The orientation of port-holes and entrances on the cist graves is frequently towards the south. [...] This demands comparison with later Indian tradition where south is the quarter of Yama. Among the grave goods, iron is almost universal, and the occasional iron spears and tridents (trisulas) suggest an association with the god Siva. The discovery in one grave of a trident with a wrought-iron buffalo fixed to the shaft is likewise suggestive, for the buffalo is also associated with Yama, and the buffalo demon was slain by the goddess Durgà, consort of Siva, with a trident. [...] The picture which we obtain from this evidence, slight as it is, is suggestive of some form of worship of Siva.

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "The orientation of port-holes and entrances on the cist graves is frequently towards the south. [...] This demands comparison with later Indian tradition where south is the quarter of Yama. Among the grave goods, iron is almost universal, and the occasional iron spears and tridents (trisulas) suggest an association with the god Siva. The discovery in one grave of a trident with a wrought-iron buffalo fixed to the shaft is likewise suggestive, for the buffalo is also associated with Yama, and the buffalo demon was slain by the goddess Durgà, consort of Siva, with a trident. [...] The picture which we obtain from this evidence, slight as it is, is suggestive of some form of worship of Siva." in the context of "Bridget and Raymond Allchin, The Rise of Civilization in India and Pakistan, p.339-340.https://archive.org/details/riseofcivilizati0000allc/page/338/mode/2up
• quoted in VEDIC ROOTS OF EARLY TAMIL CULTURE Michel Danino Written in 2001 and published in Saundaryashri: Studies of Indian History, Archaeology, Literature and Philosophy (Festschrift to Professor Anantha Adiga Sundara), P. Chenna Reddy, (ed.), Sharada Publishing House, New Delhi, 2009, pp. 19–30." to mean that wisdom is timeless.