ナショナルジオグラフィックのインスタグラム(natgeo) - 3月12日 00時40分

Mt. Stephen Trilobite Beds, Yoho NP. Photo by @peteressick on assignment for @ナショナルジオグラフィック. I am heading back to Yoho NP tomorrow to do some winter photography. This picture of the trilobite beds in the Burgess Shale is an important one from the fall shoot. Stephen Jay Gould called the fossils in the Burgess Shale the "most important fossils in the world," and wrote a whole book about them called "Wonderful Life." The fossils are from 505 million years ago, a time known as the Cambrian explosion when multicellular life really took off. There are just four phylum of arthropods that survives from the Cambrian era - Chelicerates (spiders, scorpions, etc.), Crustaceans (lobsters, crabs), Myriapods (millipedes, centipedes), and Hexapods (insects). However, fossils of 24 phylums of arthropods have been found in the Burgess Shale, comprising some very unusual life forms. There is Opabina with five eyes, Dinomischus, a filter feeder that looks more like a flower and even a creature called Hallucigenia with lots of spikes. At Mt. Stephen there are lots of trilobite fossils on the ground, but the really unusual fossils are appropriately in museums. Most evolutionists believe that during the Cambrian era, life was free to evolve into various forms because everything was so new. As certain forms became more advantageous, they could dominate over others. So we tend to think of early life being less diverse, but that was not the case according to the fossil evidence.

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