Compound Coral
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A characteristic a-separate compound coral. The columns are prismatic and their walls pierced by regular pores. Internally the tubes are divided by horizontal plates or tabulae. This is an important limestone builder in the Palaeozoic.
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Corals and Sea AnemoneSource
Amadeus W. Grabau A Textbook of Geology (Boston: D.C. Heath & Co., 1920) 288
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