Howard, A., Carney, J., Greenwood, M., Keen, D., Mighall, T., O'Brien, C., & Tetlow, E. (2011). The Holme Pierrepont Sand and Gravel and the timing of Middle and Late Devensian floodplain aggradation in the English Midlands. Proceedings of the Geologists' Association, 122(3), 419-431. https://doi.org/10.1016/j.pgeola.2011.03.009