92 



1903. 



NOTES ON SOME FOSSIL PLANTS 

 FROM THE ARIGNA MINES. 



C01.1.KCTKD BY Mr. Joseph Ryans. 



BY R. KIDSTON, F.R.S. 



At the request of Prof. Cole, of the Royal College of Science, 

 Dublin, Mr. Joseph Ryans, manager of the Arigna Mines, 

 Co. Roscommon, sent me a collection of fossil plants from 

 several parts of the Arigna coal-field. 



The table of strata of the Arigna coal-field, given in the 

 Memoir of the Geological Survey^ which describes this area, 

 is as follows : — 



Tabi,E of Strata. 



Lower Coal j Fine-grained white grits, 

 Measures. \ Shales, with marine fossils, . 



'Dark grey grits, with plant remains, 



Shales, ..... 



Impure black-band ironstone, 



Middle Coal (Main Coal), 



Coal Seat, full of rootlets of Stigmaria, 



Dark grey thin grits, . 

 \ Black shales, .... 



Thick even-bedded grits. 



Bottom or Crow Coal, 



Coal Seat, with rootlets of Stigmaria, 



Thin flaggy grits. 



Splintery shales, 

 L Thick massive grits, . 

 Yoredale shales, .... 



Upper Limestone, ..... 



Millstone 

 Grit. 



The seam named the Middle Coal in the above section is 

 called the Main Coal by Mr. Ryans, and most of the fossils 

 sent me were collected from strata associated with this seam. 



^ No. 66, 67, Memoirs of the Geological Survey. Explanatory Memoir 

 to accompany Sheets 66 and 67 of the Maps of the Geological Survey of 

 Ireland, illustrating part of the Counties of Sligo, Leitrim, Roscommon, 

 and Mayo. By Richard J. Cruise, m.r.i.a. ; with Palaeontological Notes 

 by W. H. Baii,y, f.i,.s., &c. Dublin, 1878. (p. 28). 



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