|LEFT: An eurypterid from the Ukraine, Baltoeurypterus ?tetragonophthalmus, Silurian of the region Kamenezk-Podolskiy. This eurypterid occurs in windrows quite similar to those of the Bertie Group of New York State. All remains indicate that what we are viewing are accum- mulations of the molts via storm deposition. Remains are collected into windrows, current sorted accummulations of the re- mains of eurypterids and associated fauna. The specimen shown at left is 4.4 cm. long. Specimen courtesy of Alan Langheinrich (Langs Fossils).
Eurypterus-like eurypterids are also found in Pennsylvania, Maryland, England and also in the provinces of of Ontario and Quebec in Canada. Researchers are currently trying to work out the evolutionary (time) de- velopment of this group of relatively common eurypterids.