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position with the fourth group in the slate system of Wales, described 
by Professor Phillips.* 
Organic Remai^sTs of the Fifth Group. 
Plants. Europem localities. 
Various species of fucoides differing from 
those of the red sandstone. 
Testacea. 
Conularia quadrisulcata, S Gloucestershire. 
Cyrtolites ornatus, C. 
Pterinea carinata, G Coblenz. 
planulata, C. 
pholadis, C. 
modiolaris, C. 
Leptaena planulata, C. 
Delthyris striatula, G. (lower strata) . . . Eifel. 
6. Black limestone and shale of Trenton falls, embracing the birds- 
eye limestone" and " calciferous sandrock" of Professor Eaton, and the 
grauwacke and slate of the Hudson river. The group clearly represents the 
" black shale enclosing beds of gTauwacke, flagstone and calcareous slate, 
which, prolonged to the southwest, join themselves to the trilobite beds 
of black limestone and calcareous flagstone at Llandeilo."t In Mr. 
Murchison's table this group is termed " Llandeilo flags." 
Organic Remains of the Sixth Group. 
Plants, European localities, 
Fucoides serra, Brong Wales. 
dentalus, B. 
demissus, C. 
fibrosus, C. 
scalaris, C. 
fimbriatus, C. 
lineatus, C. 
ramulosus, C. 
Polyparia. 
Trianisites ClifFordii, Raf. 
Columnaria sulcata, G Europe. 
Cyathophyllum ceratites, G Eifel. 
Gorgonia 
. ■ -.A- 
* Encyc. Metrop. article Geology, p. 568. 
t Ibid. 
