A distinctive style of rock art found in the Kimberley region of Western Australia. Named after Joseph Bradshaw who was the first European to discover them in 1891, whilst searching for grazing land for his cattle. The Aboriginal term for these paintings is Gwion Gwion. Archaeologists estimate that there may be more than 100,000 sites spread over 50,000km of the Kimberley. In 1996 one of the paintings was dated by thermoluminescence [see thermoluminescence] analysing an ancient wasp nest covering it. The nest was found to be over 17,000 years old, indicating that some paintings are at least this old. However, because it has been proven that Australia was colonized as early as 65,000 years ago, some argue that these paintings are possibly much older, and possibly the earliest figurative rock art.