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| Eurypterus lacustris 2 |
| Most eurypterid remains are fragmentary and, apparently, resulted from storm-generated deposition of marine animals and arthropod molts into shallow lagoons of higher-than-normal salinity.. |
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| Eurypterus lacustris |
| Well-preserved carapaces of this form. The upper specimen (-). The lower (+) is 4.5 cm. width at base. |
| ABOVE: Peculiar preservation of part of the anterior of a specimen of Eurypterus lacustris. Note the operculum in the center with the medial sex appendage. Part of the swimming leg is preserved below the operculum. At the top, note a coxa, and swimming leg, and part of a walking leg, Late Silurian Williamsville Formation, Niagara Peninsula, Ontario, Canada. Eurypterus lacustris occurs over a wide geographic area of Western New York and Ontario. |
| CIURCA |
| One of the most important localities for the Eurypterus lacustris Fauna was the Bennett Quarry in Buffalo, New York. Specimens from this site are in museums around the world. Check out : BENNETTS QUARRY |
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| Anterior portion of a nearly complete Eurypterus lacustris revealing the spinose legs extending from the carapace. Specimen 040702-1 recovered from Williamsville Waterlime just before the rock was to be sent to the rock crusher. Niagara Peninsula, Ontario, Canada, April 2002. In front of the eyes, the dorsal cov- ering is torn away, revealing the ventral appendages. This specimen was collected from a layer not normally reached during usual collecting. The specimen was found just 8 cm. above the underlying Scajaquada Formation. At this quarry, the entire Bertie Group is usually exposed. Two eurypterid zones are present: Eurypterus remipes Biozone and the Eurypterus lacustris Biozone. |
| CIURCA 040702-1 |
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| AT RIGHT: Specimen I collected October 25, 2002 (ie. 102502-1). Eurypterus lacustris from near the top of Williamsville A Waterlime at the Ridgemount Quarry South on the Niagara Peninsula, Ontario, Canada. A) Right swimming leg turned on edge. B) Left swimming leg turned on edge. C) The poster- ior portion of the eurypterid turned back on itself and covered with sediment. But note at D) The tel- son reappearing. Evidently, this eurypterid was violently deposited into the fine-grained dolomitic mud that was forming during this Late Silurian time. Many specimens are found in this condition, as well as abundant disarticulated parts and indicate that the eurypterids that occur here represent a tempestite. That is, all remains were depos- ited by storms and introduced into the site of deposition. |
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| Eurypterids.net COPYRIGHT 2002 Samuel J. Ciurca, Jr., Rochester, New York |