Preliminary geologic map and cross section of the Ellenville and Kerhonkson quadrangles (in part) and the Napanoch quadrangle, Ulster and Orange Counties, New York

Stratigraphy of Silurian rocks in Shawangunk Mountain, southeastern New York, including a historical review of nomenclature

“…The basal surface of the Shawangunk is irregular and has downward projecting structures described as mullions by Epstein and Lyttle (1987). The angular discordance with the underlying medium-gray (N5) to dark-gray (7V3) interbedded shale, siltstone, and fine-grained graywacke of the Martinsburg is less than 15° throughout most of the area, although it increases east of Ellenville (Epstein and Lyttle, 1987). This contact is exposed along U.S. Interstate 84 near Port Jervis ( fig.…”

“…Lesley commented that the Medina is predominantly sandstone at the bottom, much of which is ripple bedded, and shale at the top. He observed Epstein and Lyttle (1990) and J.B. Epstein (unpub. data, 1990).…”

“…These rocks form a northwest dipping homocline from Port Jervis to Spring Glen, northeast of which they are folded into a broad arch that extends to Accord. Beyond Accord, the rocks become highly faulted (Epstein andLyttle, 1987, 1990).…”

“…Epstein and Lyttle (1987) and Epstein (1989) (pi. IV) described the details of the stratigraphy of the Silurian rocks in southeastern New York and presented a facies model upon which much of this report is based.…”

“…IV) and Alcala (1990) presented sedimentologic and petrographic details of the Wurtsboro Tongue of the Bloomsburg Red Beds, Ellenville Tongue of the Shawangunk Formation, and High Falls Shale at Port Jervis, Wurtsboro, and Ellenville based on the stratigraphic framework of Epstein and Lyttle (1987). Epstein and Lyttle (1990) mapped the distribution of the Silurian siliciclastic rocks in the Napanoch, Ellenville, and Kerhonkson quadrangles.…”