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Author Topic:   Which view makes sense of the fossil record ?
RAZD
Member (Idle past 834 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


(2)
Message 37 of 48 (734793)
08-02-2014 11:09 AM
Reply to: Message 35 by herebedragons
08-02-2014 10:36 AM


Pat, I'd like to solve the puzzle ...

we are limited in our ability to understand
by our ability to understand
RebelAmerican☆Zen☯Deist
... to learn ... to think ... to live ... to laugh ...
to share.


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This message is a reply to:
 Message 35 by herebedragons, posted 08-02-2014 10:36 AM herebedragons has replied

Replies to this message:
 Message 38 by herebedragons, posted 08-02-2014 11:21 AM RAZD has seen this message but not replied

  
RAZD
Member (Idle past 834 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 43 of 48 (734910)
08-03-2014 12:55 PM
Reply to: Message 41 by herebedragons
08-03-2014 8:37 AM


Re: The modern coelacanth is an extreme deepwater marine fish
... I quickly looked for information on ancestral species, and it appears that early coelacanths were not deep water fish. ...
Afaik\iirc all the (current) fossils that are at the 65+ million year end of the "gap" were found in shallow water environments (the issue of access to the fossil beds).
Living fossils like the Coelacanth
quote:
So, where do dry-land rocks come from? Well, some were formed on land, and some in fresh water, and some in shallow sea water. But very few were formed in deep sea water. Plate tectonics makes it clear why this should be. The deep ocean floor is constantly being destroyed, sucked down into the earth at subduction zones. It is unlikely for a piece of deep ocean floor to wind up as a dry-land rock.
For more information on their diversity and specific characteristics see:
Palaeos Vertebrates Sarcopterygii: Overview
Palaeos Vertebrates Sarcopterygii: Actinistia: Hadronector
Palaeos Vertebrates Sarcopterygii : Actinistia
Palaeos: Very Incomplete Sitemap
(palaeos is (or was) a massive linked website on fossils and their divisions\cladograms, but is undergoing a major overhaul and so many links no longer work properly. You can search the site for specifics.)
But I came up blank on habitat of the fossils ... but with their diversity I would not be surprised that they used to inhabit a number of ecologically diverse depth environments.
Enjoy
Edited by RAZD, : clrty

we are limited in our ability to understand
by our ability to understand
RebelAmerican☆Zen☯Deist
... to learn ... to think ... to live ... to laugh ...
to share.


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This message is a reply to:
 Message 41 by herebedragons, posted 08-03-2014 8:37 AM herebedragons has replied

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