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Dwarves' Earth Treasures Museum:
Richardson Ranch Thundereggs
Red Beds of Richardson Ranch, 
Madras, Jefferson Co., Oregon
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    The Pridey Beds, Red Beds, Pony Butte, and Plume Beds now owned by Richardsons are one of most well-known thunderegg sites for many decades and it happens that the thundereggs are made the State Rock of Oregon. They may be most common encountered and most studied thundereggs anywhere, but even so and as expected of any agates and thundereggs, great pieces seem to be rare. The best specimens would show alternating and constrasting layers of white, gray and black agate "waterlines" or highly constrasting and concretic bands with some splash of colors such as red, deep blue, black, and yellow. Many thundereggs are also known to contain white to brown (sometimes red) moss/plume structures made of the minerals that have grown first before being covered by agate.

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Rough Appearance:  Oval thundereggs with geometric ridges, sometimes missing rhyolitic top & bottom caps, can be in clusters.
White opal "waterlines" are norm in the thundereggs, but colorful banded and waterlines agates can be found, often with weird inclusions.
It should be noted that the thick caps are the top and bottom of the thundereggs and "waterlines" are parallel to the caps.
Difficult to distingish between the uncut thundereggs of Blue and Red Beds.
Rare Red Moss Agate, Red Beds
 Typical thunderegg
Rare star shaped cavity resulting from a proper cutting orientation 
(normally four-point or boxlike caviies are obtained)		 Opened a "Can of Worms"!
 Some minerals filaments were peeling from the walls
before they got "frozen" by agate formation.		 Mossy inclusions
Look at all of the "worms" in the thundereggs!  Rare highly detailed agate with moss inclusions

Typical thunderegg but with colorful agate from "Tourist Zone" (pertile beds)