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Dwarves' Earth Treasures Museum:
Buchanan Thundereggs
Buchanan Ranch Mine, 
southwest of Succor Creek, Oregon
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     The Buchanan Mine was once a fee collecting site open to the collectors, but recently it was closed for some reasons. When the mine was first opened, the thundereggs with fully silificied hard shells have been found, but as the mining progresses into lower levels, those with "rotten" and porous unsilificated shells are becoming more typical, hence, "New Buchanan thundereggs". The interesting about the "New Buchanan" thundereggs are that some contain reddish cinnabar inclusions.  Most thundereggs contain messy looking waterline agates, neat waterlines or both of those types and it's difficult to tell which way to cut since they are quite rounded without any ridges showing. The "messy" look resulted from cracking and flaking of each silica when it dried after being seaonally deposited.

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Rough Appearance: Looks like bunch of bubble clustered together, old ones have green to brown colors while new ones have "bleached" tan color.
Agates are typically messy-looking waterlines sometimes with reddish tints due to cinnabar inclusions.

"Old" Buchanan thundereggs with harder and silificied shells "Old" Buchanan thundereggs
with harder and silificied shells
"New" Buchanan thundereggs with poorly silificied porous shells
may contain cinnabar inclusions.
 Black and white colors with 
a orange pseudomorph