[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Brrr, bone chilling paleopolar summers(Polar dinosaur growth and other new papers)



Now without the truncation demon.

----- Forwarded Message -----

> From: Jura <pristichampsus@yahoo.com>
> To: Dinosaur Mailing List <dinosaur@usc.edu>
> Cc: 
> Sent: Monday, 8 August 2011 12:38 AM
> Subject: Re: Brrr, bone chilling paleopolar summers(Polar dinosaur growth and 
> other new papers)
> 
> ----- Original Message -----
> 
>>  From: Jaime Headden <qi_leong@hotmail.com>
>>  To: Greg Paul <gsp1954@aol.com>; Dinosaur Mailing List 
> <dinosaur@usc.edu>; Jason <pristichampsus@yahoo.com>
>>  Cc: 
>>  Sent: Sunday, 7 August 2011 1:47 AM
>>  Subject: RE: Brrr, bone chilling paleopolar summers(Polar dinosaur growth 
> and other new papers)
>> 
>> 
>>    Before we lose ourselves in the war of "you haven't done 
> [X]" it 
>>  should be noted that no sedimentary regime is _ever_ fully sampled, 
> regardless 
>>  of how long it has been sampled. For example, and this one's just off 
> the 
>>  top of my head, the Morrison and Dinosaur Park Formations have been sampled 
> for 
>>  well over a century and are STILL producing essentially new material 
> providing 
>>  new data on otherwise unknown portions of animals. Some of these are new 
> taxa. 
>>  Some of them MAY be new taxa. Claiming that the North Slope has been so 
>>  well-sampled that it cannot be said to produce new material of otherwise 
> unknown 
>>  bradymetabolic or ectothermal animals is to claim that we know everything 
> about 
>>  it that can be known (like how a pachycephalosaur was only very recently 
> named 
>>  from said sediments, cementing the idea that the formational regime is 
> similar 
>>  enough to that in southern Alberta we could surmise other Campanian 
> Albertan 
>>  clades may be known in it).
>> 
>>    So the statement "misleading misstatement" is neither, and it 
> is 
>>  foolish to say it is.
>> 
> 
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 
> In relation to this I'd like to point out that non-dinosaurian reptile 
> fossils have been found in the North Slope of Alaska (Parrish 1987), but at a 
> lower lev
 Campanian when the average temperature was warmer (assuming 
> one is comfortable calling 10°C "warm"). Yet despite "decades of 
> sieving" the North Slope we still only have one fossil to show for it (a 
> rather crappy mold of a partial turtle shell). This might suggest that -- 
> contra 
> Clemens (1992) -- there might be a taphonomic bias present. 
> 
> Regardless I'd say the North Slope still has plenty of taxa yet to be 
> revealed.
> 
> Jason
> 
> References
> 
> Parrish, J.M., Parrish, J.T., Hutchison, J.H. and Spicer, RA., 1987. Late 
> Cretaceous vertebrate fossils from the North Slope of Alaska and implications 
> for dinosaur ecology. Palaios, v. 2, pp. 377-389
> 
> Clemens, W.A. 1992. Continental Vertebrates from the Late Cretaceous of the 
> North Slope, Alaska. ICAM Proc. 395-398
>