Glacigenic diamictons : a rationale for study -- A brief history of till research and developing nomenclature -- Till : when is it an inappropriate term? -- Glacigenic diamictons : a strategy for field description and analysis -- Subglacial sedimentary processes : origins of till matrix and terminal grade -- Subglacial sedimentary processes : modern observations on till evolution -- Subglacial sedimentary processes : laboratory and modelling experiments on till -- Evolution -- Measuring strain signatures in glacial deposits -- The geological record : products of lodgement, cavity fill and the boulder -- Pavement problem -- The geological record : deforming bed deposits -- The geological record : sliding bed deposits -- The geological record : impacts of pressurisedwater (clastic dykes) -- The geological record : melt-out till -- The geological record : glacitectonite -- Glacial diamictons unrelated to subglacial processes -- Till spatial mosaics, temporal variability and architecture -- Concluding remarks : the case for a simplified nomenclature.