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James D. Owing to the fact that the addition of fresh silica often destro3 r s all traces of the growth-stages of a flint, very little information can be obtained when the process is complete and the nodule a mere solid mass of flint. Fortunately there are innumerable cases to be found in every stage of development, and those who care to look can find them in most districts of the S.E. of England where the Upper Chalk exists. The absence of flint in our lower beds' would of course be explaineddoi:10.1017/s0016756800170566 fatcat:ue7zsoprj5akxccrjzlhyhfvxm