176 ON THE ORIGIN OF COAL. 



probably have reached up to the Roger seam 

 of Coal. 



Fig. 1.* 



yds. ft. in. 



r a Coal 

 b Dirt . 



ROGER . 



MINE, i «<^°^> • " " » 



d Dirt 6 



L e Coal 1 



/ Warren containing the fossil trees 17 



g White gritstone 16 



A Coal and dirt 1 



i Floor full of Stigmaria Jfcojrfes. 



In the Duchess of Lancaster mine at Pendleton, 

 near Manchester, have been observed a great 

 number of fossil trees, most of which exhibited 

 undoubted characters of Sigillaria. They stood 



* The seams of Coal and fossil trees in all the three wood- 

 cuts, are drawn upon a scale of double the size of the other 

 strata, and are merely for the purpose of showing the position, 

 and not the characters of the fossils. 



