Ron E. Posted August 17, 2009 Share Posted August 17, 2009 This was from my hunt last month in Springfield, MO. The rock is claystone, a coarse matrix which doesn't preserve fine details quite as well as that from the Boone here near Bentonville, AR. If you can make out my circles, we have TWO trilobite tails within an inch! That's pretty Mississippian amazin'! Also, note the immaculate lophophore structure on the brach. The cast shows the other side of the equation. Nice rock! I wish it was bit more durable. Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted August 17, 2009 Share Posted August 17, 2009 What your calling the lophophore support is probably the the muscle attachment scar, also that looks more like a packstone or wackstone. Claystones are finegrained. Nice finds, you should be able to find other trilobite parts there. Link to comment Share on other sites More sharing options...
Ron E. Posted August 17, 2009 Author Share Posted August 17, 2009 What your calling the lophophore support is probably the the muscle attachment scar, also that looks more like a packstone or wackstone. Claystones are finegrained.Nice finds, you should be able to find other trilobite parts there. That's kewl too! I haven't encountered much in the way of brachiopod internal workings. thanks, ss! And thanks for the education, the rock looks a lot like my local claystone, but definitely a more coarse texture. Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted August 17, 2009 Share Posted August 17, 2009 The adductor attaches the brachial valve; the diductor the pedicle. Link to comment Share on other sites More sharing options...
Ron E. Posted August 17, 2009 Author Share Posted August 17, 2009 The adductor attaches the brachial valve; the diductor the pedicle. I look forward (soon, I promise) to the day that that clicks in my brain! Link to comment Share on other sites More sharing options...
Shamalama Posted August 17, 2009 Share Posted August 17, 2009 The adductor attaches the brachial valve; the diductor the pedicle. Thanks for the anatomy lesson, I was thinking they were lophophores too. Ron, can you get a better closeup of the bottom circled area in the first photo? Hmmm... think we can get enough lines to make a parody of "head bone's connected to the neck bone" song? -Dave __________________________________________________ Geologists on the whole are inconsistent drivers. When a roadcut presents itself, they tend to lurch and weave. To them, the roadcut is a portal, a fragment of a regional story, a proscenium arch that leads their imaginations into the earth and through the surrounding terrain. - John McPheeIf I'm going to drive safely, I can't do geology. - John McPheeCheck out my Blog for more fossils I've found: http://viewsofthemahantango.blogspot.com/ Link to comment Share on other sites More sharing options...
Ron E. Posted August 17, 2009 Author Share Posted August 17, 2009 Thanks for the anatomy lesson, I was thinking they were lophophores too. Ron, can you get a better closeup of the bottom circled area in the first photo?Hmmm... think we can get enough lines to make a parody of "head bone's connected to the neck bone" song? Will do, but probably tomorrow night. My job requires me to turn in VERY early. Link to comment Share on other sites More sharing options...
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