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144 Views 9 Replies Last post: May 17, 2018 11:24 AM by Paul RSS
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May 16, 2018 2:42 PM

Is this a shark crushing tooth?

Please can you help identify this object found in a module,Marylandersea,Essex. The object is smooth with no visible surface markings even under magnification. It is however quite regular with flat ends and a concave surface. I was wondering if it could be a crushing tooth from a shark or Ray. The object is of different material to the matrix as shown in the photos.

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    May 16, 2018 5:14 PM (in response to Paul)
    Re: Is this a shark crushing tooth?

    Hello Paul, I don't see a fossil I'm afraid, so I will leave it to Dr T and others to suggest what it might be. However I'm sure he wiill want to know if it came out of the shown matrix and if so, what the matrix is? Also, can you scratch it with a steel object?

    Regards

    Colin

    (A shot in the dark - it's flint)

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        May 16, 2018 6:50 PM (in response to Paul)
        Re: Is this a shark crushing tooth?

        Hi Paul, the 'bedrock' in that area mainly London clay (48 - 56 myo) with some earlier Thames group deposits, but this more looks like an early chalk nodule and if it were Totternhoe stone it would include all sorts of small stones. But how it got there?????

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    May 16, 2018 9:38 PM (in response to Paul)
    Re: Is this a shark crushing tooth?

    Hi - my first reaction was artefact.  Do you mean convex when you say concave? - I am a bit confused by your description. ("module"?). 

     

    Can you scratch it with something steel? (e.g. screwdriver). 

     

    I can see why you say the "matrix looks like an oolite" but why do you say "it can't be"?  It looks suspiciously man-made.  This is a good example of needing to have the specimen in one's hand. 

     

    Can you take a photo of the matrix wetted, in overcast natural daylight - no flash - thx

     

    Capture.JPG

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    May 17, 2018 10:26 AM (in response to Paul)
    Re: Is this a shark crushing tooth?

    Thanks Paul

    You may well be correct with tooth but I still find this suspicious - the matrix doesn't look like any oolite I am familiar with and this snip looks like man-made material - but I don't have it in my hand to examine properly.

    Capture.JPG

    • When you scratch the dark object, what colour is the powder? 
    • Does it behave as a magnet itself? (does it move a greased needle floating on water, or a compass needle)
    • Does it react to a magnet? 

     

    When you have checked this, then I will seek internal NHM advice - thanks!

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    May 17, 2018 12:14 PM (in response to Paul)
    Re: Is this a shark crushing tooth?

    That's a more convincing location - Coralline Crag is full of a variety of interesting things.  It may well be fish or reptile.  I have requested internal NHM assistance.

     

    https://ukfossils.co.uk/2005/01/24/ramsholt/

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