Karewas are the thick deposits of glacial clay and other materials embedded with moraines. These deposits are found in the Kashmir valley between pir panjal and Zaskar range in the Himalaya. Geologists consider that area of Kashmir valley was filled with water of Thesis sea but with the passage of time many earthquakes came and a part of Baramulla range broken down, that resulted in emptying of water from the valley leaving behind the molds of karewas. These karewas are widespread to the west of river Jhelum in the valley.
Karewa sediments are witness to and treasure of many human civilizations and habitations. The Stone Age man has survived the harshest of the Pleistocene glaciations. The artifacts left by him are still entrenched in the deep soil horizons of the plateau lands. The choppers, hand axes, and sharp stone blades are worth mentioning, forming a storehouse of the Stone Age factory.