NODULAR-BEARING SCHISTS 497 



which is full of rutile needles to an unusual extent. The needles 

 seem to be arranged in approximately parallel positions, and are 

 so numerous that they create false lines of cleavage in the 

 quartz, it cleaving readily in one direction and with more diffi- 

 cult}' at approximately right angles to this. The sagenitic 

 structure common to rutile needles when they occur in quartz in 

 large amount does not appear to be anywhere present. 



The occurrence of the two schists in such proximity, and 

 both containing nodular segregations, would lead one to suspect 

 that there must be some connection between them. Speculation 

 upon it with present data is useless, however. After further 

 study features of great geologic interest may be discovered. 



In concluding I wish to thank Dr. W. C. Knight for the 

 notes and specimens put by him at the disposal of the writer. 



Thomas T. Read. 

 Department of Geology, 



University of Wyoming, Laramie. 



