1881.] Geology and Paleontology. 4it 
formed by the upturned edge of the thickest of a series of sheets 
of ore, which rises like a ledge of bedded rock two or three hun- 
dred feet above the adjacent low lands. This outcrop is visible as 
a conspicuous black hill, at a distance of several miles. The con- 
nections between the ore bodies of this great iron belt are 
obscured by the dééris from the easily decomposed trachyte and 
granite. It is evident, however, that for some miles the iron ore 
deposits are continuous or separated by very short intervals, = 
the outcrops occur within a stone’s throw of each other, and the 
surface is everywhere strewed with blocks of rich magnetic ore, 
enough in themselves to supply all the furnaces of the gag 
for years. It would seem that the iron forms a number of ee 
tinct and closely approximated belts, which are the ourctonn 
beds that stand nearly vertical, and go down into the earth like 
huge walls. 
dense hematite. Across a narrow valley from this group the é a 
Side is covered with fallen fragments of a rich but soft and ras 
hematite, and at no great distance the soil is colored blood-re “an 
the decomposition of a hematite so soft as to make no mn 
show above the surface. Near this latter location I noticed a f es 
of outcrop of a very jaspery hematite, in some places mae A a ol 
"uginous jasper closely resembling some of the more silici 
ores of the Marquette district, : its, I 
As to the age of this remarkable series of iron ore deposits, 
cannot ask with absolute certainty, though they are apparen 
wer Silurian. i 
The granite of the hills which contain the iron is finer ine 
and less compact than that which forms the great granitic “of the 
the Wasatch, and I suspect is the metamorphic condition of ts 
