Before revision: There has been much debate on how these mud mounds were formed, one theory led to them being called reef knolls, knoll reefs,or bioherms but work in 1972 by Miller & Grayson explained their structure.One chain of mudmounds is found in the in the Bowland Sub-Basin of the Craven Basin, that has been dubbed the Clitheroe 'Reef' Belt .
After revision: There has been much debate on how the low micritic limestone hills in the Craven Basin were formed, one theory led to them being called reef knolls, knoll reefs,or bioherms but work in 1972 by Miller & Graysonidentified them as mud mounds with the same fossil content as those near WaulsortClitheroe reef belt .