Published online by Cambridge University Press: 14 March 2018
An X-ray study of the chamosite occurring in the ironstone beds near Easton Neston, Northamptonshire, has shown that probably the whole of the worked ironstone at this point is part of the Main Oolitic Ironstone Group of the Northampton Sand Ironstone formation. The boundary between the Main Ironstone in this area and the Chamosite-Kaolinite beds which overlie it has hitherto not been clearly identifiable, but it is now certain that the boundary is not more than 2 ft. 6 ins. below the top of the worked ironstone.