Marks Dale is a small dry valley running west from the Via Gellia. It contains the remains of a number of small-scale mine workings whose names, like many others in the area, have now been lost. The surface remains are described in PDMHS Newsletters 120 (Roger Flindall 2006)) and 124 (John Barnatt et al 2007). Jim Rieuwerts in Part 4 of Lead Mining in Derbyshire (page 85) refers to a sough draining the Griffe mines into an underground swallow likely to be beneath Marks Dale. As the article by Barnatt et al refers to three deep open shafts on the north side of the dale it was thought to be worth a look with a view to gaining access to the sough. Unfortunately the shafts, plumbed via a Bosch PLR30 laser measurer, proved to be quite shallow and unlikely to lead to workings of the required depth.