L. N. Dale—Geology of Rhode Island. 289 
- Quartz and clay aggregate—A’ highly metamorphic, 
coarsely stratified, dark gray or black aggregate of very coarse 
quartz grains and fine argillaceous matter, including a few 
layers of fine, carbonaceous slate with Carboniferous plants. 
Annularia longifolia. Veins of milky quartz. 750’. 
5. Sideritic argulyte—(Lower argillaceous schist of first 
Peper) Light and dark gray, argillaceous, in some places . 
ydro-micaceous or talcose, schist, generally with disseminated, 
ron pyrites, in several localities striped, light and dark, across 
the bedding. Veins of milky quartz with chlorite, frequently 
also with ferruginous, crystalline calcite. One or two veins of 
argillaceous rock with cubical iron pyrites. 600/-2000’. 
uartzyte Conglomerate.—(1st and 2d conglomerate of Ch. 
6 
. Hitchcock, Conglomerate II of first paper) consists of large : 
Pebbles and bowlders of finely stratified quartzyte with a little — 
a lea (or very quartzose mica schist), containing, in certain 
ccalities, Lingule, and cemented together with an argillaceous 
snd siliceous, in places a micaceous cement containing crystals 
_ OF magnetite. Veins of milky quartz. (“ Paradise,” “ Purga- 
tory,” ete.) 750’, F 
28, 9. Coal-measwres.—Alternating dark and light gray, 
argillaceous schists (sometimes ochraceous or with minute fer- 
eh beds of plumbaginous anthracite. At D 1 
argillaceous schists are replaced by garnetiferous, mica schists 
I hist.* “Veins of milky quartz, rarely with chlorite, at Dutch 
sland both hyaline and milky, with feldspar. ay 
be hese beds give a total thickness of seo 
» OY, supposing 1 to be synchronous with 1. 
12,850’. Of ‘iene Git Nos. £9, or 3700'-4100’, 
$f Carboniferous age. Professor Shaler assigns No. 3 to the 
timordial, but it is unfossiliferous as are all below 4. Prof. 
W. 0. Crosby, 
are certainly 
Hunt refers 2 and 8 to the Huronian. Mr. W. eee 
tallized siderite, — a 
* At the Portsmor es cies ; 
: G ith coal mines, in this basin, crystallize 
and calcite, as well as graphite and asbestos, occur in proximity to the coal beds. 
00 to 13,800 
of 8,250! to 
ae uae a few layers of garnetiferous, hornblende or chlorite = 
rk 
