WHITE.] PUTTS VILLE FLORAS IN OTHER REGIONS. 815 



QUINNIMONT FORMATION. 



The upper portion of the Clark formation, which is about 375 feet 

 thick in the Pocahontas quadrangle, is marked by the enrichment of 

 both the Sphenopterid and Neuropterid groups in the flora. The 

 variety imequalis of JVeuropter^'s Pocahontas survives, and in passing 

 upward into the base of the Quinnimont formation, or toward the 

 middle of the Welch formation, the partial contemporary of the Quin- 

 nimont, we And it associated with the identical forms of Aneimites j^otts- 

 villensis, JIa/'iojjfe/'is potts villea^ Sjjhenopterisjxctentissima^jVetiropteris 

 Smithsii, 8phenopliyllim%tenue^ Lepidodendronalabametise, and Trigono- 

 carpum Helenw^ so common in and characteristic of the horizon of the 

 roof of Ljivens coal No. i in the Southern Anthracite field. In fact, the 

 flora becomes practically identical with that in the anthracite region. 

 To this zone, for which I have already suggested the term Jfariopteris 

 pottsvillea^ on account of the common occurrence and very easy recog- 

 nition of the latter therein, belong the fossils from the Dade coal in 

 the Ringgold, Stevenson, and Chattanooga quadrangles^ and the 

 lower coal mined at Dayton in the Pikeville quadrangle," all in the 

 Tennessee- Alabama region. In fact, to the Mariopteris pottsinllea 

 zone, giving the latter a broad interpretation so as to include a series of 

 closely connected modifications of the tj'pes, belongs the entire suc- 

 ceeding Quinnimont formation, 300 feet thick in the type region repre- 

 sented in the Pocahontas quadrangle, and present in the Raleigh and 

 Kanawha Falls ^ quadrangles; the upper portion of the Welch formation 

 in the Tazewell quadrangle; a part of the Lookout sandstone, including 

 the vicinity of the Dade coal, in the Chattanooga, Stevenson, Ringgold, 

 Pikeville, and Kingston* quadrangles in the southern Appalachian 

 region; and probabl}' a portion at least of the Lee formation in the 

 Estillville, Briceville, Wartburg, and, perhaps, also in the London 

 quadrangles'' m the northern Tennessee-Kentucky region. The flora 

 of the Hindustan whetstone beds of Orange County, Lidiana, is also 

 referable to this zone, and indicates the contemporaneity of those 

 beds with at least some portion of the Quinnimont formation. 



The extent of the zones and the more definite relations and equiva- 

 lents of the formations in the several quadrangles will be discussed in 

 the later, monographic, treatment of the floras. 



1 Geologic Atlas of the United States, folios 2, 19, and 0, respectively. 



2 Op. eit , folio 21. 



3 Op. cit. These folios have not yet been published or numbered. 



4 Op. cit., folio 4. 



6 Op. cit., folios 12, 33, 40, and 47. 



