I don't know Ziziphus but google has come up with an image:
http://anthrome.files.wordpress.com/2011/06/img_6882.jpg
Whilst the shape is more elongated than yours Charlotte the outside looks very like. I'm afraid I'm not convinced they are Crataegus - non of my reference of C. monogyna, laevigata/oxycanthoides has such a convoluted outsides although a few get close to the size.
Jacqui
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Jacqui Huntley | Science Advisor North East
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From: The archaeobotany mailing list [[log in to unmask]] On Behalf Of O'BRIEN C.E. [[log in to unmask]]
Sent: 31 January 2014 12:30
To: [log in to unmask]
Subject: Unidentified fruitstone
Thanks for everyone’s suggestions. Dissection definitely seems the way to go. Crataegus was looking very promising from the external point of view, but the internal cavity shape and internal cell structure don’t seem right – also my British Crataegus monogyna fruitstones (far right of photo) are a good bit smaller than my ‘unknown’.
I would be very keen to see your Ziziphus reference material Don – thanks for the offer.
Having dissected the specimen, the cell structure of the wall and internal cavity is very reminiscent of olive (far left of photo) – can you get olive fruitstones in this less elongated shape?
Thanks again,
Charlotte
Charlotte O'Brien BA PhD
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