. 571.) 

 Silurian strata of Eussia, with Pentamerus (p. 569). 



British — Caradoc and Bala beds, with Trinucleus Caractaci, &c. 

 (p. 562). 

 Llandeilo flags, with graptolites and interstratified volcanic 



tuffs (p. 565). 

 Lower Llandeilo or Arenig formation, with Didymograpsus 

 geminus, and interstratified volcanic tuffs (p. 567). 



Foreign — Ungulite or Obolus grit of Eussia (p. 569). 

 Hudson Eiver group and Trenton limestone of North America, 

 with Trinucleus, &c, and Black Eiver limestone, with large 

 Orthoceras (p. 571). 

 Orthoceras limestone of Sweden (p. 572). 



British — Tremadoc slates, with trilobites of genera, partly Silu- 

 rian, partly " primordial of Barrande " (p. 576). 

 Lingula flags with Lingula Davisii (p. 577). 



Foreign—" Primordial " zone of Bohemia, with trilobites of the 



genera Paradoxides, &c. (p. 573). 

 Alum schists of Sweden and Norway (p. 581). 

 Potsdam sandstone, with Dikelocephalus and Obolella (p. 5S1). 

 Quebec group with mixed fauna, resembling that of Lower 



Llandeilo and Tremadoc groups (p. 583). 



British — Harlech grits, with Arenicolites sparsus, &c. (p. 578). 

 Llanberis slates, with zoophytes {Oldhamia) (p. 578). 



Foreign^- Huron ian series of Canada (p. 583). 



f British — Fundamental gneiss of the Hebrides ? (p. 585). 

 Hypersthene rocks of Skye ? (p. 579). 



1 Foreign — Labradorite series north of the river St. Lawrence in 



Canada (p. 583). 

 [ Adirondack Mountains of New York (p. 584). 



{British — Wanting ? 

 Foreign — Beds of gneiss and quartzite, with interstratified lime- 

 stones, in one of which, 1000 feet thick, occurs a foraminifer, 

 Eozoon Canadense, the oldest known fossil (p. 584). 



