Thorne peat moor. .The Peat here has taken thousands of years to be laid down and was created as ice retreated after the last glaciation, leaving a flattened landscape, much of which is at or below sea-level. .Thorne Moors and Hatfield Moor are south of the Humber estuary and make up a total of 3,000 hectares of peat land. They are among the remnants of an extensive complex of lowland raised mires which started growing in the new landscape around 4,500 years ago..