Cariou uses a specific medium of petroleum and sunlight in his photography “Petrography is literally petroleum-photography: the creation of images through the interaction of sunlight and the heavy petroleum product known as bitumen, which is the main source of the vast supplies of oil in Canada’s Athabasca tar sands region”. References Canadian literary critics Canadian male short story writers Living people People from Meadow Lake, Saskatchewan Canadian people of Breton descent 20th-century Canadian short story writers 21st-century Canadian short story writers 20th-century Canadian male writers 21st-century Canadian male writers Canadian male non-fiction writers Year of birth missing (living people) 20th-century First Nations writers 21st-century First Nations writers First Nations academics First Nations artists