452 CARBOXIFEROUS ROCKS IX CUMB. CO. — LOGAN & FLETCHER, 



Ft. In. 



Gray argillo-arenaceous shale, with stigmarioe {under- 

 Gray sandstone 3 



Gray crumbly argillo-arenaceous shale, or sandstone, 



with stigmarice (underclay) 6 



(From the top of the succeeding bed springs an upright 

 sigillaria. Its roots spread out into the shale. It is 

 coated with coal, and the material of the interior cast 

 is not of uniform quality, being partly sandstone and 

 partly shale. The shale occupies a transverse portion 

 about 6 inches thick, and is rather less than half way 

 up the stem, of which about 6 feet are visible, run- 

 ning into the underclay above. From the root of the 

 plant, as if it had wound round or been pushed aside 

 by the root, proceeds a stigmarla branch. It runs 

 horizontally a short distance, and the turns up ver- 

 tically. The leaves proceeding from the vertical por- 

 tion, are not at right angles to the branch, but in part 

 at least assume a vertical direction, and run parallel 

 with.it; those emanating from the groved side (in 

 ordinary cases the under part or belly of the branch) 

 taking a downward, and those from the back an up- 

 ward course. The leaves issuing from the sides may 

 be at right angles to the branch, and run horizontally 

 into the bed, but being thus concealed they could not 

 be traced. At first sight the stigmarise branch had 

 much the appearance of being a continuation of the 

 root of the sigillaria, but close inspection shewed 

 that the two, although touching, were distinct. The 

 former rested on the latter nearly one-eighth of a 

 circle, but being then suddenly cut off, it may when 

 entire have wound much farther round, and the car- 

 bonaceous envelopes of the two plants were clearly 

 discernible. See fig, 5 [of the original cuts,] ) 

 Gray argillaceous shale 10 



