The Vedic period is named after the Indo-Aryan culture of north-west India, although other parts of India had a distinct cultural identity during this period. The Vedic culture is described in the texts of Vedas, still sacred to Hindus, which were orally composed in Vedic Sanskrit. The Vedas are some of the oldest extant texts in India. The Vedic period, lasting from about 1750 to 500 BCE, and contributed the foundations of several cultural aspects of Indian subcontinent. In terms of culture, many regions of the subcontinent transitioned from the Chalcolithic to the Iron Age in this period.