chalk) (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 6 (15115473009).jpg Uintacrinus socialis Grinnell, 1876 - fossil crinoids in chalk...
in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 9 (15115469629).jpg Uintacrinus socialis Grinnell, 1876 fossil crinoids in chalk from...
in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 5 (15115653328).jpg Uintacrinus socialis Grinnell, 1876 fossil crinoids in chalk from...
in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 8 (15279196066).jpg Uintacrinus socialis Grinnell, 1876 fossil crinoids in chalk from...
in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 3 (15115693187).jpg Uintacrinus socialis Grinnell, 1876 fossil crinoids in chalk from...
in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 7 (15115688847).jpg Uintacrinus socialis Grinnell, 1876 fossil crinoids in chalk from...
in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 4 (15279201036).jpg Uintacrinus socialis Grinnell, 1876 fossil crinoids in chalk from...
in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 1 (15115484550).jpg Uintacrinus socialis Grinnell, 1876 fossil crinoids in chalk (centimeter...
in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 2 (15115600808).jpg Uintacrinus socialis Grinnell, 1876 fossil crinoids in chalk (centimeter...
DescriptionChalk (Niobrara Formation, Upper Cretaceous; Great Plains, USA) 1.jpg English: Chalk from the Cretaceous of the American Great Plains. (outdoor...
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