Two palaeontologists working on the world-renowned Burgess Shale have revealed a new species, called Mollisonia plenovenatrix, which is presented as the oldest chelicerate. This discovery places the origin of this vast group of animals -- of over 115,000 species, including horseshoe crabs, scorpions and spiders -- to a time more than 500 million years ago.

ScienceDaily.com (Date:09/11/2019 21:17) Read full article >>

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Shale: Shale is a fine-grained, clastic sedimentary rock composed of mud that is a mix of flakes of clay minerals and tiny fragments of other minerals, especially quartz and calcite. The ratio of clay to other minerals is variable. Shale is characterized by breaks along thin laminae or parallel layering o