The official BGS photographic archive contains an estimated 300,000 photographs. The archive has been built up systematically since its founding in 1891 and is becoming a very popular educational resource for images of the geology of the UK and overseas. A wide range of topics is represented: field geology, landscapes, oblique aerial photographs, geohazards, marine operations, fossil, rocks and photomicrographs of rocks and minerals in thin section. In addition there are an estimated 225,000 photographs held with former groups, projects and individual geoscientists. The collections hold a diverse range of photographic material which includes black and white or colour negatives, transparencies and prints. The film formats range from 35mm to 10"X8" which includes both film and large format glass plates.