The river is flowing on bedrock in the upper image, but because sediment was deposited over time the riverbed has risen. This has caused the house to be buried in the lower image. A change in climate, land use, or geologic activity may have caused the aggradation. For example, volcanic eruptions may lead to rivers carrying large amounts of sediment that can accumulate in a channel and bury the old channel and floodplain.
An aeolian component in Pleistocene and Holocene valley aggradation: evidence from Dicks Creek catchment, Yass, New South Wales.(Statistical Data Included)
Jan 01, 2001; Introduction The study of Quaternary processes within the Southern Highlands of New South Wales has evoked considerable interest...