It would be very interesting to know that the mountain route (path to spice route) was actually ended at Angamaly and the river originated from Western Ghats, flowing through Angamaly, was used for inland navigation, which was connected with the Arabian Sea. This wide and long river, later named as Periyar (In Tamil ‘periya are’ means large river), was partially diverted away from Angamaly during the great flood in 1341. This great flood resulted deposition of silt in the various locations of the river (This feature is very evident at the river strip of Naithode-Chethikode regions) and obstructed the river flow by reducing its volume. Now a days this river is known as Maanjally River.
The river (Maanjally River) almost surrounding Angamaly had great influence in the development of a unique community culture and also a main trade center. Recent years, the topographical structure of this river has been considerably changed again and reformed as a small stream. The olden remarkable memories of non-mechanized sailing vessels means flag vessels (pathamari) for foreign trades, warehouses, guard house, boat jetties, markets (angadies) etc located near the banks of this river are placed today in the history of myth. This was the river, which played a major role in the formation and concentration of ideal location of St Thomas Syrian Christians at Angamaly, from the beginning of Christian era.
It could be seen that the peculiar geographical features of Angamaly was the basis of the unique civilization in and around Angamaly during the ancient period. If we go through the Periyar valley civilization, a number of hidden facts can be revealed about Angamaly. From the adjacent regions of Angamaly, namely Kidagoor, Kodussery, Malluserry, Karippasserry etc, megalithic monuments were discovered during the last few decades. In the eastern side of the Angamaly, it was unearthed (1986) urn burial jars containing remains of rusted iron tools. From Kodusserry, 783 Roman silver coins were unearthed in 1987. These coins were used in Ist century A.D. in various parts of India, which points that Angamaly was well connected with the international and national trades.
An urn burial was discovered in January 2005 while digging for a foundation pit at Karippassery, a small hamlet near Vattaparambu village, lying about 5 km south east of Angamaly town in Ernakulam district. It was found in a plot owned by Mr. Sebi Kavallipadan. No mortuary goods were found in the urn but it was covered with pottery lid. A white sticky organic material, probably the disintegrated and decomposed bones was noticed in the bottom portion of the urn. The burial is datable to the Iron Age-Early Historic period.
The site is situated at about 10 m MSL on a sloping laterite flat surrounded by river terraces, palaeo channels and flood plains of the nearby rivers. A number of urn burials and few dolmenoid cists are reported in the nearby areas. A punch marked coin hoard and many megalithic burials were earlier found at Kodussery, about 1 km NE of the site.