J. H. Atkinson has raised a number of relevant questions but it is important to note that the main message of our paper was to include specific geology to simplify the characterization of a soil, and the studied soil is a cohesive coarse and non-textbook material so its characterization is difficult because of difficulties in sampling and field testing in current practice. Based upon large-scale direct shear tests, the correlations presented relate particle shapes to friction angle for a specific local geological condition.

In addition, Atkinson has presented eight paragraphs or subjects, which are addressed as follows.

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