Insanely Complicated Pony Butte Thunderegg

The most complicated and feature-rich thunderegg I have seen yet, and as such might even merit that much mis-used and vague term 'museum-grade'. As can be seen from the detail shots below, it is actually a triple thunderegg - with two eggs cut through and a third intact behind and whatever is in there remains a secret. Not only that, but the secret half actually rattles. There is something loose inside. The visible half contains dark agate on the left shot through with a huge plume of moss 'invading' from the right - as well as a few worm-line 'moss' filaments coiling through the agate itself. There is a wonderful botryoidal (cushion like) cavity that might or might not link in with the third egg at the back. Lastly, it possesses beautiful water leveling lines running through it.

From the "PONY BUTTE" Deposit on Richardson's Ranch in Eastern Oregon, near Madras