21 Reads
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180 Citations
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21 Reads
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180 Citations
... A 30-40 m wide, sinuous ridge on southwest rim of the Charity Shoal structure is likely an esker formed during ice retreat ( Figure 3). The glacial erosional features record a final southwestward readvance of the Laurentide Ice Sheet (Ontario lobe, ca. 13 ka) into the Lake Ontario basin (Barnett, 1991;Gilbert & Shaw, 1992;Sookhan et al., 2018). A similar pattern of glacial erosion and modification of the surface bedrock rim is also a feature of the Holleford impact crater (see Discussion). ...