Trimlines and Paleonunataks

Paleonunataks are mountain summits that remained above the surface of Pleistocene ice sheets and ice fields. Periglacial (or glacial) trimlines are weathering limits separating glacially eroded terrain on lower slopes from periglacial morphology on summits and plateaus. Trimlines were traditionally...

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Bibliographic Details
Main Author: Ballantyne, C. K.
Format: Book Part
Language:English
Published: Elsevier Inc. 2013
Subjects:
Blockfields
Clay mineralogy
Cosmogenic isotopes
Frost action
Glacial erosion
Glacier reconstruction
Last Glacial Maximum
Nunataks
Paleonunataks
Periglacial
Regolith
Relative-age dating
Surface exposure dating
Tors
Trimlines
Weathering limits
Cold-based glacier
Online Access:https://risweb.st-andrews.ac.uk/portal/en/researchoutput/trimlines-and-paleonunataks(4448dd5c-3f92-4b21-99f8-ed8f9c66014e).html
https://doi.org/10.1016/B978-0-444-53643-3.00080-7
http://www.scopus.com/inward/record.url?scp=84897029079&partnerID=8YFLogxK
Description
Summary:Paleonunataks are mountain summits that remained above the surface of Pleistocene ice sheets and ice fields. Periglacial (or glacial) trimlines are weathering limits separating glacially eroded terrain on lower slopes from periglacial morphology on summits and plateaus. Trimlines were traditionally interpreted as representing the upper limits of former ice masses, but it is now established that many trimlines represent the transition zone between an upper zone of landforms preserved under cold-based glacier ice and a lower zone of glacial erosion. Approaches to the interpretation of trimlines include relative-age dating, surface exposure dating, geomorphological evidence, and paleoglaciological constraints.

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