Dating Exposed Rock Surfaces in the Arctic by Lichenometry: The Problem of Thallus Circularity and Its Effect on Measurement Errors
ABSTRACT. Lichenometry represents an extremely useful dating technique in the Arctic. It is most appropriate for exposed rock surfaces, which are abundant in most arctic environments, and on occasion it represents the only suitable technique for estimating the age of a surface. As a result, lichenom...
Main Author: | |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1985
|
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.94.8162 http://pubs.aina.ucalgary.ca/arctic/Arctic39-3-253.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.94.8162 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.94.8162 2023-05-15T14:19:48+02:00 Dating Exposed Rock Surfaces in the Arctic by Lichenometry: The Problem of Thallus Circularity and Its Effect on Measurement Errors John L. Innes The Pennsylvania State University CiteSeerX Archives 1985 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.94.8162 http://pubs.aina.ucalgary.ca/arctic/Arctic39-3-253.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.94.8162 http://pubs.aina.ucalgary.ca/arctic/Arctic39-3-253.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.aina.ucalgary.ca/arctic/Arctic39-3-253.pdf text 1985 ftciteseerx 2016-01-08T19:56:57Z ABSTRACT. Lichenometry represents an extremely useful dating technique in the Arctic. It is most appropriate for exposed rock surfaces, which are abundant in most arctic environments, and on occasion it represents the only suitable technique for estimating the age of a surface. As a result, lichenometry is being used in an increasing number of arctic studies. Despite this, controversy still surrounds the manner in which individual thalli are measured. The majority of workers measure either the longest axis or the diameter of the largest inscribed circle. The measurement error involved in the latter is significantly greater than that for longest axis measurements. The proportion of circular thalli on a surface decreases through time, and studies that use circular thalli only or inscribed circle diameters will underestimate the maximum growth rate of lichens on older surfaces. Key words: dating, lichenometry, moraines, measurement errors RÉSUMÉ. La lichenomdtrie est une technique de datation des plus efficaces dans l’Arctique. Les surfaces rocheuses expostes, abondantes dans la Text Arctic Arctic Unknown Arctic |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
ABSTRACT. Lichenometry represents an extremely useful dating technique in the Arctic. It is most appropriate for exposed rock surfaces, which are abundant in most arctic environments, and on occasion it represents the only suitable technique for estimating the age of a surface. As a result, lichenometry is being used in an increasing number of arctic studies. Despite this, controversy still surrounds the manner in which individual thalli are measured. The majority of workers measure either the longest axis or the diameter of the largest inscribed circle. The measurement error involved in the latter is significantly greater than that for longest axis measurements. The proportion of circular thalli on a surface decreases through time, and studies that use circular thalli only or inscribed circle diameters will underestimate the maximum growth rate of lichens on older surfaces. Key words: dating, lichenometry, moraines, measurement errors RÉSUMÉ. La lichenomdtrie est une technique de datation des plus efficaces dans l’Arctique. Les surfaces rocheuses expostes, abondantes dans la |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
John L. Innes |
spellingShingle |
John L. Innes Dating Exposed Rock Surfaces in the Arctic by Lichenometry: The Problem of Thallus Circularity and Its Effect on Measurement Errors |
author_facet |
John L. Innes |
author_sort |
John L. Innes |
title |
Dating Exposed Rock Surfaces in the Arctic by Lichenometry: The Problem of Thallus Circularity and Its Effect on Measurement Errors |
title_short |
Dating Exposed Rock Surfaces in the Arctic by Lichenometry: The Problem of Thallus Circularity and Its Effect on Measurement Errors |
title_full |
Dating Exposed Rock Surfaces in the Arctic by Lichenometry: The Problem of Thallus Circularity and Its Effect on Measurement Errors |
title_fullStr |
Dating Exposed Rock Surfaces in the Arctic by Lichenometry: The Problem of Thallus Circularity and Its Effect on Measurement Errors |
title_full_unstemmed |
Dating Exposed Rock Surfaces in the Arctic by Lichenometry: The Problem of Thallus Circularity and Its Effect on Measurement Errors |
title_sort |
dating exposed rock surfaces in the arctic by lichenometry: the problem of thallus circularity and its effect on measurement errors |
publishDate |
1985 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.94.8162 http://pubs.aina.ucalgary.ca/arctic/Arctic39-3-253.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic |
genre_facet |
Arctic Arctic |
op_source |
http://pubs.aina.ucalgary.ca/arctic/Arctic39-3-253.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.94.8162 http://pubs.aina.ucalgary.ca/arctic/Arctic39-3-253.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766291526800900096 |