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Actinostroma

Actinostroma Actinostroma is a typical calcareous, reef-building, bloblike stromatoporoid. Although enigmatic, the genus is thought by some to be the ancestor of modern sclerosponges. When studied in thin section, it shows a fine structure of thin, concentric layers and radial pillars. Habitat -- This genus commonly lived on, and formed reefs. Remark -- These organisms were important rock formers, particularly in the Silurian and Devonian. Copyright © 1992 Dorling Kindersley Limited, London Text copyright © 1992 Cyril Walker, David Ward .

12cm (4 1/4inch)