In the master core (S-2009) basal sandy silt (till) is overlain by reddish-brown varved clay
(core depth 745-708 cm) in which 29 annual varves were identified (Fig.
Comments: The site is on a deep varved clay
deposit (Connecticut Valley Varved Clay
) on the University of Massachusetts, Amherst campus.
5 m thick varved clay
layer between the Warthanian (Late Saalian) till and the Eemian sediments in the Licze core in northern Poland.
Consequently, the formation of bottom deposits may have been influenced by currents and wave activity, but the erosion areas are located near the deposition area--inside the bay (till and varved clay
exposed on the seafloor) or on bordering peninsulas (bedrock).
5 km north of the city boundary, 2-3 m thick lenses of varved clay
were found in the lower part of the sand layer.
In the coastal zone and areas around the inflows to the lake, the varved clay
is often covered with a thick layer of silt or sand.
Proglacial varved clay
is outcropping in the northern part of the lake bottom.
Very thin varves with a changing thickness and grain-size of the material in the upper portion of the varved clay
are present only in few sites.
The lowermost unit A consists of brownish-grey proglacial varved clay
which lies on top of Late Weichselian till.
Laminated clayey deposits (Photo 1E) or brecciated varved clay
inclusions and coarse-clastic diamicton lenses are found in this depositional unit.
Lake Timiskaming (100 km long, 200 m maximum depth) is the postglacial successor to glacial Lake Barlow; Barlow varved clays
are present below the floor of Lake Timiskaming as far south as the McConnell Moraine (Fig.
The other type of sand is formed as a result of submarine erosion of Late Pleistocene varved clays
up to 30 cm thick (alternating varved horizontal layers of brown clays and grey silty layers) are located in the nearshore, whereas below the sand accretion terrace on the bottom surface there are traces of submarine erosion, indicating sediment transport in NW direction.