182 
C. LAPWORTH ON GRAPTOLITES 7 
TABLE A. 
Showing the various Horizons, approximate Geological Age, and American and European Equivalents of the 

Geological Survey of Canada to Professor 


EUROPEAN FORMATIONS AND GRAPTOLITIC ZONES. 

Formations in Great Britain. 

Graptolitie Zones already recognised in the foregoing formations in 
reat Britain and Europe. 

CAMBRIAN (UPPER) 
SYSTEM. 
CAMBRO-SILURIAN 
ORDOVICIAN OR 
OR 
PRIMORDIAL SYSTEM. 
Bawa or Carapoc FORMATION. 
E*.—Upper Division. 
E*.—Middle Division. 
E1.—Lower Division (Bala Lime- 
stones of Wales). 


LLANDEILO FORMATION. 
D*.—Upper Llandeilo. 
D*.—Middle Llandeilo (Llandeilo 
Limestones of 8. Wales, 
Craighead Limestone of 
Scotland.) 
D'—Lower Llandeilo. 
E%.—Zone of DicEzLoGRApTus anceps, Lapworth, (Hartfell, Scot- 
land, Sweden, Bohemia, ete.) with Dipl. truncatus. 
(UPPER HARTFELL.) 
E°,—7Zone of PLEUROGRAPTUS LINEARIS (Scotland, Seandinavia), with 
Amphigraptus radiatus, H., Lept. flaccidus, H., Orth. quadri- 
mucronatus, H. 
(MIDDLE HARTFELL.) 
E1.—Zone of DicranoGraptus CLINGANI, Carr. (Scotland, Sweden), 
with D. ramosus, Climac. caudatus, C. bicornis, Dicell. For- 
chammeri, ete. 
(LOWER HARTFELL.) 


D*.| Zone of Cœxograprus Graciuis, Hall. With Dicranograptus 
ramosus, var. spinosus, Dicran. Nicholsoni, Didym. sagit- 
tarius, Hall, Lasiograptus mucronatus, Hall, Didym. super- 
[ stes, Climac. antiquus, C. Scharenbergi, Dicellograptus 
D°.] sextans, Dipl. Whitfieldi, Leptograptus sp., etc. 
(GLENKILN SHALES, etc.) 
D1.—Zone of Dinymocraprus Murcuisont, Beck, with Glossograptus 
ciliatus, Emmons, Climac. perexcavatus, Lapw. 
(LLANDEILO SHALES, etc.) 

ARENIG FORMATION. 
C*%—Upper Arenig. 
*—Middle Arenig (Orthoceras 
Limestones of Sweden). 
C!.—Lower Arenig. 
C5,—Zones of Ashes and Lavas of Arenig, Shelve, and Borrow- 
dale, Cumberland. (BORROWDALE SERIES.) 
C*.—Zone of Dipymograprus Biripus, Hall. With Didym. exten- 
sus, D. Nicholsoni, Phyll. angustifolius, ete. 
2 (UPPER SKIDDAW.) 
Cl.—Zone of TETRAGRAPTUS BRYONOIDES, Hall, with Zoganograptus 
Logani, Didym. patulus, D. nitidus, Tetra. Bigsbyi, T. 
fruticosus, ete. 
(LOWER SKIDDAW.) 





B. Tremavoc FORMATION. 
?—Upper Tremadoc. 2—Zone of Bryocrarrus K3EruLrI, Lapworth, with Clonograptus, 
Dictyonema, ete. 
(UPPER TREMADOC SLATES.) 
— Lower Tremadoc. Bl.—Zone of DicryoNEMA SOCIALE, Salter, (= D. flabelliforme, 
Eichwald) and Clonograptus. 
(LOWER TREMADOC SLATES.) 
A. Lrecura FLaGs. (UPPER.) Zones of OLENUS SPINULOSUS and O. SCARABEOIDES. 

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