|I collected these speci- mens while on a field trip to examine some of the best Devonian and Carboniferous fossil plant sites in eastern North America. This work was supported, in part, by a grant from Sigma Xi.|
|PAGE BEGUN JULY 25, 2004, UPDATED MARCH 2007|
|While eurypterids are most notable in the Silurian rocks of New York State, certain forms appear to have evolved into the Devonian Period and have been recorded from strata at Gilboa, New York and the Devonian of Northern Pennsylvania. In most of these occurrences, eurypterids are associated with vascular plant remains and, eventually, it should be pobbible to construct a biostratigraphic framework similar to the one constructed for the Silurian and Early Devonian of the Northeastern United States. See Ciurca ....
To date, there is no more common eurypterid in the Devonian of the region than Erieopterus and the associated Acutiramus n.sp. However, as Middle and Upper Devonian rocks are examined more closely, I believe we will be able to elucidate a transgressive/regressive cyclic sequence of plant and eurypterid remains that will form the basis of a Devonian (eurypterid) biostratigraphy.
|ABOVE: Archaeosigillaria vanuxemii from rocks believed to be late Middle Devonian in age. Specimen collected at Schoharie Creek, Gilboa, New York in 1964 by the author. This is a great specimen of a lycopsid.|
|ABOVE: Grossopterus inexpectans from rocks believed to be late Middle Devonian in age. Specimen collected at Schoharie Creek, Gilboa, New York in 1964 by the author. The prosoma is preserved in sandstone - note the lateral eyes. From the 'Gilboa Forest' deposits. The reverse side of the specimen is covered with carbonized plant remains, perhaps the rootlets of the 'Gilboa Tree' Eospermatopteris, a tree fern (see at right)..|
|BELOW: The base of the Gilboa Tree, first thought to represent a seed fern. It is now generally accepted that the foliage of this tree is Aneurophyton, a well-known Devonian fossil plant. Eospermatopteris is the name used for the casts of the Gilboa Tree that were found at several levels at Schoharie Reservoir. Photos added March 2007.|