1. 



3. 



4. 



6. 



VIEWS ALONG MAZON CREEK, ILLINOIS. 



A nodule weathering out of the shale, at the head of the hammer. Most of the nodules 



at the so-called "lower beds" contain specimens of Ntumfitrv. 

 The nodules in the creek bed at the "upper beds." Many of them have been cracked 



open by the frost. 

 Looking south at the "upper beds." The nodules found in the background are 



non-fossiliferous. 

 Nodules may be seen through the clear water embedded in the shale. Neuropte 



insects in the water. 

 Looking for nodules at the "upper beds." The uppermost reaches of the fossiliferous 



beds correspond with the extreme background of the picture. 

 Nodules in .lie stream bed at the "lower beds." Many of these a.e cracked open by 



the frost and good specimens are sometimes found in the nodule! 



