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- Usage in publication:
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- Hobart Till
- Hobart glaciation
- Modifications:
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- Original reference
- Dominant lithology:
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- Till
- AAPG geologic province:
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- Sierra Nevada province
Summary:
Pg. 810-825. Hobart Till; Hobart glaciation. Oldest of four glaciations in Lake Tahoe region, northern California. Succeeded by Donner Lake glaciation (new). Followed Pliocene-Pleistocene deformation of Sierra Nevada and subsequent erosion of the valley to about present level. Hobart Till is highly weathered, as shown by depth of oxidation, high clay content, disintegrated granitic boulders, and weathering rinds on volcanic boulders. At type locality is overlain upslope by Tahoe Till. Soils and amount of subsequent erosion indicate that Hobart-Donner Lake interglacial was probably longest of the interglacials.
Type section: ground moraine exposed in Highway 40 Freeway roadcut north end of Truckee, just west of Trout Creek overpass, in south-central part sec. 10, T. 17 N., R. 16 E. Named from outcrops in roadcuts along Highway 89 west of Hobart Mills and Highway 40 Freeway north of Truckee, [Nevada Co.], eastern northern CA.
Source: US geologic names lexicon (USGS Bull. 1350, p. 335-336).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).