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Pre-Cambrian Nuneaton EarthCache

Hidden : 3/13/2008
Difficulty:
3.5 out of 5
Terrain:
1.5 out of 5

Size: Size:   not chosen (not chosen)

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Geocache Description:

This earthcache is located between Nuneaton and Atherstone on a narrow Pre-Cambrian Volcanic ridge. These are very old rocks indeed and date from 600Ma-500Ma.



The Pre-Cambrian ridge is shown in purple.

At this point you are 524 feet above sea level right on what was the rim of the volcano that Nuneaton is built on the side of. The path in is a good, hard path that should be mostly pushchair and wheel chair friendly and can be approached from the North-West where the walk is around 0.2 mile or from the South-East where parking may be a little easier but the walk is about 0.5 mile.

A great chain of very deep quarries exploiting the precambrian and palaeozoic shales, quartzites and volcanic rocks exists within the Atherstone Ridge between Baddesley Ensor and Nuneaton. It includes quarries such as Purley (a Cambrian Outwoods Shale Formation site in a state of active exposure), Oldbury (which your overlook at this site – a site of Ordovician sill in Upper Cambrian Outwood shales in a state of active exposure), Boons, Jees Woodlands (a site of Cambrian Hartshill Sandstone Formation Purley Shale Formation in a state of active exposure), Midland (a site of Cambrian Hartshill Formation Ordovician diorite sill Trias Bromsgrove sandstone Formation in a state of disused exposure) and Judkins (a site of Pre-Cambrian Volcaniclastics Trias basal Mercia Mudstone Group in a state of disused exposure).

Griff Quarry and Dosthill Brickpit resemble the above but are located a few miles from the ridge. Ensors Pool in Nuneaton is a particularly large and wildlife rich site which is designated and SSSI and LNR. Most are either still being worked or are subject to landfill operations or development proposals. They mostly lack calcareous soils and tend to produce neutral to acid grassland, progressing to gorse, broom and other types of scrub, then to birch-oak secondary woodland with bracken where allowed. Some support valuable habitat mosaics of county value, and occasionally patches of heathland (a scarce habitat in our area), though they fail to attain the quality of the best limestone ones, and generally lack high quality wetlands. Other small sandstone quarries historically exploited for building stone can be found in the northern half of the county, but have mostly become wooded over.

To log this cache, visit the site and take a photograph of yourself or your gps at the site with the volcanic crater in the background and answer the following questions;

Which hard, volcanic rock has been quarried commercially near Nuneaton?

Estimate to the nearest 5 miles the circumference of the volcano rim - this information is not 'googleable', you will need to use an OS map

Although not a logging requirement I would like to build up a panoramic picture looking across the volcano. If anyone would like to take a picture without themselves or the gps and post it with the co-ordinates it was taken from I will try to stitch the pictures together and post the results on the web page.

Additional Hints (No hints available.)