Sentences with phrase «brachiopod species»
A little further in the rock record, a few brachiopod species recover, Wignall says, and then mollusks take over en masse, before the devastation of the Permian extinction, 8 million years later.
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There, Bond and his colleagues examined chert rocks — silica formations, created by the skeletons of dead sponges, that also contain many species of brachiopods.
Most foraminifera — tiny, shelled protozoans — were wiped out, along with many species of clamlike brachiopods.
The evolutionary origin of brachiopods and their relations to other species are still unclear.
Other animals from these ancient marine sediments include a number of exciting new discoveries: arthropods without skeletons, many sponges, a few shelled brachiopods and a single trilobite species.
The Navesink Formation preserves many invertebrate and vertebrate species common in the Late Cretaceous near shore marine sediments, such as bivalves, brachiopods, crustaceans, teleost fish, sharks, turtles and the occasional mosasaur and dinosaur.