The foundations for the observatory and pier were dug yesterday by the builder and are being filled with concrete today.
The hole for the pier has been dug down to the very stiff clay/gravel of the Summertown-Radley Sand and Gravel Member drift deposit which underlies the garden (about 500mm deep). Speaking from experience this deposit is extremely difficult to dig by hand!! Once filled with concrete this will be a very firm foundation for the telescope pier which will be bolted to it.
