Brachiopod fossil dating
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A brachiopod comprises a hinged shell and a stalk with which it grips the rocks. The cross-section B shows; lophophore 1 which bears ciliated tentacles used for feeding, digestive gland 2 , mouth 3 , and stalks 4. When feeding Lingula , C , which resembles fossil forms of million years ago rests on the surface of its burrow using feathery cilia to filter water for food particles, When disturbed, its stalk contracts, drawing the animal into the burrow D. A brachiopod is any of several hundred species of small, bottom-dwelling, marine invertebrates of the phylum Brachiopoda.
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Brachiopod Fossil (U.S. National Park Service)
Click to see full answer. In this way, what period did brachiopods live in? Brachiopods have an extensive fossil record, first appearing in rocks dating back to the early part of the Cambrian Period, about million years ago. They were extremely abundant during the Paleozoic Era , reaching their highest diversity roughly million years ago, during the Devonian Period. Similarly, how do brachiopods live? Lingula lives in mud or sand and is attached at the bottom of its burrow.
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A Who's Who of Devonian Invertebrates
Rebuilding a lost record of the Earth takes a process much like fitting puzzle pieces together, and one of those pieces is determining the age of things. Monica Carroll, a master's student in geological sciences at Virginia Tech, and colleagues at Virginia Tech and other universities have fit one more piece into the puzzle. They have expanded the dating of marine animals beyond mollusks to brachiopods, and the method has been shown to work back to the time of Aristotle. Goodfriend of George Washington University, have provided the first quantitative estimates of time averaging for present-day brachiopods.
Brachiopod valves are hinged at the rear end, while the front can be opened for feeding or closed for protection. Two major groups are recognized, articulate and inarticulate. The word "articulate" is used to describe the tooth-and-groove features of the valve-hinge which is present in the articulate group, and absent from the inarticulate group.