II. Remarks on the Specimens. 



§ 1. Geological Position of the Specimens, Nos. 1 to 11. 



The Specimens described in this Memoir are sixteen in number; and all those 

 exhibiting structure (with the exception of No. 3, which came from South Owram) were 

 found by me in the lower division of the Lancashire Coal-measures, imbedded in calca- 

 reous nodules occurring in seams of coal. 



Specimens No. 1, 2, and 4 to 11 are from the same locality as the Trigonocarpon 

 described by Dr. J. D. Hooker, F.R.S., and myself in a memoir " On the Structure of 

 certain Limestone-nodules enclosed in seams of Bituminous Coal, with a description of 

 some Trigonocarpons contained therein" and the other specimen, No. 3, is from the same 

 seam of coal in the Lower Coal-measures as that in which the specimens described in xi 

 paper entitled " On some Fossil Plants, showing Structure, froui the Lower Coal-measures 

 of Lancashire"^ were met with, but from a different locality, namely, from the " Halifax 

 Hard Seam" at South Owram, marked ** in the section given below. Specimens of 

 Calamodendron are also sparingly met with in the " Bullion Mines" near Burnley, 

 marked **, — and in the "Upper Foot Mine," near Oldham, marked ***, in the following 

 vertical sections of Coal-measures. 



The position of the seams of coal in which the fossil woods were found in the Car- 

 boniferous series is shown by the following sections of the Lower Coal-measures. 



In Lancashire. In Yorkshire. 



Arley or Royley Seam ... 



Strata ... 



Seam 



Strata ... 



Seam 



Strata ... 



Upper Flagstone (Upholland) ... 



Strata 



Seam (90 yards) 



Yds. Ft. In. 



1 1 0 



(i9 0 0 



0 0 3 



57 0 0 



0 0 6 



4.5 0 0 



.50 0 0 



20 0 0 



0 0 5 



Beeston or Silkstone Seam 

 Strata 



Royds or Black Seam ... 

 Strata 



Better Bed Seam 



Strata 



Upper FlagstoDe (Elland) 

 Strata 



Seam (90 yards) 



Yds. Ft. In. 



2 0 0 



77 0 0 



0 2 10 



38 0 0 



0 1 -4 



51 0 0 



40 0 0 



40 0 0 



0 0 (i 



^ ' Philosophical Transactions,' 1855, p. 149. 



2 'Quarterly Journal of the Geological Society of London' for May, 1862, vol. xviii, p. lOG. 



