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
Blisworth centuries iron ore and limestone were quarried at Blisworth. A limestone quarry began in 1821 north east of the canal tunnel and was connected to a canal wharf at the west end of the tunnel by horse-drawn tramway. The tramway ran from the quarry, across the Stoke Bruerne Road and above the west end of the tunnel. Trains of loaded wagons descended by gravity and empty ones were pulled up by a horse. There was a chute for filling the canal boats from the stone wagons .The quarry was closed in 1912 or 1913. A trial iron ore quarry operated