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1. It dates to the very early Cambrian period, and it also contains only soft - bodied forms.

2. To the beginning of Cambrian period, there are a large number of small shelly animals, this indicates a new phase of development of biological kingdom.

3. The last event marks the beginning of the Cambrian period.

4. During the Cambrian period, 500 million years ago, worm-like creatures were evolving into fish-like creatures.

5. But this is not meant to belittle the magnitude of the adaptive radiations that took place in the Vendian and Cambrian periods.

6. The basement strata and the migmatite, however, were formed much later, about cambrian period and early palaeozoic era.

7. Heand colleagues in Germany and the US studied a database of fossilorganisms that lived on the sea floor from the Cambrian period, about500m years ago.

8. Darwin argued that the question might be answered in future by the discovery of fossils in rocks that formed before the Cambrian period, in Precambrian times.

9. Afterward, global large-scale massive volcanic activity in Permian Period generally brought about metamorphism whole middle Cambrian Period volcanic sediment rock in research area.

10. The area we debated is in infraneritic environment at the Meishucunian Age, early Cambrian Period,[sentencedict.com/cambrian period.html] when deposited a suit of carbonate and phosphate.

11. Sedimentary type deposits usually formed during late Sinian to Cambrian period.

12. For almost a century, geologists studied more and more parts of the world and everywhere the first traces of fossilized creatures continued to crop up at the beginning of the Cambrian period.