Page:The Eurypterida of New York Volume 1.pdf/104

 brachiopods (, etc.) and the so called Ostergarn beds which still contain Eurypterus, but also ,  , Leperditia and in their uppermost layers species of Chonetes, Spirifer, Beyrichia, etc.

Thus the Eurypterus beds of the Salina formation in which the fauna reaches its climacteric development, are clearly stamped with their marine origin, and the profusion and perfection of preservation of the eurypterid remains precludes the possibility of their transportation into the basin by land waters; it is also apparent that the beds were not formed under normal marine conditions. The eurypterid horizons of Kokomo, of the Salina and of Oesel, as well as of Great Britain, exhibit as clearly all the characteristics of a particular and peculiar marine facies, as do the graptolites or the corals. These facies are indicated partly by the unusual nature of the rocks and partly by the peculiar aspect of the associated