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rock quarry of argillaceous sandstone in several layers. In the stone were found Permian fossils, which show the blendings of the old and new forms of life. In the stone were found species ofProductus, Ammonites, Aviculopecten, Orthoceras, Nautilus, Myalina, and several other forms that were not identified. The fossils are very similar to those in the Permian in the northeastern part of Baylor County.

Among the number of specimens is what appears to be a new Aviculopecten, that I have previously called A. costatus.

Below the stone is a bed of green clay three feet thick, and below that a bed of dark red clay. Bottom not seen.

CONGLOMERATE.

There are two kinds of conglomerate found in this part of the State; one of them composed of small much water-worn siliceous pebbles of various colors, bound together sometimes by an iron matrix and sometimes by a siliceous matrix. This conglomerate is generally very hard, and is more often found as bowlders, yet at places it covers many square acres and seems to be in place. It has been thought that these bowlders were left in their present locality by glaciers, but I am sure they are only the remains of a more extensive deposit that was destroyed at the period of erosion. This conglomerate does not occur as a regular stratum in the series, but is found overlying nearly every stratum in the Carboniferous. It seems to be the same conglomerate that is found overlying the Carboniferous formation in the northern part of the State, of which mention is made in my report published in the First Report of Progress of the Survey last winter. It is not so universally distributed in this part of the State as it is further north; at least it seems to have been more nearly destroyed.

This conglomerate in some localities is very compact, and the bowlders are worn smooth by the driving of sand against them by the wind. The materials of these bowlders are usually bound together by a siliceous cement so compactly that they are as solid as a single mass of quartz, and receive an excellent polish and are very beautiful.

Associated with this conglomerate are the only specimens of petrified wood I have seen, and yet they are not associated in such a way as to show that they were deposited at the same time.

There is another conglomerate found along all the rivers and creeks, made up of fragments of stones from the surrounding strata. This conglomerate was deposited at the same time of the erosion, some of it evidently in the early part of that epoch, and some of it at the very last. I conclude that such is the case from the different heights at which it occurred. At the Colorado River, on the hills west of McAnnelly's Bend, a bed of this conglomerate 7 feet