Geology of the Andover area: Concealed strata - Carboniferous

This page is part of a category of pages providing a summary of the geology of the Andover district (British Geological Survey Sheet 283), which extends over approximately 600 km2 of north-west Hampshire and a small part of eastern Wiltshire. Links to other pages in this category can be found at the foot of the page. Authors: J Thompson, K A Lee, P M Hopson, A R Farrant, A J Newell, R J Marks, L B Bateson, M A Woods, I P Wilkinson and N J Smith.

Limestone of Carboniferous age underlies the main part of the region and forms the basement in the Egbury 1 Borehole mentioned in the Stratal thickness table. The Carboniferous Limestone Supergroup is likely to underlie the main part of the Andover district directly below Triassic and Permian strata overlying the Variscan unconformity or beneath intervening Silesian strata. The limestone in this borehole is found to be white-cream or blue-grey crystalline, fossiliferous, occasionally argillaceous, slightly dolomitic and highly fractured in places.