| 翻訳と辞書 |
| Animals of Devonian Michigan ： ウィキペディア英語版 |
Animals of Devonian Michigan
Fossils of many types of water-dwelling animals from the Devonian period are found in deposits in the U.S. state of Michigan. Among the more commonly occurring specimens are bryozoans, corals, crinoids, and brachiopods. Also found, but not so commonly, are armored fish called placoderms, snails, sharks, stromatolites, trilobites and blastoids.
==Bryozoans==
Bryozoans (moss animals) are a type of marine fossil commonly found in Michigan. They are often found in conjunction with corals, crinoids, and brachiopods, being extremely common in many places. Bryozoans vary in size greatly, from a few millimetres to several feet tall. In life they were filter feeders and competed with corals and crinoids for feeding space. Bryozoans came in three types: branching, encrusting, and fan-like bryozoans, and all are found in Michigan. By far the most common of these three types were branching bryozoans, which can be found by the hundreds at almost any Devonian marine site. These types are named for their slender, branch like shape and how they grow together in small forest-like groups. Encrusting bryozoans are also very common animals and are often found with brachiopods. Encrusting bryozoans get their name because they live on the shells and calcite skeletons of dead sea animals. When they attached themselves to the dead animals they would form a mat-like colony on the said animal. Then they would filter feed from the animals position in the water. Fan-like Bryozoans are the least common of the bryozoan types found in Michigan. They are found most often in association with crinoids and are common components of hash fossils. They are named for the broad, fan-like shape. They grew in abundance in reefs.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Animals of Devonian Michigan」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|