INDEX TO MAGNETITE IRON DEPOSITS OF NEW YORK 
Magmatic-replacement deposits, 70 
Magnetite deposits, 41-73 
Magnetite ores, location, 5-6, 41-48; 
brief history, 7-30; origin, 8, 68; 
structural features, 55; character, 
65; composition, 67-68; mines, 74- 
126 
Mahopac granite, 28 
Mahopac Iron Ore Co., 19 
Mahopac mine, 21, 36, 47, 48, 57, 
61, 65, 66, 67, 72, 74; map facing 
p. 124; description, 124 
Manhattan group, 18 
Manhattan schist, 11, 28, 35 
Martin, J. C., mentioned, 59 
Mather, W. W., quoted, 8, 9, 118, 
121; mentioned, 50, 76, 93, 94, 95 
Mercia lewncttoteds NS l7n TS 
Metamorphic minerals, 8 
Middle mine, 43, 90 
Miller, W. J., quoted, 61, 69; men- 
tioned, 59 
Mines, magnetite, 74-126 
Modified Pochuck-Grenville, 51 
Mohawk limestone, 10 
Mombasha mine, 45; description, IIo 
Monoclinal structure, 33 
Monroe, 6 
Morehead mine, 44, 63, 75, 84; de- 
scription, 88 
Mount Summit Ore 
114 
Mountain mine, 36, 43, 64, 75, 90; 
description, 94 
Myrmekitic intergrowths, 95 
Corporation, 
Nason, F. L., quoted, 21, 22, 23; 
mentioned, 33, 59 
Natural history of New York, 9 
Nelson mine, 20, 74, 114 
New Jersey, geological survey, 7-11, 
15, 59, 70 
New Jersey, index map, frontispiece 
New Jersey, State Geologist, annual 
report, mentioned, II, 12, 15, 23 
New York Academy of Science, An- 
nals, 59 
New York City Folio 83, 
tioned, 14 
men- 
159 
Newland, D. H., acknowledgments 
to, 6; retirement from state serv- 
ice, 6; quoted, 77, 103; mentioned, 
59, 69, 90 
Nutall, Thomas, mentioned, 8 
Ogilvie, I. H., mentioned, 59 
O/NeillPinines yy 4ShsO ws 75) OOsmnde= 
scription, 109 
Orange county, 6, 19, 41, 42, 45, 70; 
isolated deposits in, 106 
Orange county zone, map showing 
two subsidiary ore belts, fig. fac- 
ing p. 84 
Ores, see Magnetite ores 
Orthotectic, 71 
Oscawana Corners, 41 
Parrott Iron Company, 97, 107 
Parrott mine, 45, 50 
Passaic quadrangle, 24 
Patterson mine, 43, go 
Peekskill, 6 
Peekskill diorite gneiss, 40 
Peekskill granite, 26 
Phillips vein, 36, 41, 45, 64; descrip- 
tion, IIO 
Pierce, James, mentioned, 7 
Pinches, 55 
Pineswamp mine, 97 
Pneumotectic, 71 
Pochuck, 49, 51 
RochuckypeneisswiicAnneonn2o wo: 
Bi 
Pochuck granite, 38, 40, 52 
Pochuck-Grenville, 40, 50, 63 
Roa, S83 We, fh KO 
Pompton mountains, 7 
Port Henry, N. Y., 60 
Post-Grenville, 49 
Poughquag quartzite, 9, 28 
Pratt mine, 20, 46, I12 
Precambrian complex, nature of, 36 
Precambrian complex of the High- 
lands overthrust, fig. p. 35 
Precambrian crystallines, origin of, 
31 
Precambrian igneous intrusives, 49 
