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CHERT.

From the lead-zinc region of southwestern Missouri and its extension into Kansas.

Collected by W. P. Jenney.

A. Unaltered chert, East Hollow, Belleville, Jasper County, Missouri. B. Partly altered, same locality.

C. Altered to "cotton rock," same locality.

D. From the Surprise mine, Joplin, Missouri.
Analyses by E. A. Schneider, record No. 1205.

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E. Blue chert, unaltered, Bonanza shaft, Galena, Kansas.

[blocks in formation]

Analyses E, F, and G by E. A. Schneider, record No. 1205; H and I by L. G. Eakins, record No. 1208.

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SILICEOUS SINTERS.

From the Yellowstone National Park and similar localities. Described by W. H. Weed in 9th Ann., p. 619. Analyses A to H, inclusive, by J. E. Whitfield, record Nos. 97, 100, 707, 708, 812, and 998; analysis I by E. A. Schneider, record No. 1254. A to E from Yellowstone National Park.

A. Dried siliceous jelly from Emerald Spring, Upper Basin.

B. Sinter from Solitary Spring, Upper Basin.

C. Grayish sinter from margin of Splendid Geyser.

D. Compact sinter from Old Faithful Geyser.

E. From Asta Spring, Hillside Group.

F, G, H. Three samples of sinter from Rotorua, New Zealand. For comparison with Yellowstone sinters.

1. Sinter from Mount Morgan gold mine, Queensland, Australia. Described by Weed in Am. Journ. Sci., 3d series, vol. 42, p. 165.

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[blocks in formation]

A. White marble, Rutland, Vermont. Analysis by L. G. Eakins, record No. 1213.

B. The portion of A insoluble in dilute hydrochloric acid. Same analyst and number.

C. White marble, Lee, Massachusetts. Analysis by E. A. Schneider, record No. 1279. Described by Diller in Bull. 150, p. 299. P. R. C.

116.

D. Limestone, Lee, Massachusetts. From cut on west side of railroad. record No. 1654.

Collected by B. K. Emerson. Analysis by George Steiger,

E. Dolomite, Charlemont, Massachusetts. Collected by Emerson. Analysis by Eakins, record No. 1343.

F. Dolomite, Webster, Massachusetts. Analysis by H. N. Stokes, record No. 1634.

Collected by Emerson.

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NEW YORK, PENNSYLVANIA, MARYLAND.

A. Dolomite-marble, New York Quarry Company, Tuckahoe, Westchester County, New York. Analysis by W. F. Hillebrand, record No. 746.

B. Hydraulic-cement rock, Akron, New York. Analysis by George Steiger, record No. 1655.

C. Compact gray limestone, Greason, Pennsylvania. Analysis by E. A. Schneider, record No. 1279.

D. Dolomite-marble, Cockeysville, Maryland. Analysis by Schneider, No. 1279. P. R. C. 117.

E. An earlier sample of D. Analysis by J. E. Whitfield, record No. 827. P. R. C. 117.

Rocks B, C, D, E are described by Diller in Bull. 150, pp. 127, 133,

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VIRGINIA And west VIRGINIA.

A. Limestone, upper ledge, Moundsville Narrows, West Virginia. B. Same as A, lower ledge. Analysis A and B by T. M. Chatard, record No. 127.

C. Trenton limestone, Lexington, Virginia. Analysis by R. B. Riggs, record No. 365.

D. Limestone, Staunton, Virginia. Analysis by George Steiger, record No. 1630.

E. Part of D insoluble in one-tenth hydrochloric acid.

F. Soluble part of D. Analyses E and F also by Steiger, same number. These three analyses are accompanied by analyses of the residual clay, formed by the weathering of the limestone. See section on clays.

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