Robert Clarkのインスタグラム(robertclarkphoto) - 12月27日 10時10分

The trilobites, were among the first fossils that I ever saw, I grew up in Western Kansas. For those who are unaware, Kansas was once a vast interior sea, covered for Most of the #Permian rocks in Kansas were deposited in marine environments. This setting was home to algae, brachiopods, bryozoans, fusulinids, ostracods, pelecypods, and #trilobites.
Above is a trilobite.
For the last 70 million years of the Cretaceous period, Kansas was covered by a shallow sea. This body of water is known as the Western Interior Sea. The seafloor was smooth and probably never submerged by more than 600 feet of water. A great diversity of invertebrates flourished both on the bottom and in the water column. Examples include ammonites, giant clams, crinoids, rudists, and squid. Vertebrate life included bony fishes, mosasaurs, plesiosaurs, sharks, and turtles. Carcasses of dinosaurs like Niobrarasaurus coleii were occasionally preserved after drifting hundreds of miles out into the Seaway. Cretaceous plants left behind fossil leaves in Ellsworth County
My work with these fossils will be part of a book on the physical evidence of #Evolution. @ナショナルジオグラフィック

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