i88 9 . | 



BOTANICAL GAZETTE. 



3M 



Crab Orchard Shales.— Mud shales, containing a few 



thin layers of limestone. 



Acer rubrum L. 



Negundo aceroides Moench. 

 Gleditschia triacanthos L. 

 Liquidambar Styraciflua L. 

 Ulmus Americana L. 

 Platanus occidentalis L. 

 Juglans nigra L. 



Carya alba Nutt. 



Quercus alba L. 



Q. obtusiloba Michx. 



Q. macrocarpa Michx. 



Q. Prinus L. var. acuminata Michx. 



Q. rubra L. 



Corxiferous. — Layers of limestone, often containing 

 masses of silica, forming a red soil. 



Hypericum perforatum L. 

 Acer saccharin um Wang. 

 Cassia Marilandica L. 



Will 



C Chamsecrista L. 

 Potentilla paradoxa Nutt. 



Lobelia leptostachys A. DC. 

 L. spicata, Lam. 

 Acalypha Virginica L. 



Black Slate. — Thin layers of slate which are somewhat 

 bituminous. When well-drained this slate decomposes into 

 a soil which is fair, especially where there is a leaf-mold. In 

 places where the layers of slate are horizontal the drainage 

 is poor, giving rise to a very wet soil. 



(Level and badly drained portion.) 



Polygala Curtissii Gray. 

 Khexia Virginica L. 

 Quercus alba L. 

 Q. obtusiloba Michx. 



Q. imbricaria Michx. 



Q. rubra L. 



Commelyna Cayennensis Richard. 



(Well-dn 



Liriodendron 1 

 Rhus glabra L. 

 Deamodium Di 



Lespedeza rep< 



Liquidambar Styraciflua L. 

 Vernonia Noveboracensis Willd 

 Gerardia integrifolia Gray. 



Lower Subcarboniferous. — This formation has at its 

 base (1) a considerable thickness of ash colored shales ; (2) 

 above these harder shales with some limestones; (3) just 

 above the upper subcarboniferous, hard shales and sand- 

 stones. 



(Lower Division.) 



Ascyrum Crux- Andrew L. 

 «tylosanthes elatior Swartz. 

 *Aipatorium purpureum L. 



v-ter longifolius Lam 

 Polymnia T'vedalia L. 



