SURFACE GEOLOGY. 



G 5 . 37 



Lucanthemum vulgare, Lam. 

 Tanacetum vulgare, L. 

 Artemisia Absinthium, L. 

 Gnaphalium decurrens, Ives. 

 Antennaria margaritacea, A. Brown. 



" plantaginifolia, Hook. 



Erechthites hieracifolia, Raf. 

 Cirsium lanceolatum, Scop. 



" altissimum, Spreng. 



" pumilum, Spreng. 



" arvense, Scop., 



11 " var. album. 



Lappa officinalis, Ailioni. 

 Hieracium scabrum, Michx. 

 11 venosum, L. 



11 paniculatum. L. 



Nabalus albus, Hook. 



" altissimus, Hook. 



11 Fraseri, D'C. 

 Taraxacum Dens-leonis, Desf. 

 Lactuca, Canadensis, L. 



11 integrifolia, Torr. & Gray. 



" sanguinea, Torr. & Gray. 

 Mulgedium leucophaeum, D'C. 

 Sonchus asper, Vill. 

 Lobelia cardinalis, L. 



" syphilitica, L. 



11 inflata, L. 



Pawiewm capillare, L. 

 11 virgatum, L. 



" Crus-galli, L. 



Setaria glanca, Beauv. 

 " viridis, Beauv. 

 Sorghum nutans, Gray. 

 Equisetum arvense, L. 

 " hyemale, L. 



Polypodium vulgare, L. 

 Adianturn pedatwm, L. 

 Pteris aquilina, L. 

 Woodwardia Virginica, Smith. 

 Asplenium Trichomanes, L. 



11 angustifolium, Michx. 



Camptosorus rhizophyllus, Link. 

 Aspidium Noveboracensis, Swartz. 

 " spinulosum, Swartz. 



" marginale, Swartz. 



11 acrostichoides, Swartz. 



Onoclea sensibilis, L. 

 Osmunda regalis, L. 

 Lycopodium dendroideum, Michx. 



" clavatum, L. 



Selaginella rupestris, Spreng. 



Chapter IV. 



The Geology of the Region. 



1. The rock formations all belong to the series of forma- 

 tions which underlie the true or Productive Coal Measures. 



There are no true Coal Measures in the two counties. 



The Third Anthracite Coal Field comes nearly up to, but 

 does not quite reach the county line— so far as its lowest 

 workable beds are concerned, — but the basin itself runs on 

 northward. Its bounding mountain walls of Pottsville Con- 

 glomerate unite and form the high northern end or prow of 

 the Canoe. 



The Pottsville Conglomerate, however, has coal beds lying 

 between its massive sandrock strata ; and these, the only 

 deposits of coal in the two counties which deserve notice, 

 will be described in Chapter V. 



