Evidence of glacial activity during MIS 4 in the Rocky Mountains, Colorado, USA

The Ziegler Reservoir fossil site near Snowmass Village, Colorado, provides a rare opportunity to examine environmental conditions in the Rocky Mountains during marine isotope stage (MIS) 4 (71–57 ka). Although recognized as a global-scale cold event, MIS 4 is typically absent from Rocky Mountain gl...

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Autores principales:	Jeffrey S. Honke, Jeffrey S. Pigati, J. Michael Daniels
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	glacial chronology marine isotope stage 4 rocky mountains ziegler reservoir fossil site Environmental sciences GE1-350 Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/8689d28128ff4ab280f287e532d4725a
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spelling	oai:doaj.org-article:8689d28128ff4ab280f287e532d4725a2021-11-04T15:00:42ZEvidence of glacial activity during MIS 4 in the Rocky Mountains, Colorado, USA1523-04301938-424610.1080/15230430.2021.1979167https://doaj.org/article/8689d28128ff4ab280f287e532d4725a2021-01-01T00:00:00Zhttp://dx.doi.org/10.1080/15230430.2021.1979167https://doaj.org/toc/1523-0430https://doaj.org/toc/1938-4246The Ziegler Reservoir fossil site near Snowmass Village, Colorado, provides a rare opportunity to examine environmental conditions in the Rocky Mountains during marine isotope stage (MIS) 4 (71–57 ka). Although recognized as a global-scale cold event, MIS 4 is typically absent from Rocky Mountain glacial chronologies because the geologic evidence was covered or destroyed during the subsequent, and more extensive, MIS 2 (Pinedale; 29–14 ka) glaciation. Ziegler Reservoir lies beyond the Pinedale glacial extent, which allowed for the preservation of a long-lived sequence of eolian sediments deposited in a lacustrine environment that spans from late MIS 6 (ca. 140 ka) through early MIS 3 (ca. 55 ka). Sediments dating to MIS 4 exhibit a significant increase in clay-sized particles, suggesting that the source areas, most likely nearby glacio-fluvial deposits, were enriched with fine-grained material at that time. We hypothesize that the elevated clay content was the result of rock flour production by nearby valley glaciers that were active in the Rocky Mountains during MIS 4. The results of our study illustrate how recognizing indirect evidence of glacial activity can result in a more complete record of past climate conditions than what could be achieved by the study of moraines alone.Jeffrey S. HonkeJeffrey S. PigatiJ. Michael DanielsTaylor & Francis Grouparticleglacial chronologymarine isotope stage 4rocky mountainsziegler reservoir fossil siteEnvironmental sciencesGE1-350EcologyQH540-549.5ENArctic, Antarctic, and Alpine Research, Vol 53, Iss 1, Pp 252-268 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	glacial chronology marine isotope stage 4 rocky mountains ziegler reservoir fossil site Environmental sciences GE1-350 Ecology QH540-549.5
spellingShingle	glacial chronology marine isotope stage 4 rocky mountains ziegler reservoir fossil site Environmental sciences GE1-350 Ecology QH540-549.5 Jeffrey S. Honke Jeffrey S. Pigati J. Michael Daniels Evidence of glacial activity during MIS 4 in the Rocky Mountains, Colorado, USA
description	The Ziegler Reservoir fossil site near Snowmass Village, Colorado, provides a rare opportunity to examine environmental conditions in the Rocky Mountains during marine isotope stage (MIS) 4 (71–57 ka). Although recognized as a global-scale cold event, MIS 4 is typically absent from Rocky Mountain glacial chronologies because the geologic evidence was covered or destroyed during the subsequent, and more extensive, MIS 2 (Pinedale; 29–14 ka) glaciation. Ziegler Reservoir lies beyond the Pinedale glacial extent, which allowed for the preservation of a long-lived sequence of eolian sediments deposited in a lacustrine environment that spans from late MIS 6 (ca. 140 ka) through early MIS 3 (ca. 55 ka). Sediments dating to MIS 4 exhibit a significant increase in clay-sized particles, suggesting that the source areas, most likely nearby glacio-fluvial deposits, were enriched with fine-grained material at that time. We hypothesize that the elevated clay content was the result of rock flour production by nearby valley glaciers that were active in the Rocky Mountains during MIS 4. The results of our study illustrate how recognizing indirect evidence of glacial activity can result in a more complete record of past climate conditions than what could be achieved by the study of moraines alone.
format	article
author	Jeffrey S. Honke Jeffrey S. Pigati J. Michael Daniels
author_facet	Jeffrey S. Honke Jeffrey S. Pigati J. Michael Daniels
author_sort	Jeffrey S. Honke
title	Evidence of glacial activity during MIS 4 in the Rocky Mountains, Colorado, USA
title_short	Evidence of glacial activity during MIS 4 in the Rocky Mountains, Colorado, USA
title_full	Evidence of glacial activity during MIS 4 in the Rocky Mountains, Colorado, USA
title_fullStr	Evidence of glacial activity during MIS 4 in the Rocky Mountains, Colorado, USA
title_full_unstemmed	Evidence of glacial activity during MIS 4 in the Rocky Mountains, Colorado, USA
title_sort	evidence of glacial activity during mis 4 in the rocky mountains, colorado, usa
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/8689d28128ff4ab280f287e532d4725a
work_keys_str_mv	AT jeffreyshonke evidenceofglacialactivityduringmis4intherockymountainscoloradousa AT jeffreyspigati evidenceofglacialactivityduringmis4intherockymountainscoloradousa AT jmichaeldaniels evidenceofglacialactivityduringmis4intherockymountainscoloradousa
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Evidence of glacial activity during MIS 4 in the Rocky Mountains, Colorado, USA

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