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 1500 to 500 BCE, contributed the foundations of several cultural aspects of the Indian subcontinent. In terms of culture, many regions of the Indian subcontinent transitioned from the Chalcolithic to the Iron Age in this period.