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I have always understood that shedding leaves by trees (and note that
gingkoes do it too!!) is a response to cold weather. whether this is
true or not i am not sure, but if it is, then one would not
expect the leaves to drop in the late K because temperatures even in
places like alaska were too warm. if, however, the dropping leaves
is a response to either low light levels or drier conditions (which
in winter come from having snow rather than rain), then we would
expect leaves to have dropped, but not necessarily in the "autumn"
as defined by astronomical definitions in the case of dryness.
Bonnie A.B. Blackwell, email@example.com
Dept of Geology, off: (718) 997-3332
Queens College, City University of New York, fax: (718) 997-3299
Dept of Earth \& Environmental Sciences, fax: (718) 997-3349
The Graduate Center, CUNY, fax: (718) 997-3513
Flushing, NY 11367-1597 messages: (718) 997-3300