Research Article| April 01, 1972 Quaternary History of Northern Cumberland Peninsula, East Baffin Island, N.W.T., Canada Part VI: Preliminary Lichen Growth Curve for Rhizocarpon geographicum G. H MILLER; G. H MILLER Institute of Arctic and Alpine Research; and Department of Geological Sciences, University of Colorado, Boulder, Colorado, 80302 Search for other works by this author on: GSW Google Scholar J. T ANDREWS J. T ANDREWS Institute of Arctic and Alpine Research; and Department of Geological Sciences, University of Colorado, Boulder, Colorado, 80302 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1972) 83 (4): 1133–1138. https://doi.org/10.1130/0016-7606(1972)83[1133:QHONCP]2.0.CO;2 Article history received: 06 Oct 1971 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation G. H MILLER, J. T ANDREWS; Quaternary History of Northern Cumberland Peninsula, East Baffin Island, N.W.T., Canada Part VI: Preliminary Lichen Growth Curve for Rhizocarpon geographicum. GSA Bulletin 1972;; 83 (4): 1133–1138. doi: https://doi.org/10.1130/0016-7606(1972)83[1133:QHONCP]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract A graph showing the relation between maximum thallus diameter of Rhizocarpon geographicum and age of the individual is presented as an aid to detailed chronological studies in this section of the eastern Canadian Arctic. The curve is derived from: (1) historically dated surfaces; (2) measured growth of Alectoria minuscula for a two year period; (3) the inter-specific ratios of A. minuscula/R. geographicum; and (4) radiocarbon-dated surfaces associated with lichens. The size/age curve for R. geographicum shows an initial fast rate of growth of 0.15 mm yr−1 which falls off to approximately 0.03 mm yr1−1 after the passage of 250 to 300 yrs. Extrapolation of the curve back to about 9,500 B.P., when individual maximum thalli would be 280 mm in diameter, is in accord with independent geological dating. The linear growth phase of 0.03 mm yr−1 is remarkably similar to rates derived from the Colorado Front Range and the St. Elias Mountains, Alaska, and prompts speculation as to whether this particular lichen species may not have a single growth curve regardless of location. Contrary evidence is also presented. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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Miller et al. (1972) studied this question.