Varves are amongst the smallest-scale events recognised in stratigraphy. Early Wisconsin lakes and glaciers in the Great Basin, U. Although the term varve was not introduced until the late nineteenth century, the concept of an annual rhythm of deposition is at least two centuries old. This cycle affects temperature, salinity, and silt content of waters as well as the seasonal production of plankton. Please contact the maintainer of this site. Inalthough varves were considered likely to give similar information to dendrochronologythey were considered "too uncertain" for use on a long-term timescale.
The melting season in a glacial lake is a time of heavy melting of snow on the glacier and the land surface surrounding the lake.
Keep Exploring Britannica Climate change. Please note that our editors may make some formatting changes or correct spelling or grammatical errors, and may also contact you if any clarifications are needed. In the s, Edward Hitchcock suspected laminated sediment in North America could be seasonal, and in Warren Upham postulated that light-dark laminated couplets represented a single year's deposition. This coarse unit represents a summer-ending event such as a late season precipitation or overturning event. Since the saline waters leave coarse particles all year, it is nearly impossible to distinguish the individual layers in salt waters.