No. 1 is represented by characteristic material, much of it evidently coarse pegmatite, rich in feldspar.
Nos. 3 and 4 are certainly, and Nos. 5 and 6 probably, from the iron ranges of the Huronian or Keewatin.
The pieces numbered 7 seem to be partly Keewenawan and partly Huronian, while those included under 8 are distinctly Paleozoic.
It
thus appears that the portions decidedly referable to the iron ranges
of the Huronian and Keewatin (Nos. 3 to G, inclusive) make up nearly
half of the whole material (49.4 per cent), while the quartzite. No. 2
(29.8 per cent), is largely Huronian. These rocks are widely developed
north of the Great Lakes and at no great distance from them.
KENTUCKY.
There
has been some revival of speculation as to the existence of diamonds in
the peridotite dikes of northeastern Kentucky. Mr. D. Draper, a
Transvaal geologist, has visited the celebrated dike at Ison Creek, in
Elliott County. The lessees or owners have under consideration a plan
to work a large part of this tract with diamond machinery like that
used at the South African mines, and apparently this entire tract of
land has been bonded and the parties engaged are endeavoring to proceed
to work the place extensively, although up to the present time no
definite proof exists of the occurrence of diamonds in this region. The
examination made there by the Kentucky Geological Survey, under the
late Prof. John A. Procter and Doctor Crandall. and also that made by
Mr. J. S. Diller and the writer seventeen years ago. were both without
result. Recently Mr. W. C. Phalen, of the United States Geological
Survey, visited the region and spent some time in the preparation of an
economic bulletin on the Kenova quadrangle. He located a new outcrop of
the peridotite. but was unsuccessful in obtaining any diamonds. He
heard at Grayson, Carter County, that a diamond or two had been found
in the Ison Creek district, but he could not verify the report.
NEW YORK.
Diamonds in drift.—In the article of Prof. William II. Hobbs, on " The Diamond Field of the Great Lakes," published in 1809a emphasis was laid on the
a Jour. Geol., vol. 7, No. 4, May-June, 1899.
