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 ore quarries were opened to the west of the village in about 1873,operating to the north of the Gayton Road until 1895 and south of the road from 1895 to about 1913. Horse Tramways connected these quarries eastwards to the canal and westwards to the railway. A new quarry operated to the south of these in 1942 and 1943 and between 1954 and 1967. This was the only iron quarry at Blisworth to use mechanical diggers. They were electric and diesel powered. The quarry was connected by standard gauge steam operated tramway to sidings on the railway at Gayton south