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Re: Ice Sheets Caused Massive Sea Level Change During Late Cretaceous



Dann  Pigdon Wrote:

>Christopher Collinson wrote:
>>
>> Cool! (pun intended) But if the ice sheets did not extend to the coast, how
>> are the dropstones in the plesiosaur calving grounds of Australia explained?
>>


>These could have been glacial dropstones. Glaciers don't just form in
>polar icesheets - you can find them in many other parts of the world.

>See:

><http://www.cmnh.org/dinoarch/2002Jul/msg00645.html>http://www.cmnh.org/dinoarch/2002Jul/msg00645.html


However glacial dropstones in marine deposits requires that the glaciers reach sea level, otherwise they couldn't calve into the sea. No glaciers do this outside the subarctic (southern Alaska, Iceland) even today.


Tommy Tyrberg