The eastern part of Williamson County is in the black land belt of Texas where roads must be surfaced to be passable in wet weather. Road materials are scarce in this area, so much of the time spent on the mineral resource survey was concentrated on finding gravel.

Fuller's earth is being produced in the southern part of Angelina County by the Milwhite Company and by Bennett and Clark. Bentonitic clays are found in both Angelina and Cherokee counties.

The Neyland quarries are located 15 miles northwest of Fredericksburg, on the Doss road. To reach the location from the courthouse in Fredericksburg, proceed northwest on the Mason road a distance of 11 miles to the junction of the Doss road. Turn to the left on the Doss road and go 4.2 miles to a pasture gate; turn to the right and proceed about one-fourth of a mile to the workings. The road is paved to Feidlers store at the road junction of the Doss and Mason roads. From Feidlers store, the road is a good all-weather road the remaining distance to the mine.