Unusual configuration of the Devonian-Pleistocene unconformity in the Susquehanna Valley, Oneonta, New York: Evidence for a subglacial meltwater inlet to glacial Lake Otego
- State Univ. of New York Coll., Oneonta, NY (United States). Dept. of Earth Sciences
A recently drilled test well and nearby abandoned bore hole have revealed anomalously shallow bedrock in a portion of the Susquehanna Valley near Oneonta, New York. Gravimetric and seismic refraction studies were conducted in the area to better delineate the Devonian--Pleistocene unconformity. On the northern flank of the valley, geophysical surveys indicate the presence of a shallowly buried bedrock shelf that is rimmed by a bedrock ridge. South of the ridge, bedrock drops abruptly beneath the thickening valley fill. This configuration contradicts predictions based upon projection of the valley walls to a classic U shape. These unusual features coincide with an extremely narrow portion of the valley, a recessional moraine and other stagnant ice features. The bedrock shelf may represent the initial glaciated valley floor. Incision of the valley floor below this surface can be attributed to scour by subglacial meltwaters at a nick point. As such, the narrow, deepest part of the bedrock valley may represent a subglacial inlet to glacial Lake Otego.
- OSTI ID:
- 5708506
- Report Number(s):
- CONF-9303211-; CODEN: GAAPBC
- Journal Information:
- Geological Society of America, Abstracts with Programs; (United States), Vol. 25:2; Conference: 28. annual Geological Society of America (GSA) Northeastern Section meeting, Burlington, VT (United States), 22-24 Mar 1993; ISSN 0016-7592
- Country of Publication:
- United States
- Language:
- English
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