Recently I have read a number of articles in which the word “bioclastic,” as applied to limestones, was used incorrectly. The further misuse of this term in the September, October, and December numbers of the Bulletin prompts the writing of this note (Hose and Repenning, September, 1959; Andrichuk, October, 1959; Sando et al., December, 1959).

The term “bioclastic” was used by Grabau (1904) in his ingenious and fascinating classification of sedimentary rocks. In dealing with the clastic rocks his categories were based on the agents which caused the fragmentation; thus, hydroclastic (water-broken), pyroclastic (fire-broken), and so on. His bioclastic...

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