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Crinoid and various shell plate prep?


IonRocks

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So recently I took a trip to Nebraska and I found these two plates

post-19394-0-48458000-1448763610_thumb.jpeg

post-19394-0-17026700-1448763895_thumb.jpeg

I'd like to prep them, but I don't know where to start!

I've really only got dental tools, and an electric engraver. (And a Dremel, but I don't think that's helpful here)

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The one plate has a nice crinoid stem that is already mostly exposed

There is also lots of other fossils, but I don't have pictures of them yet

post-19394-0-11182900-1448764142_thumb.jpeg

Edited by IonRocks
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I have had good luck with short applications of VERY diluted muriatic acid on crinoids in limestone/limey sandstones.

If you don't let it sit long, and remember to dilute the acid, you won't etch the fossils. You can also start with vinegar, but you still don't want to let it sit in it.

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