Plainsfield Camp (or Park Plantation) is an Iron Age earthwork on the Quantock Hills near Aisholt in Somerset and is a Scheduled Ancient Monument.
However there is some difference of opinion as to whether or not this is simply an animal enclosure rather than a hill fort or promontory fort. Plainsfield Camp is situated on a spur of a hill and does have steep slopes on two sides which would have defensive qualities but the hill behind the ‘fort’ rises over 50 metres above the ring. It has a single rampart with ditch, a simple opening for an entrance and is quite small with an internal area of only 0.9 ha. (or 1.2 ha - see below)
The site is shown on an estate map of 1610, the area was enclosed in the mid 17th century and may have been emparked following this, as in 1838 it is referred to as Plainsfield Park.
The following archaeological report was found on the www: (author unknown)
The earthwork remains of Plainsfield Camp, also known as Cockercombe Camp, lie on a north-east facing spur of land, at about 235m above OD. The enclosure sits within Park Plantation, an area of Forestry Commission managed woodland which forms part of the Quantock Forest. The enclosure is sub-rectangular in shape, enclosing an area of about 1.2 hectares, and comprises a rampart and external ditch, the latter now intermittent, with a maximum over all width of 14m. The rampart is comprised of stone and earth, 7-10m in width, and stands to a maximum of 3m on the down slope side. The ditch is most prominent along the south-western side where it survives to a depth of 1.2m and is 2m in width. There are 3 breaches in the circuit, 2 on the north-eastern side and one in the southern corner, the latter of which can be seen to clearly cut the rampart. The break in the northern corner would appear to be contemporary and is possibly the original entrance. The breach at the centre of the south-eastern side has previously been recorded as the original entrance but close examination would suggest that it is possibly later in date. The interior has recently been cleared of trees and several features including a pillow mound (PRN 26766), 2 small pits and several slit trenches dating from the Second World War were recorded.
'Parkfield Camp' map from 1911
Plainsfield Camp by Somerset County Council 1982