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Thread: Crystalized fossils in rock

  1. #1 Crystalized fossils in rock 
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    Me and my brother came across some rocks with crystallized fossils, and wanted to know if they're anything special, we're both skeptical about them being worth anything because we found multiple rocks with them, and the number of fossils in them is a phenominal amount, I've also posted some pictures (if they're working, if not I'm leaving the url of the pictures)to help, thanks in advance for the help.


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    http://img.photobucket.com/albums/v7...sils/00001.jpg
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    http://img.photobucket.com/albums/v7...sils/00002.jpg
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    http://img.photobucket.com/albums/v7...sils/00003.jpg
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    http://img.photobucket.com/albums/v738/ForsakenSoul422/Crystalizes%20fossils/00004.jpg[/img]


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  3. #2  
    WYSIWYG Moderator marnixR's Avatar
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    looks like ammonites or nautiloids - possibly worth some of money (not huge riches, mind) provided they've mostly been extracted from the matrix

    for a second opinion, you could also ask the Fossil Forum, it's more their line of enquiry


    "Reality is that which, when you stop believing in it, doesn't go away." (Philip K. Dick)
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  4. #3  
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    The crystalised parts are most likely old cavities that have been filled with a mineral such as calcite or quartz. The cavities might well be chambers in a shell of some sort. The curly shape in the first photo makes me agree with marnixR- they might be ammonites or nautiloids. A good specimen can be worth a few quid in a fossil shop, but looking at that rock, I doubt very much you'd be able to chisel any out of there in tact.
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  5. #4  
    Universal Mind John Galt's Avatar
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    From a monetary point of view worth next to nothing - unless one of the specimens is of a very rare type. In addition this looks like a very dense micr-crytaline limestone and so extremely difficult to remove the fossils.

    You have taken good photographs, but the character of the rock itself makes identification extremely difficult. However, I like making wild guesses: I think this may be Middle Jurassic. May I ask approximately where you collected this?
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  6. #5  
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    Quote Originally Posted by Ophiolite
    From a monetary point of view worth next to nothing - unless one of the specimens is of a very rare type. In addition this looks like a very dense micr-crytaline limestone and so extremely difficult to remove the fossils.

    You have taken good photographs, but the character of the rock itself makes identification extremely difficult. However, I like making wild guesses: I think this may be Middle Jurassic. May I ask approximately where you collected this?
    Me and my brother located them at Charlevoix, Michigan (Town near the Mackinac bridge) if that helps any.
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  7. #6  
    Universal Mind John Galt's Avatar
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    I was hoping it might have been in the UK and therefore somewhere I was familiar with. I'll see what I can find out for you.

    Edit: Right. I found the town on Google maps and matched it up with these geology maps of Michigan from here: http://www.deq.state.mi.us/documents...l-GTLH_geo.pdf

    I was quite mistaken. These are Devonian not Jurassic, so quite a bit older. You will see the link mentions Charlevoix as one of the places where the Devonian outcrops and (matching your comments on their being lots of fossils) says the Devonian rocks are the most fossilferous in Michigan.
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  8. #7  
    New Member prettyrock's Avatar
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    Where you all rock hunting or did you just happen upon them? Great find!
    Love rocks and gemstones!
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