Studies of varved clays
in West Virginia by Janssen and McCoy (1953) placed the minimum duration of Lake Tight at 6,500 years.
Van Asch, "Factors controlling the movement of a landslide in varved clays
near La Mure (French Alps)," Bulletin de la Societe Geologique de France, vol.
Due to scarcity of terrestrial plant macrofossils preserved in Late Glacial sediments, especially in varved clays
, AMS [sup.14]C data are still scanty, which prevents working out more precise Late Glacial time control and ice recession chronology in Estonia.
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.
The till is overlain by glaciolacustrine sands, silts or varved clays
, up to 25 m in thickness.
The thickness of soft varved clays
amounts to 10 m.
Most of it is composed of Late Weichselian till and glaciolacustrine sand, silt and varved clays
of the Baltic Ice Lake, and the Holocene marine and aeolian deposits.
In some places contemporary marine deposits are missing and Upper Pleistocene varved clays
are exposed on the seabed.
Glaciolacustrine varved clays
in the northern part of the lake depression were deposited approximately between 13 500 and 13 100 cal years BP.
Evidence is derived from the occurrence of varved clays
in the Tanassilma-Viljandi valley, particularly in the Navesti Depression, where in the vicinity of the railway bridge varved clay
lenses can be found between till layers.
Following the ice retreat from the central and southern parts of the study area in the Saadjarve Drumlin Field, the deposition of glacial varved clays
took place over a relatively short time period (up to 63 years).