Preexisting fractures and the formation of an iconic American landscape: Tuolumne Meadows, Yosemite National Park, USA Becker, Richard Tikoff, Basil Iverson, Neal Riley, Paul Iverson, Neal
dc.contributor.department Geological and Atmospheric Sciences 2018-02-18T09:28:16.000 2020-06-30T04:03:26Z 2020-06-30T04:03:26Z Wed Jan 01 00:00:00 UTC 2014 2014-11-01
dc.description.abstract <p>Tuolumne Meadows, in Yosemite National Park (USA), is a large sub-alpine meadow in the Sierra Nevada Mountains. Immediately adjacent to Tuolumne Meadows—and underlain by the same bedrock lithology (Cathedral Peak Granodiorite)—are vertical rock faces that provide exceptional opportunities to climbers. While the presence of a broad meadow suggests bedrock erodibility, the vertical rock walls indicate bedrock durability. We propose that the Tuolumne Meadows’s landscape is the result of variable glacial erosion due to the presence or absence of pre-existing bedrock fractures. The meadows and valleys formed because of concentrated tabular fracture clusters—a distinctive and locally pervasive type of fracturing—that were particularly susceptible to glacial erosion. In contrast, the vertical rock walls consist of sparsely fractured bedrock that was originally bounded by zones of pervasive tabular fracture clusters. Glacial erosion preferentially removed the highly fractured rock, forming prominent ridges in the upland surrounding Tuolumne Meadows. The orientation and spacing of the tabular fracture clusters, relative to ice flow, has exerted a fundamental control on the geomorphology of the area. The erosional variability exhibited by a single lithology indicates that the degree of fracturing can be more important than the host lithology in controlling landscape evolution.</p>
dc.description.comments <p>This article is from <em>GSA Today </em>24 (2014): 4, doi:<a href="" target="_blank">10.1130/GSATG203A.1</a>. Posted with permission.</p>
dc.format.mimetype app
dc.identifier archive/
dc.identifier.articleid 1136
dc.identifier.contextkey 10068517
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ge_at_pubs/151
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 20:35:49 UTC 2022
dc.source.uri 10.1130/GSATG203A.1
dc.subject.disciplines Geomorphology
dc.subject.disciplines Glaciology
dc.title Preexisting fractures and the formation of an iconic American landscape: Tuolumne Meadows, Yosemite National Park, USA
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 8f9617fd-0ee4-4473-b7bb-ef722542e676
relation.isOrgUnitOfPublication 29272786-4c4a-4d63-98d6-e7b6d6730c45
Original bundle
Now showing 1 - 1 of 1
4.12 MB
Adobe Portable Document Format