Essex Field Club on Facebook

Video about the Club

Evergestis extimalis
find out more... Evergestis extimalis Copyright: Ben Sale

Essex Field Club
Essex Field Club
registered charity
no 1113963
HLF Logo A-Z Page Index

Visit Our Centre

EFC Centre at Wat Tyler Country ParkWe are normally open to the public at our centre at Wat Tyler Country Park every Saturday, Sunday and bank holiday 11am-4pm. We are also open on Wednesdays 10am-4pm.
Summer recording Record Goats-rue Record Wild Carrot
Record Spear Thistle
Record comb-footed spider
Record Wasp Spider
Record Garden Spider Record Nigma walckenaeri spider

Geology Site Account


Ovington Hall Sarsen Stone, OVINGTON, Braintree District, TL763426, Potential Local Geological Site

 
 
hide/show OS map  

Ovington Hall sarsen stone

An exceptional sarsen stone, 2 metres (6'6") long, with a mammillated surface can be seen near the churchyard on the track leading to Ovington Hall.

Sarsens are extremely hard boulders of sandstone formed around 55 million years ago when the climate of Britain was hot and a layer of sand beneath the surface of the ground became cemented with quartz. They are thus very resistant to erosion and have survived the rigours of the Ice Age. They probably originated on the chalk downland of south Cambridgeshire and after retreat of the ice they became concentrated in river valleys such as The Stour.

The remarkable 'mammilated' surfaces are called ‘growth structures’ which were formed as the quartz slowly crystallised between the sand grains.

 

if you have an image please upload it



Geology Site Map
A-Z Geological Site Index