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Dinosaurprince2016-10-3 06:04 AM
寒武紀大爆發與前寒武紀Mistaken Point 生物群問題 你問我答

大家好!之前我上了關於寒武紀大爆發的課,我而家幫手嘅lab都同寒武紀大爆發有關。我幚手個教授之前都幫nasa研究Mistaken Point 生物群。所以如果大家有興趣可以問我問題,我都可以post D paper 比大家。 只不過我而家考緊 graduate program,可能會比較忙,有機會遲左回答,請大家見諒。

Dinosaurprince2016-10-3 06:09 AM
Here is some of the paper for Cambrian explosion

c72016-10-3 06:29 AM
Hi Dinosaur Prince,
nasa有研究化石的?

Dinosaurprince2016-10-3 08:14 AM
回復 #3 c7 的帖子

有呀
NASA 有個太空生物學program,佢地希望透過研究地球原始生命既進化去估計地球以外既生物係點樣。而mistaken point之所以重要係因為同地球而家或者以前所有生物唔同所以nasa 希望可以有多少少資料去預計外星生命會係點樣

trump2016-10-4 03:20 AM
想問最早的寒武紀化石地層在那裡找到

fossilshk2016-10-5 09:13 PM
[quote]原帖由 [i]Dinosaurprince[/i] 於 2016-10-3 02:04 PM 發表
大家好!之前我上了關於寒武紀大爆發的課,我而家幫手嘅lab都同寒武紀大爆發有關。我幚手個教授之前都幫nasa研究Mistaken Point 生物群。所以如果大� ... [/quote]

很高興見到你們當中很多個都向自己的理想進發, Dinosaurprince, Fion Ma, Franco 仔等等:victory:, 要繼續加油, 帶多點知識給我們會員分享:handshake

rock-tw2016-10-23 02:09 PM
小男孩現在變成專家了:victory:
我一樣想知道最早的寒武紀化石地層,及全世界的寒武紀化石地層

Dinosaurprince2016-10-28 12:27 AM
回復 #5 trump 的帖子

Sorry I had three midterms in last two week and actually I have another midterm about fish and amphibian evolution tomorrow.
The lowest Cambrian can be defined by certain trace fossil found in Spain, Newfoundland in Canada, part of western US and Namibia. However, what evolutionary biologist interested is the Cambrian explosion strata and the earliest one is in Chengjiang biota in China and then the Burgress in Canada.

Dinosaurprince2016-10-28 12:36 AM
回復 #7 rock-tw 的帖子

actually you could search the strata with geologic map
I think this is one of the map you can find for free: [url]https://www.unavco.org/software/visualization/idv/IDV_datasource_OneGeology.html[/url]

寒武紀2016-10-31 11:42 PM
[quote]原帖由 [i]Dinosaurprince[/i] 於 2016-10-28 08:36 AM 發表
actually you could search the strata with geologic map
I think this is one of the map you can find for free: [url]https://www.unavco.org/software/visualization/idv/IDV_datasource_OneGeology.html[/url] [/quote]

:handshake

trump2016-11-16 01:39 PM
small shelly fauna小殼生物群是不是最早

Dinosaurprince2016-12-21 05:47 AM
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

Dinosaurprince2016-12-21 05:50 AM
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

fossilshk2016-12-21 10:21 AM
[quote]原帖由 [i]Dinosaurprince[/i] 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 [/quote]

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

dragonfly2016-12-23 05:25 AM
回復 #13 Dinosaurprince 的帖子

論文有沒有中文解釋,如果有更好

寒武紀2016-12-26 05:15 PM
[quote]原帖由 [i]fossilshk[/i] 於 2016-12-21 06:21 PM 發表


Yes, we  are interested it. Please share with us. :) [/quote]

x2 :)

Dinosaurprince2017-1-8 03:39 AM
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).

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

Dinosaurprince2017-1-8 03:43 AM
回復 #15 dragonfly 的帖子

When you know that 90%+ of academic paper is written in English, you know you better improve your English :D

dragonfly2017-1-10 07:59 AM
Ok, I will try to read..

好黃魚呀2017-1-11 10:33 AM
Mistaken Point 是什麼意思


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