To face p. 455.] 
TABLE SHOWING THE CLASSIFICATION AND CORRELATION OF THE GRAPTOLITE-BEARING ROCKS OF EUROPE AND AMERICA. 
Aon. & Mag. N. H. ser. 5, vol. iii. 
Wales. J West of England. 
Lake District. 
South Scotland. 
Ireland. 
Norway. 
Sweden. 
Bohemia. 
France. 
North America. 
Silurian System. 
Upper Division 
(Downtonian). 
(c) Dowuton Sandstone, (6) Bone Beds, 
(a) Lower Ludlow. 
Kendal Rocks. 
Lesmahagow 
and 
Pentland Rocks. 
Riccarton Beds. 
Dingle Beds. 
Sandstone. 
Gothland Sandstone. 
II. 
G. 
F. 
Lower Helderberg Series. 
Middle Division 
(Salopian). 
( d) Aymestry Limestone, (c) Lower Ludlow, 
(6) Wenlock Rocks, (a) Woolhope Beds. 
(c) Bannisdale Beds, 
(b) Couiston Grits, 
(a) Coniston Flags. 
(6) Croaghmarhin Beds, 
(n) Ferriters' Cove Beds. 
8. 
G. 
Gothland Marl 
and 
Limestone. 
Ee”. 
Guelph 
Niagara Series. 
Lower Division 
(Valentian). 
( c ) Tarannon Shales, 
(6) Mayhill Sandstone, 
(a) Lower Llandovery. 
(c) Purple Shale and 
(6) Pentamerus-Beds of 
Shropshire. 
Coniston Mudstones. 
(6 ) Hawick and Gala 
Rocks, 
(a) Birkhill Shales. 
Upper Girvan 
or 
Penkill Group. 
Upper Pomeroy 
and 
Coalpit-Bay Beds. 
5 b. 
5 a. 
( d) Leptasna-Limestone, 
(c) Retiolites-Beds, 
(6) Lobiferus-Schist, 
(a) Brachiopod-Schist. 
Ee* 
and 
Colonies. 
(6) Ampelite-Lime8tone, 
(«) Ampelite-Schists. 
(c) Clinton, 
(6) Medina, 
(a) Oneida. 
a 
- 
•/I 
z 
a 
5 
Upper Division 
(Caradoc). 
Hirnant and Bala Series 
of 
North Wales. 
Caradoc Sandstone 
of 
Shropshire. 
(b) Coniston Limestone, 
(a) Dufton Shales. 
(6) Ilartfell Shales, 
(a) Glenkiln Shales. 
(6) Lower Girvan, 
(a) Craighead Limestone. 
(c) Lower Pomeroy, 
t6) Carnalea, and 
(a) Bally grot Beds. 
, 
Trinucleus-Shales. 
Middle Graptolite Schists 
and 
C'hasmops-Limestone. 
D\ 
I) 4 
to 
D*. 
Schiste ardoise. 
(d) Lorraine Shales, 
(c) Utica Slate, 
(6) Trenton Limestone, 
(a) Chazy. 
Middle Division 
(Llandeilo). 
Llandeilo Series 
of 
Builth and Abereiddy. 
Llandeilo Flags 
of 
Meadowtown. 
Borrowdale Volcanic 
Rocks. 
36. 
Lower Division 
(Arenig). 
( b) Arenig Series of 
St. Davids, 
(a) Upper Tremndoc. 
(6) Arenig Rocks of 
Shelve, 
(a) Stiper Stones. 
(6) Upper Skiddaw, 
(c ) Lower Skiddaw 
Slates. 
3 a. 
2 6. 
(c) Orthoceras-Limestone, 
(6) Phyllograptus-Schist, 
(a) Ceratopyge-Limestone. 
Quebec 
and 
Calciferous Groups. 
Cambrian 
System. 
Upper Division 
(Olenidian). 
(d) Lower Tremadoc, 
(c) Dolgelly Group, 
lb) Festiniog Group, 
(a) Maentwrog Group. 
(6) Shineton Shales, 
(a) Olenus-Shales of 
Malverns. 
(6) Dictyonema-Schists, 
(a) Olenus-Schists. 
Potsdam Group. 
