REVISION AND CORRELATION OF UPPERMOST SILURIAN STRATA IN NORTHEASTERN NEW JERSEY AND SOUTHEASTERN NEW YORK
In northwestern NJ and southeastern NY, the stratigraphic sequence for this interval consists of, from bottom to top, the Poxono Island, Bossardville, Decker Ferry, Rondout, and Manlius formations. In the area between Accord and Kingston NY, the stratigraphic sequence consists of, from bottom to top, the High Falls, Binnewater, Rondout, and Manlius formations. Confusing stratigraphic issues include the members of the Rondout Fm. between NJ and NY, where strata traditionally referred to the lowermost Manlius Fm. in the Hudson Valley area of NY are included within the uppermost Mashipacong Mbr. in NJ.
Herein it is proposed to geographically extend the term Poxono Island Fm. north to the vicinity of Kingston to include all of the strata between the Shawangunk Fm. and the Rondout Fm., with various preexisting formation-level units in this interval transferred to the member level within the Poxono Island Fm. This is proposed in order to redefine the Poxono Island Formation as an allostratigraphic unit comprising the facies mosaic of time-equivalent units between the Shawangunk and Rondout formations. Additionally, it is proposed to transfer the uppermost strata of the Mashipacong Mbr. to the Manlius Fm. and to apply the name Mashipacong only to the lowermost strata of the Manlius Fm. in NJ and extend it north into NY. Further discussion of stratigraphic revision within the lowermost Manlius Fm. and regional correlation will be included. It is hoped the revisions suggested herein will act to simplify, not further confound, our understanding of this interval.