Beginning with the Geological Survey's first memoir De la Beche's 'Report on the geology of Cornwall, Devon and West Somerset' this series is composed of monographs on a particular geographic/geological region. Two district memoirs were published as part of De la Beche's serial publication started in 1844: Memoirs of the Geological Survey of Great Britain and of the Museum of Practical Geology. That is Geology of North Wales v. III (1866) and Geology of the London Basin v. IV (1872). All other District memoirs can be found in this series.