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The Devonian period is known as "The Age of Fish", but could also be known as "The Age of Brachiopods." In the Early / Lower Devonian, brachiopods reached the height of their diversity towards its end in the Emsian. We see the ancestral groups occurring, lingulids, craniids, orthids, protorthids, pentamerids, rhynchonellids and strophomenids, as well as the later successful groups we have seen before such as atrypids, athyrids and orthotetids, plus the rise of spiriferids, spiriferinids and productids and the beginning of the terebratulids. By the end of the Devonian , several of these g
BOAR Trepostomatous Bryozoa of the Hamilton Group of New York State By RICHARD S. BOARDMAN GEOLOGICAL SURVEY PROFESSIONAL PAPER 340 about 25 MB HIGHLY RECOMMENDED Among the subjects covered: Stereotoechid wall structure.__.--_---____ 30 Leioclemid wall structure_---_------_-___ 30 Trachytoechid wall structure.------------ 31 Leptotrypellid wall structure _____________ 32 Atactotoechid wall structure__-_-____.___ 32 Zoarial growth and taxonomy. ___________________ 33 Distribution of morphologic characters within Hamilton zoaria.--_--------------_