PALEOZOIC ROCKS AND ERA. 



305 



branches (Fig. 224), as scattered leaves, like those in the 

 restored tree (Fig. 225), as nut-like fruits (Figs. 226-228), 

 near the top of the coal-seams, and sometimes as drift- 

 logs in the sandstones, interstratified with the coal. The 

 trunks are known to be 

 conifers by the microscopic 

 structure of the wood, the 

 cells of which are marked 

 with circular disks on lon- 

 gitudinal section (Fig. 229), 

 and 011 cross-section the 

 wood is destitute of pores. 



Now, what kind of coni- 

 fers have such leaves and 

 fruit as these ? None but 

 the yew family. All of these FlG m _ Longitadinal sec tion of wood 



have plum-like fruit with of a living conifer, magnified. 



nut-like seeds, and many of 



them have broad leaves (Fig. 230). The cordaites (Fig. 



225) has been found with trunk sixty to seventy feet 



FIG. 230. Living broad-leaved yews. 

 LE CONTK, GEOL. 20 



