Earthworks (Archaeology) in the context of "Scheduled Ancient Monument"

A hillfort is a type of fortified refuge or defended settlement located to exploit a rise in elevation for defensive advantage. They are typical of the late European Bronze Age and Iron Age. Some were used in the post-Roman period. The fortification usually follows the contours of a hill and consists of one or more lines of earthworks or stone ramparts, with stockades or defensive walls, and external ditches. If enemies were approaching, the inhabitants would spot them from a distance.

Prehistoric Europe saw a growing population. It has been estimated that in about 5000 BC, during the Neolithic period, between 2 million and 5 million people lived in Europe; in the Late Iron Age, Europe had an estimated population of around 15 to 30 million. Outside Greece and Italy, which were more densely populated, the vast majority of settlements in the Iron Age were small, with perhaps no more than 50 inhabitants. Hillforts were the exception, and were the home of up to 1,000 people. With the emergence of oppida in the Late Iron Age, settlements could reach as large as 10,000 inhabitants. As the population increased, so did the complexity of prehistoric societies. Around 1100 BC hillforts emerged and in the following centuries spread through Europe. They served a range of purposes and were variously tribal centres, defended places, foci of ritual activity, and places of production.

Offa's Dyke (Welsh: Clawdd Offa) is a large linear earthwork that roughly follows the border between England and Wales. The structure is named after Offa, the Anglo-Saxon king of Mercia from 757 to 796, who is traditionally believed to have ordered its construction, although modern archaeological evidence shows far earlier origins and its original purpose is debated.

It delineated the border between Anglian Mercia and the Welsh kingdoms (such as Powys) by the time of its completion, but when begun (carbon-dated to 430AD) it separated the Brytons of the Decangi, Cornovi and Dobunni from the Western Ordovices, Demetae and Silures.

A causewayed enclosure is a type of large prehistoric earthwork common to the early Neolithic in Europe. It is an enclosure marked out by ditches and banks, with a number of causeways crossing the ditches. More than 100 examples are recorded in France and 70 in Southern England and Wales, while further sites are known in Scandinavia, Belgium, Germany, Italy, Ireland and Slovakia.

The term "causewayed enclosure" is now preferred to the older term, causewayed camp, as it has been demonstrated that the sites did not necessarily serve as occupation sites.

In the United Kingdom, a scheduled monument is a nationally important archaeological site or historic building, given protection against unauthorised change.

The various pieces of legislation that legally protect heritage assets from damage, visual disturbance, and destruction are grouped under the term "designation". The protection provided to scheduled monuments is given under the Ancient Monuments and Archaeological Areas Act 1979, which is a different law from that used for listed buildings (which fall within the town and country planning system). A heritage asset is a part of the historic environment that is valued because of its historic, archaeological, architectural or artistic interest. Only some of these are judged to be important enough to have extra legal protection through designation.