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Q.

What are Cambrian animals?

Tags: cambrian animals
Asked by ronit jadhav, 19 Feb '08 04:07 am
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Answers (4)

1.

Most major animal groups appear for the first time in the fossil record some 545 million years ago in a relatively short period of time known as the Cambrian explosion. Of great worry to Darwin, the explanation of this sudden, apparent explosion persists today as a shadowy mystery. While some scientists believe there was indeed an explosion of diversity (the so-called punctuated equilibrium theory elaborated by the late Stephen J Gould - Models In Paleobiology, 1972), others believe that such rapid acceleration of evolution is not possible; they posit that there was an extended period of evolutionary progression of all the animal groups, the evidence for which is lost in scanty fossil record.


The theory of the Cambrian Explosion holds that, beginning some 545 million years ago, an explosion of diversity led to the appearance over a relatively short period of 5 million to 10 million years of a huge number of complex, multi-celled organisms. Moreover, this burst of animal forms led ...more
Answered by suresh babu, 19 Feb '08 06:12 am

 
  
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2.

About 570 million years ago, a number of animals developed shells or outer skeletons. This period of time is known as the Cambrian period. Cambrian animals were all creatures without spines or backbones.
Answered by Anita Fernandes, 19 Feb '08 04:10 am

 
  
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3.

Major animal groups appear for the first time in the fossil record some 545 million years ago in a relatively short period of time known as the Cambrian explosion. Of great worry to Darwin, the explanation of this sudden, apparent explosion persists today as a shadowy mystery. While some scientists believe there was indeed an explosion of diversity (the so-called punctuated equilibrium theory elaborated by the late Stephen J Gould - Models In Paleobiology, 1972), others believe that such rapid acceleration of evolution is not possible; they posit that there was an extended period of evolutionary progression of all the animal groups, the evidence for which is lost in scanty fossil record.

Animals of the Cambrian period

Ediacaran biota
Ordovician animals
Silurian animals
Devonian animals
Carboniferous animals
Permian animals

Answered by sudesh, 19 Feb '08 06:36 am

 
  
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4.

The Cambrian is a major division of the geologic timescale that begins about 542 1.0 Ma (million years ago) at the end of the Proterozoic eon and ended about 488.3 1.7 Ma with the beginning of the Ordovician period (ICS, 2004)[1]. It is the first period of the Paleozoic era of the Phanerozoic eon. The Cambrian takes its name from Cambria, the classical name for Wales, the area where rocks from this time period were first studied.The animals like laggania, Gogia are cambrian animals
Answered by srimathy s, 19 Feb '08 05:42 am

 
  
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