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Dwarves' Earth Treasures Museum:
Potato Patch Thundereggs
Wiley Well District, south of Bythne, California
    Originally called "Hauser's Hole", the "Potato Patch" described digging for the thundereggs was like digging for potatos. Joel Hauser's father first noticed the thundereggs as he ttook his usual freight routes to the west in the 1920s. Guided by his father, Joel did some digging in that area in 1930s. The reports of his finds eventually sparked the decades worth of rockhounding activity. Even withwith those decades of activity, I'm surprised that I still find the thundereggs there. There are several lobes of thundereggs in the vicinity of Potato Patch area and they're not quite identifical.
  The first diggings in the greenish weathered pertile bed along a ridge to the west of the road produces the greenish-skinned thundereggs that are mostly geode type, Some thundereggs are found with white to dark gray banded and "waterline" agates. The pockets on the east side produced bubbly reddish thundereggs containing small cavities filled with dark but colorful agates. I would say that the western side of the Potato Patch is the best place for anyone who want to find the thunderggs with banded agates and I'm not confident about those on the eastern side since they seem to be heavily searched (I found only "leftovers").

Further Information on Black Hills Bed can be found at this DesertUSA.com

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Thundereggs dug by Jeffrey Anderson, December 2009

My small but best find of west side Typical waterline agate  (west side)
Waterline agate with reddish hue (west side) Colorful agate from east side.
Yellow, blue and black agate,
from east side		 Psudeomorph!
From east side

Typical thundergg with small agate-filled cavities
from the east side of Potato patch.