274 



Canadian Record of Science. 



Canadiau Geolo- 

 gical Survey. 



Ells & Fletcher 

 in KoTa Scotia. 



David White. 



r Union, includ- 

 Catskill. ing rocks of » 



- jMacAra Brook, 



Chemung. Lochaber and 



(^Economy. 



TRiversdale, Har- 

 rington River 



Hamilton. - (4000 ft. ) Mac- 



Kay Head and 



l^Horton. 



Corniterous. -^ , , / 



(^ Conglomerate. / 



The Horton Plant Beds. 



The Horton Bluff terrane, as recognized by Sir William 

 Dawson (1843) and Sir Charles Lyell (1847), is referred 

 by Dr. Ells and Mr. Fletcher to the Hamilton, it being 

 apparently included in the Riversdale series. The Horton 

 plant beds are characterized by a very peculiar flora 

 containing an abundance of both Aneimites Acadicus and 

 Lepidodendron corrugatum with its numerous decorticated 

 phases, together with one or more higher types of Le'pi- 

 dodendron and a singular form of S'jphenopteris. Aneimites 

 appears to be an exclusively Carboniferous genus. The 

 Lepidodendra are larger and more advanced, with larger 

 bolsters than any known Devonian type. Biologically 

 the flora is distinctly younger than any yet found in 

 undisputed Devonian rocks, and it appears to be even 

 more modern than the Ursa ^ flora. 



Essentially the same flora is everywhere characteristic 

 of the Pennsylvania and Virginia Pocono, with which the 

 Horton flora was correctly correlated by Sir William 

 Dawson as long ago as 1873. Not only is the Pocono 

 similarly marked by an abundance of Lepidodcndron cor- 

 rugatum, but by the hardly less abundant Aneimites, some 



1 The Ursa .stage, tyjiical in Bear Island and Spitzbergen, is generally included 

 within tlie lower limit of the Carboniferous, thoiigh \<y some geologists it is regarded 

 as transitional from Devonian to Carboniferous. 



