12 



FOSSIL PLANTS. 



In Lancashire. 









In Yorkshire. 











Yds. 



Ft. 



In. 





Yds. 



Ft. 



In. 



Strata 



. 20 











Strata 



56 











Seam (40 yards) 







1 



6 



Seam (40 yards) 







1 







Strata 



. 64 











Strata 



39 











*** Upper Foot Seam (Dog Hill) 







1 



2 











Strata 



. 15 



















** Gannister Seam 



I 











** Halifax Hard Seam 







2 



3 



Strata 



. 13 











Strata 



14 











Lower Foot Seam (Quarlton) ... 







2 







Middle Seam 











11 



Strata 



. 17 











Strata 



24 











Bassy Seam (New Mills) 







2 



6 



Soft Seam 







1 



6 



Strata 



. 40 











Strata 



56 











Seam 



. 







10 











Strata 



. 10 



















Sand or Featheredge Seam 







2 







Sand Seam 











4 



" Rough Rock " of Lancashire, " Upper 















Millstone" of the Geological Survey 



20 











" Upper Millstone" of Phillips, Halifax . 



36 











Strata (Rochdale or Lower Flags) 



. 120 











Strata (Lower Flagstone) 



72 











*Seam ... 











6 



Little Seam 











3 



Strata 



. 2 



















Seam 











10 











Strata 



. 14 



















Seam 







1 



3 











" Upper Millstone" of Lancashire. 

















In the Lancashire Coal-field all the seams of coal from the " Forty Yards" downwards 

 have at places afforded Avicidopeden and other marine shells in the roofs of black shale ; 

 and these latter strata generally contain calcareous nodules. The nodules in the seams 

 of coal commonly known by the name of " Bullions" have chiefly been found in the beds 

 marked *, **, and *** in Lancashire ; whilst in Yorkshire they have as yet been only 

 observed in the " Halifax Hard Seam," marked **. 



§ 2. Remarks 071 Specimens Nos. 1, 2, a?id 4i toW. 



The specimens showing structure intended to be described in this Memoir are (with 

 the exception of No. 3) from the thin seam of coal marked * in the vertical section of the 

 Lower Coal-measures of Lancashire previously given ; and are from the same " mine" or 

 bed from which the specimens described by Dr. Hooker and myself were obtained. They 

 were found associated with Halonin, Sif/illaria, Lepidodendron, Stigmaria, Trigonocarpon, 

 Lycopodites, Lepidostrobus, MeduUosa, and other genera of plants not yet determined. 

 The foregoing are mentioned in the order of their relative abundance. 



