“Cambrian”的概念、定义、翻译、参考文献-科学参考

Cambrian

Biology

The earliest geological period of the Palaeozoic era. It is estimated to have begun about 542 million years ago and lasted for some 56 million years. During this period marine animals with mineralized shells made their first appearance and Cambrian rocks are the first to contain an abundance of fossils. Cambrian fossils are chiefly of marine animals; they include trilobites, which dominated the Cambrian seas, echinoderms, brachiopods, molluscs, and primitive graptolites (from the mid-Cambrian). Trace fossils also provide evidence for a variety of worms. See also cambrian explosion.
http://palaeos.com/paleozoic/cambrian/cambrian.html Illustrated insights into Cambrian stratigraphy and life forms

Geology and Earth Sciences

The first of six periods of the Palaeozoic era, which began about 542 Ma ago and ended about 488.3 Ma ago. Sediments deposited during the period include the first organisms with mineralized skeletons. Common fossils include brachiopods, trilobites, ostracods, and, late in the period, graptolites. Trilobites are important in the stratigraphic subdivision of the period.

Geography

The oldest period of Palaeozoic time, approximately 570–500 million years bp; the time when most of the major groups of animals first appear in the fossil record.
http://www.ucmp.berkeley.edu/cambrian/camb.html Provides an overview of the Cambrian period.

单词	Cambrian
释义	Cambrian Biology The earliest geological period of the Palaeozoic era. It is estimated to have begun about 542 million years ago and lasted for some 56 million years. During this period marine animals with mineralized shells made their first appearance and Cambrian rocks are the first to contain an abundance of fossils. Cambrian fossils are chiefly of marine animals; they include trilobites, which dominated the Cambrian seas, echinoderms, brachiopods, molluscs, and primitive graptolites (from the mid-Cambrian). Trace fossils also provide evidence for a variety of worms. See also cambrian explosion. http://palaeos.com/paleozoic/cambrian/cambrian.html Illustrated insights into Cambrian stratigraphy and life forms Geology and Earth Sciences The first of six periods of the Palaeozoic era, which began about 542 Ma ago and ended about 488.3 Ma ago. Sediments deposited during the period include the first organisms with mineralized skeletons. Common fossils include brachiopods, trilobites, ostracods, and, late in the period, graptolites. Trilobites are important in the stratigraphic subdivision of the period. Geography The oldest period of Palaeozoic time, approximately 570–500 million years bp; the time when most of the major groups of animals first appear in the fossil record. http://www.ucmp.berkeley.edu/cambrian/camb.html Provides an overview of the Cambrian period.
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