Holocene vegetational history of the Kootenai River valley, Montana

Auteurs :
MACK, R. N.
RUTTER, N. W.
VALASTRO, S.

Description :
Pollen records reveal a five-zone sequence of Holocene vegetation change since the initiation of sedimentation ca. 10,540 yr B.P. Initial vegetation on the newly deglaciated terrain reflects a relatively cool, moist macroclimate. Pollen Zone II (ca. 11,000-7 100 yr B.P.) represents a warmer microcimate. After 7 100 yr B.P. (Pollen zone III) diploxylon pines indicate an expansion of xerophytic forest. A short-term climatic trend with more available water began after ca. 4 000 yr B.P. Emergence of the modern microclimate is indicated primarily with the first regular appearance of Tsuga heterophylla in the pollen record by ca. 2 700 yr B.P.


Type de document :
Article de périodique

Source :
Quaternary research New York, 1983, vol. 20, n°. 2, p. 177-193, Références bibliographiques : 48 réf.

Date :
1983