FREDERIC H. LAEEE 



Fig. 4. — Ilmenite and biotite meta- 

 crysts in a rock having good flow 

 cleavage. 15 diameters. 



Fig. 5. — Outline sketch of Fig. 4. 

 The ilmenite crystals lie parallel to 

 the schistosity. One of them and the 

 biotite contain inclusions of quartz. 

 The irregularities of both ilmenite and 

 biotite are due to growth of these 

 minerals against the constituents of 

 the groundmass. 



Fig. 6. — Photomicrograph of a rock 

 belonging to "Stage D." The quartz 

 is all secondary. The schistosity is 

 well developed. An ilmenite lath 

 with two quartz inclusions lies par- 

 allel to the schistosity. (See Fig. 7.) 

 10 diameters. 



Fig. 7. — OutUne sketch of Fig. 6. 

 Shows position of the ilmenite crystal, 

 and its relation to the flow cleavage. 



