Vol, 60.] 



IGNEOUS ROCKS AT SPRING COVE. 



165 



the naked eye, while a microscopic examination shows the oolitic 

 grains distinctly, together with the remains of encrinites, etc. ; and 

 the basalt has penetrated, fused, and absorbed the limestone along 

 its borders. 



FjV 5. — Junction of the basalt and an included mass of limestone. 



Fig. G. — Included lamp of limestone in basalt. 



A thin slice through the junction of the basalt and an included 

 mass of limestone [30 c] shows that the basalt, here a brown, yellow, 

 red, or green glass, in places distinctly variolitic, penetrates and 

 absorbs the limestone, which is turned yellow and red, owing to the 

 staining of iron-oxide ; while, along the edge of the limestone at 



