GRANITE OF NEWPORT CLIFFS. 315 



tained numerous cavities toward the contact, the cavities having later been 

 filled with a greenish mineral. This occurrence of apparently amygdalar 

 structure is itself suggestive of the igneous origin of the greenish rock. 

 But it may result from replacement of contact minerals originally due to 

 the intrusion of the great granite mass into the greenish rock. 



GRANITE AREA AT THE SOUTH END OF THE CLIFFS. 



The granite nearer low-tide mark is in actual contact with the greenish 

 rock, maintaining its coarse grain and the large size of its phenocrysts to 

 the contact. Farther from low tide, somewhat nearer the cliff walk, a 

 band of the pinkish fine-grained aplitic rock already mentioned intervenes, 

 the granite terminating abruptly against this rock, preserving the coarseness 

 of its grain and the large phenocrysts as far as the actual contact with the 

 pink aplite. The pink aplite at this point begins with a much finer 

 grain, and preserves this to its actual contact with the green rock. The 

 width of this band of pink aplite is 6 to 8 inches. Toward the sea it 

 partly includes fragments of the greenish rock between its mass and the 

 granite. Nearer shore it enters the granite mass at one point with a less 

 sharp contact, allowing the granite to come in contact with the green rock. 

 The pinkish aplite penetrates the greenish rock in dikes along- the shore, 

 one of these dikes being much coarser in grain and showing more granitic 

 character, having apparently possessed both macroscopic feldspar and horn- 

 blende, but no phenocrysts, and not attaining the coarseness of grain of the 

 main granite mass. Some of these facts suggest that the granite is more 

 recent than the greenish rock. Nothing definite can be stated. In many 

 places the granite is itself frequently cut by the pinkish aplite. The 

 most northern exposure of the granite on the east shore is a little north of 

 the great bend where the southerly trend of the shore from Sheep Point 

 changes to the more rugged southwestern trend of the shore toward Cog- 

 geshalls Point. Thence it occupies the entire line of the shore as far as 

 Baileys Beach, south of Almys Pond. 



A greenish rock, appearing like a dike, occurs in the most northern 

 exposure of the granite just before reaching the beach. Another greenish 

 rock, parallel to this, contains brecciated fragments — probably of the 

 same general mass, but looking whiter in consequence of weathering — 

 and also one pebble of undoubted quartzite. At the eastern end of the 



