Sometime between c. 3,600 and 3,300 BC, the small monuments and settlements gave way to a sequence of much larger and visually impressive earthwork monuments. The earliest of these may well have been a small “horseshoe shaped” earthwork enclosure (HE1), the entrance of which was aligned with sunset at the mid-winter solstice, as well as a potentially earlier group of timber posts. We can imagine the “horseshoe” monument holding a small group of people, perhaps the community leaders, who gathered together at mid-winter to hold ceremonies that involved solar observations. The material from the enclosure ditches suggests that the rest of the community may have taken part in feasting outside the enclosure. We can thus see how the community evolved the mechanisms for agreeing control and access to the landscape and its resources through increasingly elaborate ceremonies and architecture.
The ultimate expression of this architecture was in a series of huge linear cursus monuments, the largest, though not necessarily earliest, of which was the Stanwell Cursus. This remarkable monument ran in an almost straight line for 3 kilometres from the River Colne in the northwest to the edge of the Taplow gravel terrace beneath Stanwell in the southeast. It consisted of two parallel ditches, the earth from which was used to build a single central bank.
The monument appears to have been set out very precisely so that it linked together and buried a line of earlier important locations such as the burnt flint pits, posthole groups and settlements. It was built as a series of sections, each c. 150 to 200 metres long, and each section could have been built by four people working for 16 to 20 weeks, perhaps by particular family groups associated with the earlier location or monument that lay beneath the cursus. The construction of the cursus fulfilled many roles, but perhaps its most important legacy was that it affirmed through the construction of a communal project and through communal labour the pre-eminence of a community consisting of component families.
The architectural impact of such a monument would have been immense, but the social implications would have been even more far-reaching. The Stanwell cursus now served as a stage for the leaders of the community to process along and undertake ceremonies at the places along its course, which still remained sacred to the family groups. Underlying these ceremonies was a need to negotiate and agree access to land and resources in an increasingly cleared landscape. Thus the community had made itself and set itself upon a new course of social interaction that also included the construction of three other cursus monuments (referred to as the C2, C3 and C4 cursus), smaller in length though occasionally much greater in width.