Minnesota.

The following table shows the sales of stone at Man

kato and Kasota, Minn., for the last three years:

Stone sold at Mankato and Kasota, Minn., 1921-1923

Missouri. The stone from the Carthage district, Mo., used for architectural building and for monumental work is classed as marble and is included in the figures of production of marble in Missouri given on page 218. The crushed stone and low-grade material are included under limestone, but all grades are combined to show the total production in the table below.

Limestone and marble sold in the Carthage district, Jasper County, Mo., 1921–1923

A considerable quantity of marble was also quarried at Phenix, Mo., for use in interior building. In 1923 these quarries sold 203,640 cubic feet of stone, 14 per cent more than in 1922. About 2,700 cubic feet of marble was also sold for building stone from recently opened quarries near Ste. Genevieve.

SANDSTONE

SUMMARY

The output of all sandstone products in 1923 except paving blocks and flagging increased. These products, however, formed only small parts of the total output, which showed an increase of 28 per cent. The report on stone for 1922 contained the names of the principal operators of sandstone quarries and the location of their quarries. The record of sandstone sold or used by the producers in 1922 and 1923 is given in the following tables.

Sandstone sold or used by the producers in the United States, 1922 and 1923, by uses

• Apparent discrepancy-decrease in tonnage despite increase in footage as compared with 1922—is due to revision in factor of conversion. The increase as shown by footage is correct.

Sandstone sold or used by the producers in the United States, 1922 and 1923, by

Sandstone sold or used by the producers in the United States in 1923, by States and uses

BLUESTONE

The figures of production for bluestone are included in those of sandstone, but on account of the local importance of this stone they are also given separately. Except for a few of the large quarries the figures of sales reported by dealers rather than quarrymen are used by the Geological Survey, as more nearly representative of this industry. Stone for curbing decreased, and stone for building and flagging, the other important products, increased.

Bluestone sold in New York and Pennsylvania, 1922 and 1923

Practically all the material included under "miscellaneous stone" is used for road metal, concrete, and railroad ballast. Much of this material is quarried for jobs near the quarries, which are closed when the work is done. Among the varieties of stone included under this heading are argillite, quarried in Arkansas; rhyolite tuff (used as a building stone), andesite, rhyolite, trachyte, and other lightcolored volcanic rocks, decomposed granite, and stone crushed from boulders taken from river beds, in California; phonolite from mine dumps, in Colorado; cherty limestone or flint rock, in Florida; rhyolite, in Idaho and North Carolina; slate, conglomerate, and light-colored volcanic rocks, in Massachusetts; and argillite for crushed stone and mica schist for building and refractory stone, in Pennsylvania. The figures also include some stone, the variety of which is not known, reported by local contractors or operators of portable crushers as the product of roadside workings. There was a large increase in the output of miscellaneous stone during 1923.