English: Brian Funnell recovering core samples at the site of the Ludham Borehole, funded by the Royal Society of London, 1959. Image with kind permission Prof R.G. West. The Ludham Borehole was a geological research borehole drilled in 1959 near Ludham, Norfolk, UK. A continuous core sample of late Pliocene and early Pleistocene sediments of the Crag Group was recovered. Analysis allowed biostratigraphic zonal schemes for fossil pollen,foraminifera, mollusca and dinoflagellates to be constructed for horizons of the Red Crag Formation and Norwich Crag Formations, and for these formations to be thus correlated with strata of equivalent age in the North Sea basin and north-west Europe.