How Thundereggs Form
The unique, agate-filled mud balls are found in layers of ryholite lava flows which spread over the land an estimted 60 million years ago. This was long before man appeared on Earth and thousands of centries before the Cascade Mountain Range were formed and pushed upward, due to tremendous stresses beneath the surface of the globe on which we dwell. Geologists reason that Thundereggs were formed in gas pockets, serving as molds, left in the lava flows of the Eocene Geological Age. They say further, that, over long periods of time the gas pockets were filled by water actions, percolating through the porous rock formations. Water (hot/cold) oozing into the cavities, carrying rich quantities of silica (quartz) in solution, lined, and in many cases, filled the cavity molds, first with the darker matrix material, then, the inner core of agate or chalcedony. The beautifull colors were derived from nearby minerals present. They also form with agate, jasper, common opal, precious opal, fire opal, ect....
Information used from free paper provided from Richardsons Ranch Thunderegg Beds
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