A winter activity after the frost has broken up the ploughed or harrowed ground. The investigated area is divided into squares and the density of finds per square recorded and plotted on the map. See the reports below:
![Field walking at Quarrendon](https://bas1.org.uk/wp-content/uploads/2019/12/field-walking.jpg)
A winter activity after the frost has broken up the ploughed or harrowed ground. The investigated area is divided into squares and the density of finds per square recorded and plotted on the map. See the reports below: