Cup-marked boulder, Knott Hill, Marwood Parish, Barnard Castle (Marwood) - Source of Reference
| No. | Originator(s) | Date | Title | Notes |
|---|---|---|---|---|
| 1 | Brown, P | Nov-1995 | Marwood, Cup and Ring Stone | Colour print |
| 2 | Scheduled Monument/Monuments Protection Programme (MPP) Files | SM 31822 | ||
| 3 | Durham County Council, Northumberland County Council | 2005 | NADRAP Durham Box File 2 | Rock Art ID # 986 |
| 4 | 1998 | Monuments Protection Programme (MPP) County Durham Accelerated Scheduling Programme Folder: Area 6 Eggleston Abbey / Marwood | AI no: 148748 Date of Visit: 10/01/98 |