IN NOVA SCOTIA FLETCHER. 241 



be drawn faunally it should be between the Chemung and the 



Waverley The difficulties are not less serious in 



England, and the Pilton and Baggy beds hold faunas which it is 

 as difficult to settle" on the Devonian or Carboniferous side as it 

 has been with the Waverley, Kinderhook or Marshall." Pro- 

 fessor J. S. Newberry then proposes a classification in which he, 

 includes in the Carboniferous system all strata from the Permian 

 to the Chernung, both inclusive ; whereas Professor Hall adopts 

 the first alternative suggested above and restricts the term 

 Catskill group to the beds known as X and XI of the Pennsyl- 

 vania survey (Pocono and Mauch Chunk) ; and others speak of 

 the latter as distinct from and overlying the Catskill. Adopting 

 Professor Hall's grouping it would seem that the Mauch Chunk 

 and Pocono may represent respectively the Union and Rivers- 

 dale series of the Nova Scotian Devonian ; and that, unless the 

 littoral and estuarine sediments of Pennsylvania represent the 

 pelagic rocks of the east, there must be a great unconformity 

 by which the gypsiferous formation, traced, as above stated, 



from Newfoundland to the Aroostook, is lost. It h 

 that in working up from the lower Palaeozoic, 

 to carry the Catskill to XI of the Pennsylvania 

 in working downward from the upper Palseozo 

 seem to carry the Permian to VIII (Venango). 



The International Congress proposes to place t 



s been found 



fossils seem 



classification, 



the fossils 



e upper limit 



of the Devonian at the base of the Carboniferous Limestone 

 and to include in the former the Catskill and the so-called 

 Lower Carboniferous or Tweedian group of Scotland. The 

 Tweedian has been also correlated with the Condroz beds of 

 Belgium, from which one of the subdivisions of the Devonian 

 (Condrusian) in the classification of the Congress takes its 

 name. 



The annexed tabular view of various classifications proposed 

 for these rocks will show at once their radical inconsistency and 

 the indefinite range of the fossils : 



PKOC. & TKANS. N. S. INST. Sci., VOL. X. TRANS.-P. 



