Question

The megalithic people surrounded the graves with large piece of stone called​

Answer 1

Dolmenoid cists consists of square or rectangular box-like graves built of several orthostats (upright stone or slab) one or more for each side, supporting the super incumbent capstone consisting of one or more stones, often with the floor also paved with the stone slabs.

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Answer 2

Answer:

Cist

Cist is a small stone-built coffin-like box or ossuary used to hold the bodies of the dead. Burials are megalithic forms very similar to dolmens in structure. These type of burials were completely underground