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C. breviceps trilobite (Read 3744 times)

daves64 Senior Member Offline Rockaholic Posts: 456 Location: Ellensburg WA Joined: Jun 27^th, 2018 Gender:	C. breviceps trilobite Mar 1^st, 2019 at 1:51pm	Print Post
	I recently bought a small, slightly damaged unprepped trilobite found in the Blue Springs quarry in Indiana. I don't have the proper air pens, air abrasives or anything. Just needles, pin vices, a small nylon cleaning brush from an old electric razor & hydrogen peroxide. Pics shows original & mostly finished. I may at some point try to remove the remaining matrix from the crevices, but for now, I'm kind of happy with it. Plus it came with a small extra of a sort.. Pics of that in next post. The bug is 3.5 cm long.

	IMG_3925_thumb_JPG_4008d57ae91b2e44cd36e7bc62ae7ea5.JPG ( 81 KB \| 79 Downloads ) IMG_3926_thumb_JPG_891416e553bf27b84ca7c069db00140b.JPG ( 152 KB \| 75 Downloads ) 1_046.JPG ( 380 KB \| 77 Downloads ) 2_043.JPG ( 466 KB \| 83 Downloads ) 3_043.JPG ( 306 KB \| 82 Downloads )
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daves64 Senior Member Offline Rockaholic Posts: 456 Location: Ellensburg WA Joined: Jun 27^th, 2018 Gender:	Re: C. breviceps trilobite Reply #1 - Mar 1^st, 2019 at 1:55pm	Print Post
	Part 2: I got curious about the 2 short rows of tiny bumps in the red circled area of the 1st pic. Pic 2 is the result. Its a partial molted pydigium of a Glyptambon verrucosus trilobite.

	IMG_3925_thumb_JPG_4008d57ae91b2e44cd36e7bc62ae7ea5_-_Copy.JPG ( 113 KB \| 83 Downloads ) A096_-_20190301_091017.jpg ( 395 KB \| 86 Downloads )
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JoeM God Member Offline I Love YaBB 2.5 AE! Posts: 4211 Location: Wake County, NC Joined: Sep 30^th, 2010 Gender:	Re: C. breviceps trilobite Reply #2 - Mar 1^st, 2019 at 7:34pm	Print Post
	I would be extremely happy with it! Great job! Love the semi-translucence and color of the things. Is that chalcedony now?


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daves64 Senior Member Offline Rockaholic Posts: 456 Location: Ellensburg WA Joined: Jun 27^th, 2018 Gender:	Re: C. breviceps trilobite Reply #3 - Mar 2^nd, 2019 at 8:03am	Print Post
	JoeM wrote on Mar 1^st, 2019 at 7:34pm: Love the semi-translucence and color of the things. Is that chalcedony now? I really don't know what they are now, other than somewhat brittle. And that they are 505 to 438 million years old. I have the molted cephalon (head) of another from the Greenops species that's a dullish opaque black.


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VictorK Full Member Offline RockHoundLounger Posts: 108 Joined: Jul 4^th, 2013 Gender:	Re: C. breviceps trilobite Reply #4 - Mar 3^rd, 2019 at 12:06pm	Print Post
	If the matrix is hard limestone, prepping this must have taken quite a while. How long did it take?


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daves64 Senior Member Offline Rockaholic Posts: 456 Location: Ellensburg WA Joined: Jun 27^th, 2018 Gender:	Re: C. breviceps trilobite Reply #5 - Mar 3^rd, 2019 at 3:46pm	Print Post
	The matrix was actually fairly soft, so it only took maybe 30 hours total over a 4 day period. Worked on it before & after work & on my night off on Thur.


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Scott LaBorde RHL Administrator Offline "Rock it" science! Posts: 2975 Location: Wake Forest, NC Joined: Sep 28^th, 2010 Gender:	Re: C. breviceps trilobite Reply #6 - Mar 4^th, 2019 at 8:18am	Print Post
	Very nice specimens! Good work.

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Laurie Adams Junior Member Offline RockHoundLounger Posts: 95 Location: Denton, NC Joined: Apr 25^th, 2018 Gender:	Re: C. breviceps trilobite Reply #7 - Mar 4^th, 2019 at 8:58am	Print Post
	I'm positive the material is NOT chalcedony, which is silica. If it were, you could have saved yourself a lot of work by simply using HCL to dissolve away the limestone. I'm very sure the material is calcite. I have experimented with similar fossils from Kentucky and using acids to dissolve the limestone will eat into the fossils as well. Try a tiny drop of HCL on an unimportant spot and see if it fizzes, bet it will. Excellent preparation by the way, you could get a job in a museum or research facility as a fossil preparer!


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daves64 Senior Member Offline Rockaholic Posts: 456 Location: Ellensburg WA Joined: Jun 27^th, 2018 Gender:	Re: C. breviceps trilobite Reply #8 - Mar 4^th, 2019 at 2:43pm	Print Post
	No HCL, but white vinegar does start to bubble a bit (being a safer test for calcite). And is there such as thing as an unimportant spot on a fossil? I just found yet another item on my little chunk of pre-history as well. Not sure what it is yet, waiting on an ID. But it's roughly 11 mm long, white & segmented & it looks to be running underneath the bug itself. Hopefully I'll have an answer by this evening when I drag my sorry carcass out of bed.

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daves64 Senior Member Offline Rockaholic Posts: 456 Location: Ellensburg WA Joined: Jun 27^th, 2018 Gender:	Re: C. breviceps trilobite Reply #9 - Mar 4^th, 2019 at 9:56pm	Print Post
	Well, this appears to be part of a crinoid (Sea Lilly) holdfast or root system. Beautiful animals that still exist to this day.


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daves64 Senior Member Offline Rockaholic Posts: 456 Location: Ellensburg WA Joined: Jun 27^th, 2018 Gender:	Re: C. breviceps trilobite Reply #10 - Mar 7^th, 2019 at 12:53pm	Print Post
	I also found a small Bryozoan. With the angle of the pic, it sort of combined with a nice bright chunk of pyrite & a tiny Brachiopod to form a sort of scepter. There's a total of 3 of the brachiopods. My simple little chunk of rock turned out to be rather busy.

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JoeM God Member Offline I Love YaBB 2.5 AE! Posts: 4211 Location: Wake County, NC Joined: Sep 30^th, 2010 Gender:	Re: C. breviceps trilobite Reply #11 - Mar 7^th, 2019 at 8:05pm	Print Post
	That is so cool! All lined up for you! Yeah, that turned out to be a pretty nice chunk of limestone. Well done and thanks for the pictures! I know I've seen pictures of the black and white segmented "stick bug" somewhere before? Haven't had a chance to surf.


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daves64 Senior Member Offline Rockaholic Posts: 456 Location: Ellensburg WA Joined: Jun 27^th, 2018 Gender:	Re: C. breviceps trilobite Reply #12 - Mar 8^th, 2019 at 4:13am	Print Post
	That "stick bug" is the Crinoid holdfast piece. Here's an info link >> https://en.wikipedia.org/wiki/Crinoid & a pic.

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JoeM God Member Offline I Love YaBB 2.5 AE! Posts: 4211 Location: Wake County, NC Joined: Sep 30^th, 2010 Gender:	Re: C. breviceps trilobite Reply #13 - Mar 8^th, 2019 at 12:58pm	Print Post
	But it's got eyes! Well, I knew I had seen something like it before. Thanks for the link. I was under the common misconception that crinoids only grew in more shallow waters.


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daves64 Senior Member Offline Rockaholic Posts: 456 Location: Ellensburg WA Joined: Jun 27^th, 2018 Gender:	Re: C. breviceps trilobite Reply #14 - Mar 8^th, 2019 at 1:40pm	Print Post
	JoeM wrote on Mar 8^th, 2019 at 12:58pm: But it's got eyes! It's got eyes? Where?


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