Päälohkareita

Päälohkareita refers to large rock fragments or blocks found in glacial deposits. These are typically composed of bedrock material that has been broken apart by glacial action, such as freeze-thaw cycles and the immense pressure of ice. Päälohkareita can vary significantly in size, from a few meters to tens of meters in diameter. They are often found embedded within or lying on top of moraines, which are accumulations of glacial till.

The origin of päälohkareita is usually local or regional, meaning they were transported relatively short distances from their original bedrock source. Their composition can therefore provide clues about the geology of the upstream glacial drainage basin. Geologists study these erratics to understand glacial movement patterns, the extent of ice sheets, and the geological history of an area. Identifying the type of rock and its original location can help reconstruct past glacial landscapes and shed light on geological processes. The presence of a päälohkare is a clear indicator of past glacial activity.