We have received from Professor E. R. Cumings the following statement, which will be of interest especially to those of our members who are working on coral-reef formations.
A bioherm is “any dome-like, mound-like, lens-like, or otherwise circumscribed mass, built exclusively or mainly by sedentary organisms such as corals, stromatoporoids, algae, brachiopods, molluses, crinoids, et cetera, and enclosed in normal rock of different lithologic character.”1 I would include all true coral and algal reefs under the designation, and all shell beds, crinoid beds, algal banks, et cetera, that have an upstanding form; but not mere layers such as many...
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