The centrally protected Megalithic burial site at Cheramangad have different types like the topical ( umbrella stone ) hood-stone, multiple hood-stones, stone circle, and burials marked by a capstone only on the surface. One each of five types of burials was opened with a view to understanding the interrelationship between them.
Megalith-I, marked by a hood-stone revealed on excavation an internment of an urn within a pit measuring 1.05m in depth. The burial furniture inside the urn included highly disintegrated bones, a vase in red ware, russet-coated white painted ware bowl of concave profile with featureless rim. However, from outside the urn, a red ware vase, three bowls in black-and-red ware and an unidentified iron object, placed at different levels, were obtained. It was found that the urn, pyriform in shape in red ware, decorated with thumb impressed appliqué design on the shoulder was filled with sand. The urn was closed by a granite slab. The pit was filled with same soil retrieved while digging. It is sealed with nearly dressed semi-hemispherical laterite hood stone.
Megalith- II was of multiple hood-stone type made of eight clinostats. Excavation up to 1·95 m below the ground level did not yield any kind of interment. It was observed that the clinostats were buried in a pit dug specially for them.
Megalith- III was of topikal or Umbrella-stone type. The surface feature of this burial is characterised by four clinostats jointing p in to a square at the base on the outside and bevelled in such a way to close up along with diagonals of the square to carry a semi-hemispherical capstone. This burial too had no interment.
Megalith-IV, marked by a granite capstone (1·75 x 1·50 m), revealed similar internal features like that of megalith I with an urn interred in a pit cut into the lateritic natural soil; the urn contained, in all, eleven pots, majority of them being of red ware with fragments of bones deposited at the bottom No iron implement was recovered from this burial.
Megalith V was marked by a circle of laterite stones on the surface. Excavation revealed that within the circle; there were three pit-burials. Pit-A:The urn contained four arrowheads, two lamps with hooks, two tripod-stands, a hook, knife, sickle, rod, all made of iron , and a copper bowl, all deposited over a sand bed at the ,bottom of the urn. Pit- B: The urn yielded four rods, three ring-stands, two arrowheads, two lamps with hook and a sickle, all made of iron, and a copper bowl. Pit- C: It was also similar to Pit A and Pit B in all features. The urn was bigger, and yielded two tripod-stands, a knife, a lamp with handle, a carved rod, all made of iron and a copper bowl as usual deposited over a bed of sand
The excavation revealed several interesting features. The characteristic Topical and the multiple hood-stone type probably symbolic burials did not yield any interment. Secondly, Megalith V seems to be an important burial within the site because of its collective nature, large number of artefacts including the copper bowls, and the individual architectural features.