986 T. N. Dale—Geology of Rhode Island. 
Compton it seems probable that the former overlie the latter 
unless we suppose the protogine to recur under water on the 
east side of Sachuest Neck. Serpentine in layers and minute 
veins is characteristic of the siliceous argillytes, and Jackson 
found that in the northern part of the State chlorite and horn- 
blende slate are followed by dolomite or serpentine, i. e the 
chloritic rocks underlie the serpentines. From these data it 
seems somewhat probable that the true position of the siliceous 
argillytes with serpentine is above the chloritic argillytes with 
dolomite. 
The lowest rocks of certain Carboniferous age, the quartz and 
clay aggregates of Sachuest Neck, recur at Rose, Coasters 
Harbor and Conanicut Islands. Lying upon them in Mackerel 
ove, and also probably at Coaster’s Harbor Island, are the 
argillaceous schists with siderite and pyrites, in all probability 
belonging to the same horizon as the Easton’s Point argillytes 
with pyrites (lower argillytes of first paper) which there under- 
lie conglomerate II, and which, on account of their relation to 
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the outcrops of conglomerate above the “Cliffs” series to which 
Professor Ch. Hitchcock alludes on the east side of Almy$ 
Pond, and which he coérdinates with that of Miantonomah 
il]. What relations exist between the coal-measures of “ The 
Cliffs” and the epidotie and chloritic schists south of Sheep — 
Point is uncertain. A fault has been supposed and the slicken- 
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