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same class occurs near Paso, west and south of Lovelady in Houston county, and Pennington in Trinity county.

A deposit of gray sandstone occurs near Alto in Cherokee county. This deposit, however, is much broken, the stones lying in immense blocks and covering an area of fifteen or twenty acres with a few outlying deposits within a radius of a mile or a mile and a half.

The yellow altered greensand rocks occur almost wherever the greensand is to be found. These have, however, already been described in the First and Second Annual Reports of the Survey. "

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First Annual Report, pp. 86-89.

INFUSORIAL EARTH.

Large quantities of infusorial or diatomaceous earths occur in association with the gray sandstones throughout the whole area, but the most extensive deposits are found in the northern portion of Walker county, where it is popularly known as "chalk." Quantities of this earth were mined and shipped north a few year ago, but for some time no work of this kind has been done. In this region the "chalk" is from six to ten feet thick and is reported to cover an area of several miles.

CLAYS.

No detailed description of the clay deposits found and examined during the course of the season's field work can be given at present. Many of them have already been described and the others are now in the laboratory of the Survey awaiting examination.

In practical use many of these clays are proved to be well suited to brickmaking and others are shown by analysis to be of proper composition for the manufacture of sewer pipes and vitrified paving bricks as well as a fair grade of fire bricks. Some others are sufficiently fine for use in the coarser class of pottery and earthenware.

Respectfully,

W. KENNEDY,
Assistant Geologist.