Corn mills are often referenced in documentary evidence but excavations of these sites are very rare. A possible corn mill at Ashton on Mersey (GM) was investigated in 2010; the site was known from documentary evidence and exposed by water action. Timbers eroding from the river bank were subject to tree ring analysis, revealing a terminus post quem date of AD 1498 (Nayling 2010). Despite high water levels, the site was surveyed and revealed worked stone including a large fragment of mill stone. Although the site was not excavated, there is potential for further investigation.
A recent survey of windmills on the Wirral (M) noting the locations of around seventy mills dating from the Domesday survey to the modern era is now published (Patel 2016).