The cambrian period

The Cambrian Period marks an important point in the history of life on earth; it is the epoch when nearly of the major(ip) groups of animals first appear in the fossil record. This resultant role is sometimes called the Cambrian Explosion, because of the relatively short time over which this diversity of forms appears.

A lot can happen in 40 million years, the approximate length of the Cambrian finale. Animals showed outstanding change and diversity during this period of Earths history. When the fossil record is canvas closely, it turns out that the fastest growth in the number of major new animal groups took place during the Tommotian and Atdabanian stages of the Early Cambrian, a period of time which may be in possession of been as short as five million years!

Stratigraphic boundaries are determined by the occurrences of fossils. In fact, much paleontological work is concerned with questions contact when and where stratigraphic boundaries should be defined. At first glance, this may not attend like important work, but consider this. If you exigencyed to be intimate about the evolution of life on Earth, you would absolutely have to keep track of time.

Almost every metazoan phylum with hard parts, and many that inadequacy hard parts, made its first appearance in the Cambrian.



close to of the odd fossils of the Ediacara biota from the Vendian may also have been animals in or near living phyla. However, the Cambrian was nonetheless a time of great evolutionary innovation, with many major groups of organisms look within a span of only forty million years. The animals of the Cambrian were developing new ecological niches and strategies -- such as active hunting, burrowing deeply into sediment, and making complex branching burrows. Finally, the Cambrian saw the appearance of the coralline red algae and the dasyclad green algae.

This...

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