Nematomorpha Fossil*Maotianshania*Chengjiang biota* (08/05/2009)

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Nematomorpha Fossil*Maotianshania*Chengjiang biota*

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Nematomorpha FossilMaotianshaniaChengjiang biota*

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Sold Date: 08/05/2009
Channel: Online Auction
Source: eBay
Category: Natural History

C hengjiang biota E arly Cambrian(~525 million years ago)
F ossil Site: Chengjiang Maotianshan Shales - Quiongzhusi Section, Yu’anshan Member, Heilinpu Formation, Maotianshan,China

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Airmail 0-50 $6.98 51-100 $7.98 101-150 11 151-200 14 201-250 16 251-300 18 301-350 20 351-400 2 2 401-450 2 4 451-500 2 6 501-600 2 8 601-700 30 7 01-800 3 2 801-900 3 4 3 6 over 1000 $6 for every additional 100g

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ABOUT CHENGJIANG FAUNA FOSSIL
The first unequivocal evidence of multicellular organisms in the fossil record comes from the Ediacaran faunas, named for the Ediacara Hills of Australia w they were first discovered. The earliest of these come from the Vendian period of the Proterozoic, some 565 million years ago. These were soft-bodied organisms, some of which had a "quilted" appearance, which are entirely preserved as impression or compression fossils.
The Cambrian fossils of Chengjiang in Yunnan Province, China (~525 million years ago), and the somewhat younger Burgess Shale Fauna of Field, British Columbia (~515 million years ago) afford a magnificent diversity of organisms that represent all the major phyla in existence today, and some organisms that are as yet of enigmatic origin. This rapid change, in a mere blink of an eye in geological terms, is what is called the "Cambrian Explosion". One postulated reason for this change is the fact that the rising concentration of oxygen, a result of bacterial and plant photosynthesis over the eons, allowed for organisms to be larger in size and lead a more active lifestyle. Larger organisms more easily leave traces in the fossil record. This same time period saw the evolution of hard body parts, thought to be a consequence of the selection pressures brought about by predation. Other mechanisms are theorized to have contributed to the Cambrian explosion, such as a cooling of the Earth and an increase in calcium in marine environments. While the Cambrian Explosion may always be shrouded in some mystery, it is clear that it represents a profound period of life on Earth, w the basic body plans of the major animal phyla were establ...