Northeastern Section - 44th Annual Meeting (2224 March 2009)
Paper No. 17-16
Presentation Time: 1:00 PM-5:00 PM

VARVE STRATIGRAPHY FROM WETLAND CORES, OSWEGO COUNTY, NEW YORK

WALKER, Thomas B., Department of Earth Sciences, State University of New York at Oswego, Oswego, NY 13126, twalker@oswego.edu

Work done to correlate varve sections form Pennsylvania, Vermont, and New Hampshire have been the focus many studies to understand the last episode of deglaciation in North America. Central New York has been largely over looked as a place of study for insight into the timing and sequence of deglaciation during the Pliestocene. However, an excellent study area exists just southeast of Lake Ontario in Oswego County. The land having been shaped and sculpted by glacial outwash and sediment deposits, Oswego County provides an excellent location to study the depositional processes of small glacial lakes (now swamps and wetlands) with varve records. Therefore, a study is underway to characterize the distribution of ancient glacial lakes with varve deposits in Oswego County to make comparison with studies from other regions of the northeast US. As well, this study seeks to correlate the varve records found in the ancient glacial lakes with the timing of deglaciation and provide insight into the last cycles of glacial advance and retreat in central New York. During the dry season of 2007 and 2008, when local wetlands are accessible, vibracores were collected at several locations. The margins of the wetlands are underlain by finely stratified sand, silt with less clay. In one core, gravel was found in the sandy deposits. These materials are interpreted as proximal outwash. Cores collected tens of meters from the wetland margin contain varves with a proportion of clay and silt that is about equal. Individual silt-clay couplets range in thickness from about 2 to 10 cm. The varve deposits overlie course gravel and sand, that is most likely the ablation till that forms the bedrock cover in most of southern Oswego County. Detailed analysis of the varve stratigraphy from adjoining wetlands will be presented.

Northeastern Section - 44th Annual Meeting (2224 March 2009)
General Information for this Meeting
Session No. 17--Booth# 16
Geomorphology/Quaternary Geology (Posters)
Holiday Inn By the Bay: Casco Bay Hall
1:00 PM-5:00 PM, Sunday, 22 March 2009

Geological Society of America Abstracts with Programs, Vol. 41, No. 3, p. 26

© Copyright 2009 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.