Blisworth Limestone Formation today in the seas off the Bahamas (Kirkaldy p. 59). Much of it also contains marine shells, notably of oyster. Subsequently, the site was submerged less deeply so that the overlying Blisworth Clay was deposited in brackish conditions. (Gallois p. 20) The stratum is known as Blisworth Limestone because it was first studied at Blisworth in Northamptonshire when the Blisworth tunnel was being dug for what is now called the Grand Union Canal. The tunnel finally opened in 1805. Blisworth limestone is a generally thin but widely spread deposit in eastern England. It becomes thicker as one progresses southward from
Dudley Canal remaining route to the tunnel mouth is traceable, and the Lapal Tunnel Trust have carried out some restoration, as they have also done on the section from the eastern portal to the Worcester and Birmingham Canal at Selly Oak. Dudley Canal The Dudley Canal is a canal passing through Dudley in the West Midlands of England. The canal is part of the English and Welsh connected network of navigable inland waterways, and in particular forms part of the popular Stourport Ring narrowboat cruising route. The first short section, which connected to the Stourbridge Canal, opened in 1779, and this was