| New York State Geological Association Meeting of the New York State Geological Association (joint meeting with the NEIGC) September 27 - 29, 2002 Fort William Henry Motel & Conference Center, Lake George, New York HOSTED BY COLGATE UNIVERSITY http://www.nysgaonline.org |
| EURYPTERIDS: Commentary on the Occurrence, Stratigraphy, Sedimentology, Paleoecology and Distribution of the Silurodevonian Eurypterids in Upstate New York and the Niagara Peninsula of Ontario, Canada. Samuel J. Ciurca, Jr., Rochester, New York |
| The fieldtrip agenda included a number of stops to important eurypterid-bearing horizons. While all localities were not visited on this one-day trip, the remaining sites can be visited at anytime by interested individuals wishing to aquaint themselves with the wonderful stratigraphic sections afforded by roadcuts, quarries and natural outcroppings in New York. |
| Eurypterids: Central-Eastern New York Fieldtrip FIELD TRIP LEADERS Samuel J. Ciurca, Jr., and Joseph La Russa, Rochester, New York |
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| NYSGA 2002 |
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| Erieopterus microphthalmus (carapace at left) is one of the most abundant eurypterids occurring in a belt from near Albany, New York, westward to Haggersville, Ontario, Canada. This specimen (061401-1) was collected on June 14, 2002 while working on the roadlog for the 2002 NYSGA Fieldtrip. The specimen is from the Early Devonian Thacher Formation at Cherry Valley, New York, Stop 1 on the Fieldtrip Agenda for the 2002 meeting. Erieopterus also occurs in the Early Devonian of Ohio and Michigan. |
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| OSTRACODS At right is a portion of a slab of ostracodal limestone from the Thacher Limestone at Cherry Valley, New York. The Erieopterus carapace above was found in this (lelperditiid) ostrcodal limestone associated with many specimens of the clam, Megambonia. In this respect, the occurrence described is identical to the occurences of the typical Olney Limestone at Split Rock Quarry, Fairmount, near Syracuse, New York. Erieopterus is very abundant in the upper and lower Olney Member of the Manlius Group. The whitish portions exhibited in the photo to the right are mineralizatons (calcite?) replacing the interiors of the ostracods. Below the Olney Limestone, Erieopterus is very abundant in the Chrysler Formation, a unit consisting most- ly of dolomitic rocks. Stromatolites are commonly inter- bedded within the Erieopterus-bearing beds. |
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| ABOVE: A cluster of Tentaculites, CIURCA 093002-1, collected during the NYSGA 2002 fieldtrip from the Thacher Formation at Cherry Valley, New York. From the 'ribbon limestone' beds above one of the Erieopterus horizons. Note the associated ostracods. Tentaculites occurs in countless numbers within this unit. On this fieldtrip, two specimens (carapaces) of Erieopterus were found. BELOW: A small carapace of this Early Devonian eurypterid, CIURCA 093002-2,3. Note the very small eyes. |