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BBird

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Reply with quote  #1 
Hi, I found these on Thursday at low tide on Hastings Harbour, anything worth identifying?

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Gandalf the White

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Reply with quote  #2 
Top three look like they have come of a large rock which has had sea snails or bivalves burrows on it.

The next three picture are either a pretty rock or part of an ammonite because the pattern reminds me of the side of some ammonites as shown in this picture bellow of a chamber of an ammonite.

For the next specimen it just looks like a long piece of banded flint.

The final black rock looks like pumice from volcanic reactions, it should be lighter than most rocks that size.

Hope I helped.

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prep01

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Reply with quote  #3 
Hello BBird, 1 - 3 are rocks recently bored by a colony of bivalves (?Piddock); 4 - 6 is the partial outer whorl of an ammonite, very worn showing the sutures (suggest you search to find out more); 7 - 10 banded flint and 11 - 13 probably industrial man made substance.
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Colin Huller
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Gandalf the White

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Reply with quote  #4 
Do ammonites like, Dactylioceras athleticum (first picture) have segment in them which create a geode in them like, Desmoceras Ammonite (in the second picture) or is it just a plain rock spiral?

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Rolo

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Reply with quote  #5 
I very much doubt 4-6 is part of an ammonite. The Hastings beds are a non-marine formation. Although chalk material including flint is washed in from the west, and 4-6 looks like a flint pebble, flint does not generally preserve ammonites.
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prep01

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Reply with quote  #6 
Hi BBird, I've now had a closer look at 4 - 6 and think it is a flint nodule. Rolo is quite correct in that flint is not found in the early Cretaceous, so it will have been eroded from chalk cliffs and moved, by whatever means - natural or man.
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Colin Huller
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prep01

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Reply with quote  #7 
Gandalf The White - it will depend on how it was formed - not the genus. Below are a couple of links but for more in depth papers / articles I suggest you search 'fossil diagenesis'.

https://ukfossils.co.uk/2016/01/28/how-fossils-formed/



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Colin Huller
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Gandalf the White

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Reply with quote  #8 
So if I had a ammonite in pyrite, (which I do have, same size and same species) would that be enough to create a nice pattern or not? Or do I just need to try it out? Anyway here is the ammonite in pyrite.

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prep01

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Reply with quote  #9 
IMHO, it's 'pot lu!ck' However I would ask someone like Byron Blessed in Whitby as I think the pyritised ammos are far less likely to be crystalised.
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Colin Huller
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Gandalf the White

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Reply with quote  #10 
I am going on the two Yorkshire fossil events so I will try and see him then.
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