tqb
Enthusiastic fossilologist
Posts: 111
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Post by tqb on Feb 18, 2011 11:01:53 GMT -5
Here's an interesting preservation: calcite external casts of Archaeosigillaria from the Ashfell Limestone (Holkerian) of Cumbria. Attachments:
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tqb
Enthusiastic fossilologist
Posts: 111
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Post by tqb on Feb 18, 2011 11:03:11 GMT -5
And a weathered out piece: Attachments:
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Post by Joe Botting on Feb 18, 2011 22:08:44 GMT -5
That is odd! In the Leeds Museum collections there are some odd preservation types as well... cones in siderite nodules replaced by pyrite, the spaces filed with calcite, and then whethered to give a high-res hematite replica of the cone. I've also collected from Allerton Bywater colliery tip some examples of cones with a clear calcite envelope around the entire cone, with a very thin organic surface. I'm not sure how to interpret these except that they look like the cones are actually internal structures of a fruit-like body. If anyone gets a chance to go there, it has some interesting things (rare plants like Sphenasterophyllites), and the staff at the RSPB reserve were very helpful in allowing access. The specimens are all in Leeds Museum, though!
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Post by ammocarbsteve on Feb 19, 2011 5:04:41 GMT -5
Tarquin.... Very nice!... Leeds museum sounds worth a look (if its possible to look in the darwers)...I like seeing and comparing the different preservations...
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Post by paleoflor on Feb 19, 2011 6:51:56 GMT -5
Interesting material! And thank you for the tip on the quarry/museum visit...
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