There is no indication that sub-surface 
waters had anything to do with its forma- 
tion or that any part was due to sedimen- 
tation or deposition in surface waters. 
Quartz crystals and chalcedony, suchas 
are common at the Ocean Terrace locality 
and near Four Corners, which clearly in- 
dicate if not prove the action of thermal 
waters, (See paper by L. P. Gratacap in 
our Proceediugs for Mch. 13th, 1890,) are 
wanting at the locality now under discus- 
sion; but quartz does occur there in a 
unique form, as rounded masses, having 
a radiating or rosette structure, and vary- 
ing from single specimens the size of a 
pea or walnut to irregular aggregates of 
these as large asa goose egg. They may 
be found in considerable quautity, free, 
in the decomposed tale or chlorite, and 
are evidently merely auother of the re- 
sults of decomposition of the serpentine 
iu place. This particular form of quartz 
has not heretofore been reported from 
Staten Island, nor am I familiar with it 
from elsewhere. 
A magnetite drift bowlder. An interest- 
jog drift bowlder was found in the bed of 
the brook at the lower end of the Black 
Horse ravine, composed of magnetite, 
graphite and pyroxene or hypersthene. 
It so closely similar to certain of the 
Adirovdack rocks that we are justified in 
cousidering it as having been derived from 
- that region, especially as thereis no other 
rock outcrop with which it could be 
identified elsewhere on the line of glacial 
movement towards Staten Island. 
In this connection it may be of interest 
to recall that a bowlder of labradorite, 
probably also derived from the same 
region, was fouud at the base of Rich. 
mond Hill some years ago and noted in 
our Proceedings of Oct. 10, 1885. 
Fossiliferous drift bowlders. A number 
of drift bowlders containing fossils have 
recently been found, some of whici have 
yielded species new to our local list. 
At our meeting of last September, in 
dl 
discussivg the geological features of the 
Fox Hills golf links, I commented upon 
the scarcity of limestone bowiders Since 
then a small specimen of Lower Helder- 
berg age was found there, containing Ano- 
plothecu concava (Hall), Trematospira costata 
Hall, Dalmanella perelegans Hall, and 
Leptena rhomboidaiis rugosa (Hall),—the 
last three species not before recorded from 
the Island. 
In the vicinity of Eckstein’s brewery, 
at Four Corners, was found a fragment of 
Hudson shaly san:istone, containing a 
specimen of Ambonychia radiata Hall,—a 
species previously reported only from 
Kreischerville. 
Ou the beach, between Woods of Arden 
and Arbutus La™e, three interestiug finds 
were made, as foilews: 
I. Lower Helderberg limestone, con- 
taining Orthothetes Woolworthanus (Hall), 
Spirifer macropleura (Ccnr.), Rhipidomella 
oblata Hall, Hutonia medialis (Vanux.) 
Meristella lata Hall, Dalmanella subcarinata 
Hal, Dalinanelia perelegans Hall, Leptena 
rhomboidalis rugost (Hall) and Ortho- 
strophia strophomenotdes Hall,—the latter 
another addition to our list. 
2. Oriskany sandstone, containing 
Chonostrophia complanata Hall, Dalmanella 
subearinatu Hall, Spirifer submucronatus 
Hall ana Spirifer Saffordi Hall,—the last 
two being further additions to our list. 
This bowlder a!so contained dismembered 
parts of a trilobite, apparently a Dal- 
manites, but two fragmentary for specific 
determination. 
3. Triassic shale, with poorly preserved 
impressions of Loperia simplex Newb an} 
a conifer, apparently Cheirolepis Munstert 
(Schenk) Schimp. O:dinarily such speci- 
mens wonld be too poor to merit attention, 
bu: our local Triassic material has yielded 
so few fossils that even these are of inter- 
est forus. The only others in our collec- 
tion are impressions of algae from the 
outcrop at Mariners’ Harbor, described 
in our Proceedings for April 11th, 1889, 
