PAPERS 0"X GEOLOGY AXD GEOGRAPHY 397 



Lepidodendron. Sigillaria, ITlodendron, Stigmaria, Sphe- 

 nophyllum. especially S. marginatum, Pecopteris, es- 

 pecially P. unita and P. villosa, Alethopteris, especially 

 A. louchitica, Callipteris, especially C. Snllivauti, Xen- 

 orpteris, especially hirsnta, and various types of Sphe- 

 nopteris, Odontopteris. and Palmatopteris. Also various 

 seeds of Cycodotilicales, like Trigonoearpus, and leaves 

 of Cordaites are frequent. 



The flora of Braidwood resembles closely the famous 

 deposits of the Mazon Creek and Coal City, which are 

 situated in the neighborhood. It is different from that of 

 Colchester and Murphysboro, 111., which also belong to 

 horizons similar to those of Braidwood. 



If we compare the Braidwood flora with the standard 

 deposits of Pennsylvania and of Europe, we come to the 

 conclusion that it corresponds to the lower Alleghany 

 formation of Pennsylvania (Kitanniug), and to the 

 upper TVestphalien and lower Stephanian of western 

 Europe. The horizon of ]S[azon Creek was usually con- 

 sidered as lying at the basis of the Carbondale section of 

 the Pennsylvania formation of Illinois immediately above 

 coal Xo. 2. 



Since lately the correlation of Illinoisian coal seams 

 has become questioned, it may be wise to postpone a defi- 

 nite stratigraphic assigTimeut of the Braidwood flora un- 

 til the time when the horizons of the coal measures of Illi- 

 nois are again definitelv fixed. 



