Figure 2 - uploaded by David R. Sharpe
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Waterloo Moraine cross-section from Manheim to Saint Agatha displays the transition from coarse to fine sediment texture (right to left) in selected borehole logs. Note small number of fining upward trends in borehole logs. Base is commonly underlain by diamicton, Maryhill Till or catfish Creek Till.
Source publication
Many moraines in Ontario are important areas of groundwater recharge. Moraine topography and structure controls the transmission of water from surface to groundwater and regional aquifers. An improved understanding of moraines in southern Ontario is of particular interest due to increased concern over source water protection (TEC, 2004). The Waterl...
Contexts in source publication
Context 1
... stratigraphy: The gross stratigraphic architecture of the moraine is being mapped in subsurface as part of a regional 3D stratigraphic modeling program using Viewlog software ( Fig. 2; Bajc and Newton, this vol). Within this framework, spatial variations in sediment texture can be identified. From east to west, sediment texture fines from sand and gravel to mud and muddy diamicton, and bed thickness decreases (Fig. ...
Context 2
... is being mapped in subsurface as part of a regional 3D stratigraphic modeling program using Viewlog software ( Fig. 2; Bajc and Newton, this vol). Within this framework, spatial variations in sediment texture can be identified. From east to west, sediment texture fines from sand and gravel to mud and muddy diamicton, and bed thickness decreases (Fig. ...
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Citations
The Oak Ridges Moraine in southern Ontario is a ca. 160 km long east-west trending ridge of sand and gravel situated north of Lake Ontario. Study of the Oak Ridges Moraine in the Humber River watershed was undertaken to assess its role in the groundwater system of the buried Laurentian Valley. The Oak Ridges Moraine is interpreted to have been deposited in three stages. Stage I records rapid deposition from hyperconcentrated flows where tunnel channels discharged into a subglacial lake in the Lake Ontario basin. Low-energy basin sedimentation of Stage II was in a subglacial and ice-contact setting of a highly crevassed ice sheet. Stage III sedimentation is characterized by rapid facies changes associated with esker, subaqueous fan, and basinal sedimentation. Detailed sediment analysis challenges the concept that the Oak Ridges Moraine was deposited principally from seasonal meltwater discharges, climatic modulated ice-marginal fluctuations, or in an interlobate position. Instead it is interpreted to have formed in response to late-glacial ice sheet events associated with subglacial meltwater ponding, episodic and catastrophic subglacial meltwater discharge, and subsequent seasonal meltwater discharge. The moraine probably formed as the glacial-hydraulic system re-equilibrated to the presence of a thinned, grounded ice shelf and a subglacial lake in the Lake Ontario basin.
