| | |
Summary: A postglacial palaeoecological record from
the San Juan Mountains of Colorado USA:
fire, climate and vegetation history
Jaime L. Toney1* and R. Scott Anderson1,2,3
(
1
Laboratory of Paleoecology, Bilby Research Center, Box 6013, Northern Arizona
University, Flagstaff AZ 86011, USA; 2
Quaternary Sciences Program, Box 5644,
Northern Arizona University, Flagstaff AZ 86011, USA; 3
Center for Environmental
Sciences & Education, Box 5694, Northern Arizona University, Flagstaff AZ 86011,
USA)
Received 17 February 2005; revised manuscript accepted 1 December 2005
Abstract: Continuous sediment, charcoal and pollen records were developed from a Â/4.5 m sediment core
from Little Molas Lake (LML), 3370 m elevation, San Juan County, CO. LML formed by 11 200 cal. BP
subsequent to glacial retreat. Turbated clay and gyttja was derived from in-lake productivity and outwash
sediments from the drainage basin from Â/11 200 cal. BP until Â/10 200 cal. BP. Cessation of glacial input
and replacement of tundra with Picea forest correlates with the termination of the Younger Dryas and
indicates warming. An increase in diploxylon pollen (cf. P. ponderosa), probably from lower elevations,
|
