It was not until the British discovery of the iconic "Charnia" that the pre-Cambrian was seriously considered as containing life. This frond-shaped fossil was found in England's Charnwood Forest first by a 15-year-old girl in 1956 (Tina Negus, who was not believed) and then the next year by a group of three schoolboys including 15-year-old Roger Mason. Due to the detailed geological mapping of the British Geological Survey, there was no doubt these fossils sat in Precambrian rocks. Palaeontologist Martin Glaessner finally, in 1959, made the connection between this and the earlier finds and with a combination of improved dating of existing specimens and an injection of vigour into the search many more instances were recognised.