170 CARBONICOLA, ANTHRACOMYA, AND NAIADITES. 
GENERAL SECTION OF THE DERBYSHIRE COAL-FIELD. 
From Mr. A. H. Sroxzs’ Section. 
Hozels Coal 
Measure and Balls Rake, 
Staveley 
Top Hard Coal 
Dunsil Coal 
Waterloo Coal 
Cannel Coal 
Tunnel Coal 
Buff or Cement Rake 
Pinder Park Rake 
Brown Rake. 
> | Butter! 
Black Sees, caaaret! 
Ell Coal 
Deep Soft Coal 
Poor Rake, Alfreton 
Blue Rake, Butterley 
Deep Hard Coal 
Piper Coal 
Whetstone Rake and Wallis 
Rake, Butterley 
Dogtooth Rake 

With Carbonicola subconstricta ? * 
These beds contain at several hori- 
zons one or other of Carbonicola 
acuta, C. aquilina, C. ovalis, 
C. nucularis, Naiadites modio- 
laris, and N. carinata. 

With Carbonicola robusta and 
Naiadites modiolaris. At Codnor 
Ironstone, Staveley Park. 
Tupton Coal 
Nodule Rake, Morley 
Black Shale Rake 
Silkstone, Black Shale, or Clod 
Coal 

Green Close Rake 
Holly Close Rake 
Black or Ketlands Rake 
Bacon Flitch Rake 
Yew Tree Rake 
Kilburn Coal 
Honeycroft Rake 
Cavilly Rake 
Naughton Coal 
Dale Moor Rake 
Gannister 
ae * In the Memoirs of the Geol. Survey of Great Britain,’ “ The Iron Ores of Great Britain,” part i, p. 40, is stated, 
“This shell, Unio or Anthracosia, probably of several species, is found more or less abundantly in all the Ironstone beds, 
from the top of the section down to the Black Shale Rake. In the lower measures it is much more scarce, or is even 
altogether wanting in some of the very lowest. The Anthracosia bipennis which occurs in the Measure and Balls Rake is 
found also in the Low Moor Ironstone, and at Mold in Flintshire.” 
