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Hi Nigel,

Does the slab look like it's been lifted from a quarry or from among foreshore rubble? Air-weathered and/or slightly water-worn? As you know it's so difficult to be confident from photos alone, but it does remind me a little of pre-Planorbis slabs I've seen from the intertidal at Aust and other locs along the N Somerset coast. 

Guess you've checked out 

  2. Binney E. W.
 1859. Notice of Lias Deposits at Quarry-Gill and other places near Carlisle. Quarterly Journal of the Geological Society of London 15,549–551.

There's also a review of the subsurface Carlisle succession by Hugh Ivimey-Cook et al., PYGS 1995. Some of the references therein might be useful?

Hope this helps,

Jon

Jon Radley

Curator of Natural Sciences

Heritage & Culture Warwickshire (HCW)

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On 27 June 2017 at 20:53, Nigel Larkin <[log in to unmask]> wrote:

Dear colleagues,

Enclosed are three photographs of a small partial ichthyosaur skeleton that is
in the collection of the Tullie House Museum in Carlisle. In the mid-1970s it
was found in the soil of a garden near Carlisle – so obviously it could be
from anywhere.

If it is local it would be a very early specimen, potentially from the Upper
Triassic. Yet its preservation and host matrix is not familiar to anyone who
has seen it. Whilst there are clearly some macro invertebrates preserved in
the matrix, they have proved impossible to identify due to poor preservation.
Similarly, samples of the matrix have been analysed for microfossils but none
are preserved so the specimen cannot be dated that way.

Do you recognize the matrix or the preservation of the fossil? Do you know
where it might be from? If so, please get in touch off-list. Any thoughts are
welcome.

Thank you for your help. With best wishes, Nigel.



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