BICYCLE POND, SOUTH-CENTRAL OREGON, U.S.A.

A pollen record spanning 9,000 years from Bicycle Pond in the Warner Valley of south-central Oregon, reflects changes in local spring discharge during the Holocene, as well as of continuous changes in terrestrial vegetation since before the fall of Mazama Ash. Evidence of Holocene forest expansion and contraction from here can be compared with other pollen records in the area such as that obtained from the 46,000-year core from McCoy Flat on Pine Creek west of Eagle Lake, California. The pollen record here indicates both early and late Holocene expansions of juniper woodland. Thin volcanic ashes found in deeper probes in Bicycle Pond indicate that a late Pleistocene record may be found here as well.

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