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trump
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small shelly fauna小殼生物群是不是最早

2016-11-16 09:39 PM

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Dinosaurprince (Dinosaur Prince)
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回復 #11 trump 的帖子

It is possibly one of the earliest. But as a matter of fact, sometimes we are not sure if some of the small shelly fauna belongs to Ediacaran period or earliest cambrian period because we do not know exactly when did they first appear nor do we know when did animal started mineralize themselves. To say accurately in science, I can only say that the earliest cambrian fossil is trace fossil of Treptichnus pedum because its appearance defined as the beginning of Cambrian period while small shelly fauna may survive to cambrian from Ediacara

2016-12-21 01:47 PM

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Dinosaurprince (Dinosaur Prince)
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Anyway, if anyone interested I have a paper about the cause of cambrian explosion and explain why such a graduate radiation did not earlier than 541mya

2016-12-21 01:50 PM

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fossilshk (Lung)
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QUOTE:

原帖由 Dinosaurprince 於 2016-12-21 01:50 PM 發表
Anyway, if anyone interested I have a paper about the cause of cambrian explosion and explain why such a graduate radiation did not earlier than 541mya

Yes, we are interested it. Please share with us.

2016-12-21 06:21 PM

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dragonfly
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回復 #13 Dinosaurprince 的帖子

論文有沒有中文解釋，如果有更好

2016-12-23 01:25 PM

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寒武紀
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QUOTE:

原帖由 fossilshk 於 2016-12-21 06:21 PM 發表

Yes, we are interested it. Please share with us.

寒武紀:生命的伊甸園

2016-12-27 01:15 AM

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Dinosaurprince (Dinosaur Prince)
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I lost some of my paper when my labtop was broken. But this two papers along with the paper I shared before are the most important one.

A major contribution of Cambrian Radiation is due to oxygen level increase in the ocean during "Snowball Earth" period because of low oxygen consumption in the community, higher oxygen solubility, and ice sheet preventing oceanic oxygen escaping to the atmosphere. As a result, higher oxygen concentration allow higher energy foraging activity such as active predation when the climate was warming right after snowball earth period. Predation also trigger creation of armoue and other animal defense strategy in turns to promote radiation when opportunity available. That is the reason why the first evidence of predation and hard tissue such as armour only appear after cambrian radiation because both predation and building hard structure is energy expensive and it does not make sense to use that amount of energy when organism metabolism was low before cambrian explosion. It is worth to note that not all animal phyla appear at the cambrian radiation. Some phyla may appear earlier such as cnidarian, nematode and possibly mollusk which may date back in ediacaran period or even possibly a billion years ago for nematode. Some phyla may appear after cambrian such as bryozoa (Ordovician) and I remember there was a phylum appear in Jurassic period (I am not quite sure if it is tardigrade, water bear or something else).

[ 本帖最後由 Dinosaurprince 於 2017-1-8 11:42 AM 編輯 ]