i 



22 original; 23 counterpart. This slab shows the ice crystals, 

 " Fucoides," lying on a surface of the sand in which is buried a 

 goniatite shell (Manticoceras) and over which have been dragged 

 two objects, presumably rough-edged stones set in ice, which have 

 made deep and clearly striated channels. The interspaces show a 

 fine parallel striation. It is seen that the ice crystals of the 

 " Fucoides " formed on the sand after the grooves were made. 



[228] 



