The Cambrian Explosion

The Cambrian Explosion - The Cambrian Explosion The...

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The Cambrian Explosion The Cambrian period , the first in the Paleozoic era, spans the time between 544 and 505 million years ago. During what is termed the Cambrian Explosion, living thiungs developed hard structures. The presence of these structures greatly enhanced the chance of an organism becoming a fossil. Prior to the Cambrian, fossils were quite rare and inconspicuous since the organisms were small. This scarcity of the precambrian fossil record is also a consequence of the soft-bodied forms of life needing exceptionally rare circumstances to form fossils. The sudden appearance of relatively complex fossils in the Cambrian was a troubling issue to Charles Darwin. His ideas on evolution included descent with modification and the slow, gradual development of more complex creatures from simpler ones. The lack of a precambrian fossil record was compounded by the wild diversity seen during the Cambrian. Darwin's dilemma would not be solved until the 1960s when scientists got a better handle on the actual diversity of the precambrian
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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The Cambrian Explosion - The Cambrian Explosion The...

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