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Post by Lady B on Aug 14, 2007 21:20:20 GMT -5
I recently made a splediferous purchase from Steve Holmes. In a super-packed box of geodes and rocks, Steve also put in this neat little rock. He wrote the following about the rock: the green one is,; I believe, a gastrolith aka gizzard stone. When I sliced it in half, I thought it was a fossil as well....but I really don't know. It's unusual and a first for me. Steve So Steve doesn't quite know what this is and obviously I don't either or I wouldn't be posting this thread. Can someone tell me please what this might be? If it's a fossil it goes in the mirrored curio cabinet. If it's a rock with just a neat design on it, Bob gets to cab it. Please help. Thanks a Bunch! Lady B
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Post by texaswoodie on Aug 14, 2007 21:44:33 GMT -5
Don't know for sure Bob, but I think that one is going in the curio cabinet.
Curt
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Post by flintfish on Aug 16, 2007 6:24:24 GMT -5
Hiya Lady Beabea, My first thought at first sight was - is it a fossil anemonie, so I went a searching. I spotted this example which is somewhat similar in many ways, I'm clearly not certain as to what you have got there, hope this helps a little. Thanks and Good luck in finding out! Harry.
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fossilman
spending too much on rocks
Member since April 2007
Posts: 256
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Post by fossilman on Aug 18, 2007 23:13:11 GMT -5
looks like the first one is a cross section of a sponge. The second one is an Ediacaran age soft bodied animal from Australia, Dickinsonia. Very rare, I had one once similar to this.
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,472
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Post by Sabre52 on Aug 19, 2007 0:16:31 GMT -5
Hmm. Wish the matrix was clearer in the pic. Dang! Some of the little round things look almost like small crinoid stem section debris. I've seen horn coral with crinoids. Lots of horn coral in Utah. Maybe a coral cross section? Usually gastroliths are siliceous stones though . Is it quartz hard or soft like limestone? Again, the matrix is somewhat unclear. Is it granite looking stuff? If so, I'm thinking because of the granite looking matrix, that it might not be of organic origin at all but rather one of the forms of orbicular diorite composed of hornblende, quartz, biotite and feldspar which sometimes crystallize in that manner....Mel
PS Never mind the diorite thingee. I blew the picture up to the limit of my picture program and those definitely look like little donut shaped crinoid stem sections. I'll say some kind of fossil cross section, probably a rugose ( horn ) coral. Anyway, that's my story and ahm stickin to it *L*.
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fossilman
spending too much on rocks
Member since April 2007
Posts: 256
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Post by fossilman on Aug 19, 2007 13:38:25 GMT -5
a rugose coral is a good guess, but the cross section doesn't have quite the distinct patterns of rays in it you normally see, unless the recrystallization has removed some of that detail. There are quite a nnumber of crinoid stems in the rock, but they still have the very distinct patterns.
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SteveHolmes
fully equipped rock polisher
Member since July 2009
Posts: 1,900
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Post by SteveHolmes on Aug 19, 2007 19:31:55 GMT -5
Kate, Thanks for posting a pic of that rock. And thanks fossilman, Harry and Mel for figuring out what the darn thing is. Here's two more pics... Steve
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