The archaic sponge reef-dwellers of the Cambrian gave way to bryozoans—tiny, group-living animals that built coral-like structures. Ordovician reefs were also home to large sea lilies ...

Some of our area's unique geological features and the processes that occurred to form them are: The fossil content of local limestone shows the diversity of life in the late Ordovician period.

ALPENA COUNTY, Mich. — Have you ever heard of a bryozoan? They're so small, they're easily missed. That is- unless they form a colony, which they often do. Alpena Fish and Wildlife recently came ...

The Museum holds the best collection of fossil bryozoans in the world, with more than 5,000 type and figured specimens. The collection contains an estimated 1,500,000 specimens, making it one of the ...

The Journal of Geology, Vol. 37, No. 7 (Oct. - Nov., 1929), pp. 639-671 (33 pages) The Decorah formation of Ordovician age has been denned as a shale lying above the Platteville limestone and below ...

Bryozoa ("moss animals") - Bryozoa (or "moss animals") are ... Cincinnatian Series - The layer of exposed bedrock in southwestern Ohio composed of rock from the Upper Ordovician period. Clastic ...

The Ordovician world was a watery one in which vast oceans covered almost the entire northern hemisphere. In the south, the mega-continent of Gondwana drifted. According to the University of ...

The Alpena Fish and Wildlife Conservation Office posted on social media this week a picture and report on a bryozoan colony that its crew happened to catch in a net. "Bryozoans are tiny animals ...

Previous reef-builders such as bryozoans were joined by corals and ... over the South Pole but the vast icecaps of the late Ordovician period melted almost to nothing. Sediments formed from ...