till sheet

till sheet

[′til ‚shēt]
(geology)
A sheet, layer, or bed of till.
References in periodicals archive ?
Now we are beginning to find these buried lake floor sediments themselves beneath the uppermost till sheet in Huron County (Campbell 1955), and Seneca County (Coash personal communication).
This will allow the source of anomalous radioactivity encountered in the drill holes to be identified, and a distinction between thorium, potassium and uranium sources in the till sheet (glacial overburden) will be made.
Similarity in the properties of diamictons in a single till sheet separated by over 150 km suggests that provenance and genetic processes were the same on both sides of Lake Michigan.
The depth of these radioactive sections is consistent with a till sheet dipping to the NE from the uranium boulder at surface through PDD11-07 to the deeper section in PDD11-06.
The till sheet averages 3 m in thickness but can be up to 20 m thick in drumlins.
The shallower depth of the anomalous radioactivity in PDD11-07 could be consistent with a semi-continuous till sheet dipping to the northeast towards a possible up-ice bedrock source for the uranium boulders.
These data indicate that a single till sheet was deposited as the dominant ice-flow direction fluctuated between east, south-southwest, and east-southeast across the study area.
Ballantyne and Matthews (1983) documented polygonal fracture development on a newly exposed till sheet in the periglacial environment in front of a retreating glacier where the mean annual temperature was -1 [degrees] to -2 [degrees] C (30-28 [degrees] F).
These data indicate that a single till sheet, 1-4 m thick, was deposited as the dominant ice-flow direction fluctuated between southeastward, eastward, and northward over the study area.
The Wisconsinan till sheet of central and western Ohio south of the Powell and Union City moraines is considered relatively uniform in chemical and physical properties.
As many as eight or nine distinct till sheets overlap in western Indiana.
Recent sampling had been able to distinguish between at least two till sheets, which cover the property.