I know that after the Cambrian explosion there was a mass extiniction. I was wondering "specifically" what life forms survived. 
thanks 
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Question, what life forms survived?
- Thread starter Oncedeceived
- Start date
lucaspa
Legend
Oncedeceived said:
I haven't seen evidence of a mass extinction following the Cambrian. There appears to be a mass extinction just BEFORE the Cambrian "explosion", which helps explain the "explosion". It was an adaptive radiation into all those newly emptied ecological niches, plus the newly opened niche of having hard body parts.
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lucaspa said:
There were four mass extinctions occurring during the Cambrian and four I believe after. A better question may be: What life forms survived through each mass extinction?
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MartinM said:[Hovind]The best scientific evidence suggests they may have looked like this[/Hovind]
lol YA-BA-DABA-DO
This creates a serious flaw with your stance.....humans and dino's together. Here is......ah proof? heheheh
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the_malevolent_milk_man
Well-Known Member
I assume you're talking about the Permian extinction in which roughly 95% of all known organisms became extinct?
We can't say for 100% but I know of three basic theories.
1- There is evidence for alot of volcanic activity in this era. This could have had an effect on earths climate by spewing ash into the air which partially blocks the sun and drastically effects temperature.
2- There is also evidence of heavy glaciation. This would lower the planets temperature and lower sea levels.
3- Pangea had formed by the late permian which destroyed alot of the shallow seas which is where the majority of life was located.
So by the late Permian habitat had been lost, there were wild fluctuations in temperature, volcanos were going nuts, and the world was getting colder. Pretty much the end of the world from those organisms points of view. Throw in a large meteor which hits every few 100,000 years and you've got some serious problems.
We can't say for 100% but I know of three basic theories.
1- There is evidence for alot of volcanic activity in this era. This could have had an effect on earths climate by spewing ash into the air which partially blocks the sun and drastically effects temperature.
2- There is also evidence of heavy glaciation. This would lower the planets temperature and lower sea levels.
3- Pangea had formed by the late permian which destroyed alot of the shallow seas which is where the majority of life was located.
So by the late Permian habitat had been lost, there were wild fluctuations in temperature, volcanos were going nuts, and the world was getting colder. Pretty much the end of the world from those organisms points of view. Throw in a large meteor which hits every few 100,000 years and you've got some serious problems.
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JohnR7 said:
Wow, that would be one serious infestation.
Seriously though, no one has named the life forms that survived.
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lucaspa
Legend
Oncedeceived said:
Can you post sources?
I see "4 extinctions in the Cambrian" at http://hannover.park.org/Canada/Museum/extinction/cammass.html, but that also lists the "survivors", so if you used that website you have your answer. However, the site offers no details.
All other sources list ONE extinction at the end of the Cambrian-beginning of Ordovician
Do Google search on "Cambrian mass extinction"
The site http://www.bbc.co.uk/education/darwin/exfiles/cambrian.htm has the extinction happening at the END of the Cambrian, not during the Cambrian explosion.
"the best evidence is for those animals which had some hard or shelly parts - and it is clear that the brachiopods and the conodonts suffered considerable losses in diversity. the trilobites too suffered heavy losses, and would never again be so diverse or dominant. "
The groups didn't disappear, but some families within the orders went extinct.
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lucaspa
Legend
A list of all extinction events with sketches of the groups who made it thru is here:
http://www.bbc.co.uk/education/darwin/exfiles/massintro.htm
http://www.bbc.co.uk/education/darwin/exfiles/massintro.htm
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lucaspa said:A list of all extinction events with sketches of the groups who made it thru is here:
http://www.bbc.co.uk/education/darwin/exfiles/massintro.htm[/QUOTE]
Thanks lucaspa, I really appreciate the time you took to look this up. I really did put a search up in google but didn't find this.
Now I need to digest all this and then ifriit will see where I might be going with all this.
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