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Post by Joe Botting on Mar 21, 2012 1:19:13 GMT -5
What can I say? Luanne knows her stuff. ;D
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Post by pleecan (Peter Lee) on Nov 24, 2012 16:37:45 GMT -5
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Post by ammocarbsteve on Nov 27, 2012 3:42:14 GMT -5
Peter.... Fabulous images!... Your getting a ' dab hand ' with that camera...
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Post by pleecan (Peter Lee) on Nov 27, 2012 11:36:18 GMT -5
Thanks Steve.... one can better manual focus on 20" screen vs 3" screen.
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Post by tombuckley on Dec 2, 2012 8:21:24 GMT -5
I think it may be a trace fossil. Take a look at the medusoid Dactyloidites asteroides in Bruce Stinchcomb's book Paleozoic Fossils or Dactyloidites in Trace Fossil Analysis by Adolf Seilacher.
Tom
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Post by pleecan (Peter Lee) on Dec 2, 2012 13:24:32 GMT -5
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Post by pleecan (Peter Lee) on Dec 2, 2012 13:28:21 GMT -5
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Post by Joe Botting on Dec 3, 2012 1:50:16 GMT -5
Oh, well done Tom - I think you might be onto something there. The structure does look pretty good for radial burrows, pyritised. I wasn't familiar with this one - thanks.
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Post by tombuckley on Dec 3, 2012 9:51:02 GMT -5
Thank you Joe. I've always been fascinated with trace fossils. I'm also a fanatic when it comes to recognizing even the smallest detail of a specimen. I reason that if I went through the trouble of dragging a hunk of rock home, it deserves a good going-over before it's thrown on the discard pile. Just the other day I was examining a rather ordinary lump of shale which I had picked up because of its rounded shape. Well, after some mild abrasive blasting a silicified crinoid calyx began to emerge. By the way....how do I tag a thread so that I will be notified when a post is made? The HELP section said to "click on a box" but I can't locate the box. Also....the only way to add images is to put the exact address in the code? Is there a "browse" option? Thanks. Tom
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Post by Joe Botting on Dec 3, 2012 20:21:02 GMT -5
I like your approach, Tom - and a silicified calyx sounds like a mighty good reward, to me. For the first part of your query, you have to first bookmark the thread (above thread title). Then go to your profile page, where there is now a bookmarks tab. In there, click the manage bookmarks button, above right of the listing, and hey presto. I'm afraid the image addition is a bit fiddly - really the only satisfactory way of doing it is to use an image placed on the web elsewhere, and pasting in the link code. It's a very basic forum, this - one day, if we ever find the time, we will probably try to update it to one with its own image space...
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Post by pleecan (Peter Lee) on Dec 4, 2012 6:07:32 GMT -5
Can Dactyloidites asteroides burrow be 2x3 mm in size? Find it hard to believe it is a burrow the structures are way too fine... just my gut feel....
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Post by Joe Botting on Dec 4, 2012 7:57:43 GMT -5
Depends what made it, Peter. We're certainly not talking about the same species; it may not even be the same group of organisms, but simply a pattern of burrowing shared by two or more beasties (ichnotaxonomy is by definition a form taxonomy rather than a biological one). There are certainly some very small worms, even excluding nematodes (which have a different movement style). I think this is much more likely than it being a body fossil, personally... although I'm still not ruling out dendrites.
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Post by pleecan (Peter Lee) on Dec 4, 2012 19:38:18 GMT -5
Thanks for that perspective Joe!
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