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This report prepared on behalf of Cork County Council has been undertaken to describe the results of an excavation at a site of archaeological significance, Chetwynd 1, Co. Cork. The excavation of site Chetwynd 1 (Areas A & B) was undertaken along the route of the proposed N71 Chetwynd Viaduct Road Scheme situated approximately 9km south west of Cork City. Excavation of site Chetwynd 1 (Area A) was undertaken by Dave Bayley (Licence Ref. 10E0353) of Irish Archaeological Consultancy Ltd in November 2010. Chetwynd 1 was first identified during a programme of testing (Licence Ref. 09E0135) undertaken by Sheelagh Conran in October 2009. Area B was identified as having archaeological potential and as such ground disturbances were monitored. Nothing of archaeological significance was identified in Area B. The excavation has identified the site of two burnt mounds. The larger mound, which had been heavily disturbed by ploughing, was located centrally within the excavation area. Two associated rectangular troughs were recorded beneath the disturbed mound. One of the troughs (Trough 2) was radiocarbon dated to the late Bronze Age (903-811BC, UB 18108). To the south of the troughs was a large pit which may have acted as a cistern. The pit was also radiocarbon dated to the late Bronze Age (832? 788BC, UB 18110). A series of stake-holes extended from the pit/cistern, possibly representing a small fence or windbreak. The clustering of stake-holes indicates that the fence was possibly re-erected a number of times. The second burnt mound was located to the north-west of the first mound and was only partially exposed within the excavation area. A radiocarbon date from charred barley grain recovered from the disturbed mound returned a medieval date (AD1303-1410, UB 18109). The mound was, however, heavily truncated by early modern land reclamation and it is interpreted that the dated grain sample may have been intrusive, such that the corresponding date is considered unlikely to correspond to the true date of the burnt mound. Similar dating has been returned from a barley seed from a nearby site at Garranedarrragh 1 (10E352) located 250m to the north-east, which indicates the potential for medieval activity in the area. However, the second burnt mound was located adjacent to a natural hollow which was infilled with silts possibly as post-medieval/modern land reclamation from which post-medieval pottery was noted. Similar pottery was recovered from the overlying burnt mound deposit associated with the larger burnt mound site, indicating that the site had been subject to intensive agricultural activity and disturbance in the last century. It is interpreted that this disturbance is the source of the intrusive charred seeds. The late Bronze Age burnt mound recorded at Chetwynd 1 is a site of local importance as it represents the first evidence of prehistoric activity in the immediate vicinity. The location of this site type adjacent to a river is not unexpected and the identification of features in the form of troughs and pits are often associated with these sites. Burnt mounds are known to be sites where hot water was generated by means of immersing fire-heated stone into troughs of cold water. What the hot water was used for, however, continues to be a subject of much debate. NOTE: TO DATE WORK ON THE N71 CHETWYND VIADUCT ROAD SCHEME HAS YET TO BE CARRIED OUT.