アメリカ自然史博物館のインスタグラム(amnh) - 7月5日 06時04分

It's time for a Rocky Mountain Trilobite Tuesday! Whenever the trilobites of British Columbia are considered, images of the historic Burgess Shale and its world-renowned treasure trove of Middle Cambrian material naturally and rightfully spring to mind. That outcrop of the Stephen Formation stands as perhaps the most studied and lauded invertebrate fauna in paleontological history. However, this rugged, mountain-strewn province along Canada's Pacific Coast should also be recognized for a number of intriguing Lower and Upper Cambrian locations that sporadically appear throughout the entire region. Magnificent Olenellus and Wanneria specimens emerge from the area's oldest fossil-bearing rock -- the remote Rosella formation housing the former (also featuring such exotic species as Gabriellus kierkorum)… the Eager formation in Cranbrook (Mesonacis sp.) renowned for the latter. The Upper Cambrian is also well represented in BC, particularly by the diverse and prolific McKay Group, where trilobites such as Orygmaspis contracta and Housia canadensis (photograph) are often found in calcified geodes that produce beautifully detailed positive/negative examples. #trilobite #trilobites #trilobitetuesday #trilobitetuesdays #amnh #naturalhistory #amnh #rockymountains

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