The Vedas are divided into four parts. Rigveda is the oldest, most of its contents were probably formed in the middle of 2000 BC, and all its compilations were not later than 1000 BC. Therefore, this period is usually called the Rigvedic Age or the Early Vedic Age. Samoyed Veda, Yeroveda and Adaveda were generally formed in the first half of 10 century BC, and Adaveda assembled at the latest. This period is often called the Late Vedic Age. The era of writing Vedas is called Vedic Period in India. It uses a language older than Indian Sanskrit, called Vedic Sanskrit.