ST1444 : Ammonite on Kilve Beach I

near to East Quantoxhead, Somerset, Great Britain

Ammonite on Kilve Beach I
Ammonite on Kilve Beach I
This is the remains of a fossil ammonite from about 200 million years ago. It is exposed on the shale at the water's edge on Kilve beach. These spiral traces will be gradually eroded away by the sea and the abrasive action of the sand, but as they disappear so hidden ones will be revealed.
(See also ST1444 : Ammonite on Kilve Beach II)
East Quantoxhead GSSP :: ST1344
Thanks to information from Mike Simms LinkExternal link I now know that this bit of coast is the GSSP (Global Boundary Stratotype Section and Point) for the Sinemurian stage of the Early Jurassic epoch. A GSSP is an internationally agreed-upon stratigraphic section as arbitrated by the International Commission on Stratigraphy. In other words this coast at East Quantoxhead is the archetype with which to compare any other cliffs & rock formations for this particular geological period.
The Sinemurian stage commenced 196.5 (+/- 1) million years ago and lasted until 189.6 (+/- 1.5) million years ago. It is therefore very early in the Jurassic period, being the second stage of the 11 that make up the Jurassic. It is sandwiched between the Hettangian and the Pliensbachian stages. This latter stage's GSSP incidentally is at Robin Hood's Bay in Yorkshire (see NZ9505 : Low tide at Robin Hood's Bay).
The Sinemurian's defining marker is the first appearance of the Vermiceras and Metophioceras generas of ammonites. The characteristic spirals of ammonites are to be found in many of the rocks here and just up the coast at Kilve.
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ST1444, 53 images   (more nearby)
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Date Taken
Sunday, 27 August, 2006   (more nearby)
Monday, 19 February, 2007
Rock Feature > Fossils   (more nearby)
Subject Location
OSGB36: geotagged! ST 144 446 [100m precision]
WGS84: 51:11.6511N 3:13.5832W
Photographer Location
OSGB36: geotagged! ST 144 446
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