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A diatomite layer covered by two till units was found at Horonkyl, Teuva, Pohjanmaa, western Finland. The diatomite layer represents infill sediment in a freshwater lake formed within a dead ice hollow in a glaciofluvial formation interpreted as an esker. The deposition of diatomite was terminated by advancing ice, which deformed underlying sediments and deposited the first till unit (Horonkyl till) in the sequence. During the ice retreat a silty clay layer was formed in the basin close to the ice front. A renewed glacal advance deposited the upper till unit (Horonp till).
Grönlund et al. (Sat,) studied this question.