East Quantoxhead GSSP :: Shared Description

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.
by Rob Farrow

15 images use this description:

ST1444 : Kilve Beach Rock Formation by Rob Farrow
ST1344 : Quantock's Head cliff by Rob Farrow
ST1344 : Quantock's Head and beach by Rob Farrow
ST1444 : Ammonites on Kilve Beach by Rob Farrow
ST1344 : East Quantoxhead Beach by Stephen McKay
ST1344 : East Quantoxhead Beach by Stephen McKay
ST1444 : Rockface, Kilve Beach by Rob Farrow
ST1444 : Ammonite on Kilve Beach II by Rob Farrow
ST1444 : Kilve Beach by Rob Farrow
ST1344 : East Quantoxhead Beach by Stephen McKay
ST1344 : Banded cliffs and pavements by Rob Farrow
ST1344 : East Quantoxhead Beach by Stephen McKay
ST1444 : Ammonite on Kilve Beach I by Rob Farrow
ST1344 : East Quantoxhead Beach by Stephen McKay
ST1344 : Ammonite imprint by Rob Farrow


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Created: Mon, 6 Sep 2010, Updated: Mon, 6 Sep 2010

The 'Shared Description' text on this page is Copyright 2010 Rob Farrow, however it is specifically licensed so that contributors can reuse it on their own images without restriction.

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