Kapperinmäki Esker

Kapperinmäki Esker is a locally preserved glacial ridge in Finland made of sand and gravel. It is an esker, meaning its raised form records sediment left by meltwater associated with retreating ice. [General esker reference](https://en.wikipedia.org/wiki/Esker)

Meltwater flowed through or beneath glacial ice and carried sand and gravel through a confined channel. When the ice disappeared during deglaciation, the sediment remained as the Kapperinmäki ridge. [General esker reference](https://en.wikipedia.org/wiki/Esker)

An esker is mainly a meltwater deposit with layered sand and gravel, while a moraine is sediment dumped directly by moving or melting ice. Kapperinmäki is therefore classified by its glaciofluvial origin rather than as a typical till ridge. [General esker reference](https://en.wikipedia.org/wiki/Esker)

Its surviving sand-and-gravel body still shows the shape and material of a meltwater channel from Finland's glacial past. Preserved eskers are useful because they retain evidence of ice retreat even after the glacier itself has vanished. [General esker reference](https://en.wikipedia.org/wiki/Esker)