title: Enclosed bark as a pollen trap.
abstract: Counts were made of pollen in traps formed by enclosed bark in two remnants of bristlecone pine, Pinus aristata Engelm., from the White Mountains of east-central California. The traps, dated by tree-rings at A.D. 350 and 1300 B.C., contained a major complex of pine-sagebrush pollen and traces of other species, representing the equivalent of the present vegetation.
authors.forename: D P
authors.initials: DP
authors.lastname: Adam
authors.forename: C W
authors.initials: CW
authors.lastname: Ferguson
authors.forename: V C
authors.initials: VC
authors.lastname: Lamarch