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[safossils]

I've heard it called turtle back, but that does not seem right....

[rocks2dust]

Looks like Turtleback agate to me. After cutting across the bubbly structure, the fibrous nature of agate preserves the ghost of the botryoidal formations.

Sometimes, Turtleback will show colorful rainbow flashes along the bands or bubbles. If yours has that, you get to call it Iris agate (in addition to Turtleback). Usually only happens in thin pieces, and sometimes you have to look at it against various strong light sources to detect the rainbows. If you find them, those pieces can be quite spendy. Either way, needs to be in an open-back setting so that it can be viewed against the light.

[lithicbeads]

Long been called turtle back. Some of the small streams on the southern Oregon coast seem to have the best but not much of it.

[safossils]

Many Thanks for the info...

Best,
Walt

[lapidaryrough]

 botryoidal Geode,  hollow solid. Brazilian agate.