Glacial varves

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Glacial varves dating to 260 million years ago. Varves are layers of sediment that are laid down annually. Glacial varves are formed under glacial lakes. The thickness of the layers can give information about climatic conditions, with thicker layers resulting from warmer years.

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Photo credit: © MARCO ANSALONI / SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -, annual, climate, cyclic, deposit, earth, geographical, geography, geological, geology, glacial, lacier, lake, layered, layers, mineral, museum, prehistoric, prehistory, rock, science, sediment, sedimentary, varve, varves, yearly