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Dwarves' Earth Treasures Museum:
Stillwater Agates
Stillwater Ranch, south of Marathon, Brewster Co., Texas
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        I know of Stillwater Ranch south of Marathon along route 385, but I haven't visited that ranch. I picked up info that the access to the agate source in Stillwater Ranch somewhat became more restricted, so it may not worth about 100 miles of driving from Apline, Texas to get there.   I did pick up a small box of agates labelled "Stillwater" from an old collection and I haven't had a chance to cut all of them. I was actually surprised to get one with amethyst core in one of them and other with strong shadowing effect.

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Rough Appearance: White rough nodules but can be confused with any other white nodules. Only labels will tell.
Colorless to gray banded agates, sometimes with amethyst cores.
With Amethyst cores Strong shadowing effect (parallex) 
No big picture of that pair yet