Lichenometric dating of rock surfaces in the Northern Cascade Range, USA

Auteur(s) et Affiliation(s)

O'NEAL, M.A.

Dep. of Geological Sciences, Univ. Delaware, Newark, Etats-Unis

Dept. of Geography, Univ. of Delaware, Newark, Etats-Unis

LEGG, N.T.

College of Earth, Ocean, and Atmospheric Sciences (CEOAS), Oregon State Univ., Corvallis, Etats-Unis

HANSON, B.

Dept. of Geography, Univ. of Delaware, Newark, Etats-Unis

MORGAN, D.J.

Dept. of Earth and Environmental Sciences, Univ., Vanderbilt, Etats-Unis

ROTHGEB, A.

Dept. of Geography, Univ. of Delaware, Newark, Etats-Unis

Description :
This study presents a growth curve developed from direct and indirect growth rates of Rhizocarpon geographicum lichens from study sites on Mounts Baker, Rainier, Adams, and Hood in the northern Cascade Range of the western USA. The observations of direct growth rates are based on 31 measurements of 11 lichens growing on different surfaces. This direct growth rate dataset is complemented by indirect growth rates based on measurements of the largest lichen observed on 20 different surfaces over 24-33 yr periods. The revised growth curve for the study area extends the applicable range for dating rock surface in the study area to the seventeenth century, approximately 175 years longer than previous calibrated curves.

Type de document :
Article de périodique

Source :
Geografiska annaler. Series A. Physical geography, issn : 0435-3676, 2013, vol. 95, n°. 3, p. 241-248-, Références bibliographiques : 35 ref.

Date :
2013

Editeur :
Pays édition : Suede, Stockholm, Svenska sällskapet för antropologi och geografi

Langue :
Anglais