Area from 150 cm above the base, representing that portion of 

 the tree in which the development of the Lepidodendron form 

 of leaf cushion begins to dominate. The sigillarioid ribs along 

 the center are narrowed and exaggerated by lateral pressure. 

 A relatively broad rhomboidal type of cushion is seen on the 

 sides. 



Cortical impression at 210 cm above the base, at and extending 

 to the left of the center ; the median portion of the cortex is 

 very narrowly compressed, the lateral, on the left, showing 

 the lepidodendroid fusiform cushion, in which, as on the right 

 in figure 1, the impression of the leaf bundle sheath is shown 

 through the partially macerated surrounding cushion tissue. 



Small area near the border of the impression, at about 180 cm 

 above the base, illustrating a short form of lepidodendroid leaf 

 cushion. 



Small area, at about 130 cm above the base, in which the leaf 

 scars occupy nearly the entire width of the longitudinal ribs. 



