Margett's Pit is the chalk quarry used by the West Kent cement plant, which operated between 1877 and 1925. For details, see
Link and related pages. The pit consisted of Lower Chalk, exposing the Gault Clay at its base, and reaching the Melbourne Rock, which is the base of the Middle Chalk, at its top-most point, visible here. The plant used the chalk from the pit as its sole raw material, blending the high-carbonate material from the upper part with the low-carbonate marl at the base to obtain the desired chemistry.
After a long period of abandonment, it is now being land-filled.