FOSSIL VERTEBRATES 



93 



the plaster has fully set, the block may be cut or broken loose 

 and turned over. Trim off the excess matrix and bandage the 

 newly exposed side. It is good practice to leave an inch or more 

 of matrix adhering to the bone rather than to clear the surface 

 entirely on the lower side. 



Fig. 50. — Bandages of plaster and burlap. 



The block should now be plainly marked with its field or 

 other identifying number. "When thoroughly dry it is ready for 

 packing, 



In collecting large blocks by the method described certain 

 modifications of the process are necessary. First, the block should 



