THE CARBONIFEROUS ROCKS OF CANONBIE, DUMFRIESSHIRE, ETC. 7&3 



The following Table shows the vertical distribution in Britain of the Lower Coal 

 Measure plants from Eowanburn, Canonbie. 





U. C. M. 



M. C. M. 



L. C. M. 



Sphenopteris obtusiloba, Brongt., . . ... 





X 



X 



(?) ,, Schiitzei, Star, sp., 













1 



X 



Eremnpteris artemisisefolia, Sternb., sp., . 













X 



X 



Mariopieris muricata, Sehl., sp., . 











X 



X 



X 



Alelhopteris lonchitica, Schl., sp., . 











x 



X 



X 



Neuropteris heterophy/la, Brongt., 













X 



X 



„ gigantea, Sternb., 













X 



X 



,, Blissii, Lesqx., 















X 



„ obliqua, Brongt., sp., . 













X 



X 



Catamites (Calamitina) undulatus, Sternb., 











X 



X 



X 



,, (Stylocalamites), Cistii, Brongt., 











X 



X 



X 



Catamites, sp., .... 











X 



X 



X 



Sphenophyllum euneifulium, Sternb., sp., . 













X 



X 



Lepidodendron aculeatum, Sternb., 









x 



X 



X 



,, obovatttm, Sternb, 











X 



X 



Lejndostrobus, sp., 











X 



X 



X 



Stigmaria firoides, Sternb., sp., 











X 



X 



X 



Cordaianthus Pitcairnim, L. and 11., sp., . 













X 



X 



Of the sixteen species under consideration, all occur in the Lower Coal Measures of 

 Britain, fourteen occur in the Middle Coal Measures of Britain, excluding one of whose 

 occurrence in that horizon there is some doubt, and six are common to all divisions of 

 the Coal Measures. In all cases the majority of the Lower Coal Measure species are 

 found in the Middle Coal Measures, but the Middle Coal Measures are distinguished 

 from the Lower Coal Measures by the presence of species peculiar to that division, and 

 these are entirely absent from the Eowanburn Coals, which contain a most typical Lower 

 Coal Measure flora. 



From the Upper Coal Measures the Eowanburn Coals are easily distinguished by 

 the entire absence of all characteristic Upper Coal Measure species. 



The fossil plants from Eowanburn leave, therefore, no doubt as to the series belonging 

 to the Lower Coal Measures. 



Fossil Plants of the Middle Coal Measures. 



In the Middle Coal Measures several localities were found by Mr A. Macconochie 

 which yielded fossil plants, and one bed which passes across the mouth of the Byre 

 Burn a few yards above Byreburn Bridge, and which is again found on the Eiver Esk 

 about 30 yards below the junction of the Byre Burn with that river, was particularly 

 rich in species. 



The following are the localities in the Middle Coal Measures, Canonbie, from 

 which fossil plants were collected, arranged in ascending series, — locality A being the 

 lowest bed, and locality F being the highest, in which fossil plants were observed. 



