From the December 29, 1892 New York Times:

“San Antonio, Texas–A dispatch from Carrizo Springs, Dimmit County, says that twenty-five miles south of that place, near the Encinal Road has been discovered an oval-topped mound covered with petrified human skulls. The mound is about 100 feet in height, circular in form, and joined on one side to a short range of hills of about the same height.

On the summit, and for some distance down the sloping side, it is covered with what appear to be smooth, spherical bones, which upon close inspection prove to be petrified human skulls distorted into grotesque shapes.

By removing the sand and loose dirt from the orifices of the face, the unmistakable human countenance is revealed. Bones of other classes are found there, and from all appearances the whole mound is formed of human skulls. The subject of opening the mound has been agitated, but as of yet it has not been done.”