The monument is situated approximately 2km north of the village of Thrussington on the west side of Ox Brook. It includes the earthwork and buried remains of a monastic grange associated water control features and an area of ridge and furrow cultivation.
The grange at Thrussington belonged to the Gilbertine priory at Sempringham in Lincolnshire and occupies a roughly rectangular area. It is bounded on three sides by 5m wide ditches and on the fourth eastern side by a former course of Ox Brook. The course of the brook has altered over the years and now lies further east. In the north western part of the site the boundary ditch is not visible on the ground surface but will survive as a buried feature. The area thus enclosed measures approximately 300m east west and 140m north south The grange can be divided into two parts the eastern part which forms the core of the grange and includes levelled terraces and a number of building platforms and the western part which includes a number of enclosures defined by a series of boundary banks and ditches. In the north eastern part of the site are the remains of two terraces the western one is well defined and is occupied by two raised building platforms whilst several hollows are visible within the eastern terrace. Slight earthworks on the surfaces of these terraces are thought to indicate the position of buried features. The eastern part of the grange is considered to have included the monks domestic accommodation probably a chapel and several agricultural buildings. In the western and southern parts of the monument a number of enclosure banks and ditches and further terraces are visible. The defined enclosures or paddocks provide evidence for the agricultural activities of the grange. One enclosure situated in the south western part of the grange is bounded by a bank and ditch along its northern western and eastern sides and by the grange?s boundary ditch to the south. It measures approximately 65m square and retains evidence of ridge and furrow cultivation. A further enclosure is visible beyond the southern boundary ditch. It has a linear plan and is bounded along its northern side by the southern boundary ditch and by a slight bank to the south. This enclosure appears to overlie an area of ridge and furrow visible to the south of the grange and is therefore considered to be later in date than the ridge and furrow. Adjacent to the north east and south of the grange are the earthwork remains of ridge and furrow cultivation which are aligned east west. These remains provide evidence for the land use beyond the boundary ditches of the grange and are thought to be contemporary with the occupation of the monastic grange. The ridge and furrow to the south extends southwards for approximately 40m and is included in the scheduling. A 26m wide sample area of that to the north east is also included in order to preserve the relationship between the monastic grange and the ridge and furrow. Approximately 50m to the north east of the grange is a retaining bank which has been constructed across the channel of the Ox Brook. The pond formed behind this bank now dry would have originally served as a supply pond of some extent. A 10m wide sample area of the floor of the pond is included in the scheduling. Immediately to the south west of the retaining bank is a levelled platform which is believed to include the buried remains of a watermill associated with the monastic grange. The pond would have originally provided the water supply to drive the mill?s water wheel. The platform has been overlain by later ridge and furrow cultivation which is in turn partly overlain by a modern farm track. The bridge across the northern boundary ditch the surface of the farm track and all fence posts are excluded from the scheduling although the ground beneath these features is included.