Glacial abrasion is commonly characterized by glacial striations. The landscape is very rocky from glacial meltwater deposits. From the high mountains the rivers discharge into large glacial lakes. Supraglacial moraines are created by debris accumulated on top of glacial ice. The lake is of mixed glacial and tectonic origin. Many valleys are littered with glacial deposits from the period of glacial retreat. Low sea levels, interglacial and glacial periods facilitated these migrations. They are fed by myriad lakes, glacial melts and streams. It is the remains of a glacial moraine. Abrasion produces fine sediment, termed glacial flour. They may also be glacial headwaters, waters formed by the melting of glacial ice. Local bedrock is Manhattan schist with glacial striations. The town is home to many glacial features including drumlins, eskers, and glacial erratics. Cold water was everywhere due to glacial melt. Till is the rock of soil material transported or deposited by glacial ice.