Hallopora

Hallopora elegantula, middle Silurian in age, collected from the Rochester Shale, Lockport, N.Y.

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.

Citation Information
Article Title: Hallopora
Website Name: Encyclopaedia Britannica
Publisher: Encyclopaedia Britannica, Inc.
Date Published: 20 July 1998
Access Date: February 22, 2025