A series of maps under this heading has been produced at the detailed scale of 1:25,000 of areas of outstanding geological interest. Some areas are accompanied by explanatory booklets. The first booklet was produced in 1978 (Capel Curig and Betws-y-Coed) and the series is still current with the latest produced 2006 on the Glencoe Caldera Volcano, Scotland. These booklets describe the background geology of local areas of particular scientific interest allied to a 1:25,000 map and are of general appeal to the amateur geologist, student or professional. They are aimed at the more popular end of the market and are issued intermittently.