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There's gold in them there nodules!

neuropteris

GPO
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Jun 25, 2004
Messages
141
Hi All

Had another wander along the Holderness coast a couple of weeks ago and found an obvious upper lias nodule eroding out of the boulder clay that makes up the cliffs on that section. Gave it a tap and voila! a rather nice specimen of Dactylioceras tenuicostatum preserved largely in Pyrite. This particular beastie has had a fairly adventurous post death existence having remained buried for 180 million years or so, then being scraped out of the ground by a passing glacier, carried across country for a fair few miles before being buried again for a few more thousand years before finally being uncovered by the sea again - and then just when it was about to return to its ancestral home it gets whacked by a hammer and put on a shelf! It just shows you never know what the world will have in store for you.

Andy
 

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neuropteris

GPO
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Aye, it is a nice one. They are quite often pyritic to some degree but this one was one of the most metallic I've seen. Easy to prep aswell - a few taps with the hammer to show it was there then about 30 minutes with the airpen and a quick clean up using my mates air abrasive. The back of the nodule is covered in Glacial striations aswell.

Andy
 
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Apr 8, 2004
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Fine & dandy Andy !
I've a pair of Cardioceras I'm slowly rebuilding after bouncing down the cliff at Pakefield, Suffolk which have taken a very similar journey to yours & now live in an icecream tub in France awaiting more of my attention.

Keef
 

Architeuthoceras

Architeuthis
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Nov 19, 2002
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"Fools Gold"

I wonder why we dont have many fossils around these parts replaced with Pyrite? All I see is sometimes a clump of square crystals, I think its Goethite (a replacement of the original Pyrite) and usually attached to the fossil, not replacing it. :sad: It sure makes a good lookin fossil. Well at least I dont have to worry about any of my fossils getting that pyrite disease :wink:
 

neuropteris

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Luckily for me the Yorkshire coast pyrite seems pretty stable, no deterioration on any of the finds even after 10 years or so. Theres a lot of pyrite in the beds around there - particularly the Jet Rock which has beds of pyrite skinned nodules which look great when polished up (aswell as having their own range of ammonites within!).

Andy
 

AndyS

Cuttlefish
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Apr 13, 2004
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27
Andy,

Even the Jet rock pyrite nodules eventually start to decay - I have some from about 16 years ago that now start. I would think that polishing even accelerates the decay unless you really seal the surface with some air- and water tight varnish.

AndyS
 

neuropteris

GPO
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Jun 25, 2004
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141
Hi Andy - nice to hear from you again.

So, I've got that to look forward to then. Never mind. This one has had a light coat of matt varnish diluted in white spirit.

Had a look over Robin Hoods Bay again last week which was quite successful. Androgynoceras, Gagaticeras, Amaltheus, Oxynoticeras - I think we'd found examples of 10 genera by the end of the day though few were what I'd call presentable. Found as yet unidentified spiny ammonite in situ in an Obtusum zone nodule. Will post a picture later (its not a great example of whatever it is though).

All the best

Andy
 

neuropteris

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Jun 25, 2004
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Here is the mystery Robin Hoods Bay (lower Lias) ammonite - any suggestions gratefully accepted :smile:

Andy (not S)
 

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