Biogenic varves

Biogenic varves result from biological production of organic matter and biomineralisation (opal and carbonate as microfossils) in the water column. After the death of organisms their organic matter is largely remineralised and only a small portion is incorporated in the sediment where it is subject to further biodegradation and early diagenesis.

Name Country Site image
Lake Sagtjennet
biogenic varves
Norway
Lake Xiaolongwan
biogenic varves
China