The first Burgess Shale fossils were found on Mount Stephen in Canada's Rocky Mountains by a construction worker, whose reports of them reached Richard McConnell of the Geological Survey of Canada. McConnell found trilobite beds there in 1886, and some unusual fossils that he reported to his superior. These were misdiagnosed as headless shrimps with unjointed appendages, and were named Anomalocaris because of their unusual appendages – but turned out to be pieces of a puzzle that took 90 years to solve.