Friedrich Schmidt, The Eurypterus beds of Oesel as compared with those of North America (1892)
“ In coming to America it was my wish to become more intimately acquainted with the different Silurian stages, and especially with those adjacent to the Waterlime group, i.e., with the Onondaga and Guelph limestones on the one side and the Tentaculite limestone on the other. It would perhaps be possible to find other connecting links in the development of life in both countries. ”
