Casts of Scolithus, etc. — Wanner. 
37 
surface of fracture, at right angles to the plane of bedding, 
that being the direction in which the rock easiest breaks. 
This whole surface is lined with Scolithus, extending at right 
angles to the plane of bedding^ and displaying the invariable 
parallelism of the casts. In this exposure the average dis- 
