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 Owrara) 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 a 

 paper entitled " On some Fossil Plants, showing Structure, from 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 Lancashi 



re. 







In Yorkshire. 









Yds. 



Ft. 



In. 





Yds. 



Ft. 



In. 



Arley or Royley Seam ... 



1 



1 







Beeston or Silkstone Seam 



... 2 











Strata 



69 











Strata 



... 77 











Seam 











3 



Royds or Black Seam .. 



... 



2 



10 



Strata ... 



57 











Strata 



... 38 











Seam 











6 



Better Bed Seam 







1 



4 



Strata ... 



4.T 











Strata 



... 5i 











Upper Flagstone (UphoIIand) . 



:>o 











Upper Flagstone (Elland) 



... 40 











Strata 



20 











Strata 



... 40 











Seam (90 yards) 











5 



Seam (90 yards) 











6 



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



2 'Quarterly Journal of the Geological Society of London' for May, 1862, vol. xviii, p. 106. 



