FOSSIL INVERTEBRATES AND PLANTS 



107 



a small area, then collect a small sack of the shale for washing 

 and sorting in the laboratory. 



Fig. 63. — Two kinds of nautiloids. 



Fossil plants. — Should traces of fossil plants be discovered on 

 an exposed slope, first prospect the slope from bottom to top 

 to locate the source of the fragments. Then open a quarry with 

 pick, shovel, and bar if necessary, by removing an area of cover 



