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Dear Martha,
This is a common type of preservation
for crinoids when found in a rock other than limestone (often chert, as this
seems to be). The voids aren’t around
the stems – they are the stems!
The rod in the centre is an infilling of the axial canal of the column (where
all the ligaments etc were in life), and the void is the dissolved skeleton
itself. This type of preservation is actually a lot better for echinoderms than
you might think, in that you can often get very high-resolution casts of the
skeleton; in limestones, it’s often hard to separate the fossil from matrix.
This is probably from one of the cherty
layers in the Carboniferous Limestone.
All the best,
Joe
Find Dr Rock's Lost Gallery - opening
January 28th at Leeds City Museum...
Dr. Joseph P. Botting
Assistant Curator, Natural Sciences
Leeds Museum Dscovery Centre
Carlisle Road
Hunslet
Leeds LS10 1LB
Tel. 0113 2141562
From:
The Geological Curator's Group mailing list
[mailto:[log in to unmask]] On
Behalf Of Lawrence,Martha (Cultural & Community Services)
Sent: 04 May 2010 15:17
To: [log in to unmask]
Subject: Interesting crinoid
Hi,
A member of the public brought an interesting crinoid
specimen in to the museum – photo attached. Can anyone tell me more about it –
why are there voids around the crinoid stems? Is this unusual or just new to
me?
Any comments are very welcome.
Best wishes,
Martha Lawrence
Assistant Museums Manager
Buxton Museum and Art Gallery
Terrace Road, Buxton, Derbyshire, SK17 6DA
01298 24658
www.derbyshire.gov.uk/buxtonmuseum
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