Glacial erratic boulders of Estonia

[2] Glacial erratic boulders are found in especially large quantities in Estonia.

Some particular large ones have been found in the sea, including some near Osmussaar that are 100 metres diameter.

The Osmussaar boulders are believed to have been pushed there by glaciers from the Neugrund meteorite crater.

[3] The Estonian boulders were important in the development of the idea that northern Europe was once covered in glaciers.

The first to suggest that the boulders were moved by glaciers was Russian mineralogist Vasily Severgin who was led to this conclusion by their similarity to Finnish basement rock at the very early date of 1815.