
Iron age is commonly named Megalithic age characterized by the practice of raising big stone monuments to the dead.Megalithic tradition reached Kerala around the mid -first millennium BC and continued to prevalent till the mid first millennium AD about ten centuries.Various types of burials such as urns, cysts,stone circles,cap stones ,umbrella stones,rock cut chambers are found in this area.
A dolmen has one or two chambers constructed using dressed granite slabs.Dolmens are usually found normally in granite belts especially in high ranges.eg, dolmens in Marayur.They are found in rocky tables of plane also eg.Porkkulam in Trichur district.We call dressed granite slabs orthostats.The Marayur dolmens are characterized by the presence of orthostats and a cover slab.They are found as scattered at some places suggest a pattern of assemblage.

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