Samuel J. Ciurca, Jr.
Thursday, May 16, 2002 12:54:54 AM
Eurypterid horizons are well-known from the Silurian sequence of New York and
Ontario, Canada. Several new horizons reveal other eurypterid occurrences in
what is a cyclic sequence of "waterlimes." Waterlimes are very fine-grained
dolostones with an admixture of clay and silica and which bear the eurypterid
faunas. Post-Akron Formation units like the Moran Corners Waterlime, bear a new
Eurypterus Fauna, and extend the cyclic sequence of eurypterid-bearing
waterlime units. Above this, Early Devonian euryperid faunas(Erieopterus)occur,
cyclically, within the Chrysler and Manlius Formations. In summary, there is a
lot more to the eurypterid occurrences of the Siluro-Devonian sequences than
has previously been realized. The New York State Geological Association meeting
in Lake George, New York, in September 2002, will have a fieldtrip to
localities that exhibit several of the stratigraphic sequences of the state
that display eurypterid horizons.