PLATE XLII. 



Fig. a. 



(Sp. No. 23754. Without analyzer, x 38.) 



A moderately fine grained liornblende-gabbro showing parallel texture. This hornblende- 

 gabbro occurs in dikes cutting the coarse forms of hornblende-gabbro. The specimen shows yery 

 clearly the parallel texture rather commonly found in sections from these dike rocks. This texture 

 is best developed nearest the contact, and is presumed to be a flow texture. The chief mineral 

 constituents — plagioelase, hornblende, and mica — can be readily distinguished in the section. 

 (Described, p. 244.) 



Pig. B. 



(Sp. No. 23754. With analyzer, x 38.) 



The parallel texture in the hornblende-gabbro is brought out somewhat better when viewed 

 Tjetween crossed niools. (Described, p. 244.) 



