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Hallopora
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Hallopora elegantula, middle Silurian in age, collected from the Rochester Shale, Lockport, N.Y. Illustration of an early Silurian coral-stromatoporoid community showing various labeled marine organisms, including corals, bryozoans, brachiopods, crinoids, trilobites, and a nautiloid, arranged on and around a block of seafloor substrate with a scale bar indicating centimeters. Silurian Pentamerus community
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Hallopora elegantula, middle Silurian in age, collected from the Rochester Shale, Lockport, N.Y.
Hallopora elegantula, middle Silurian in age, collected from the Rochester Shale, Lockport, N.Y.

Hallopora

fossil bryozoan genus
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History

Hallopora, genus of extinct bryozoans (moss animals) found as fossils in Ordovician to Silurian marine rocks (from 505 to 408 million years old). Hallopora is distinguished by the large size of its pores and by its internal structure. Various species of Hallopora are known, some of them useful for stratigraphic correlation.