...Mark A. Pearce; Beverly J. Seyler Abstract The gas-bearing sandstones of the Medina Group in western New York are the basal Whirlpool Sandstone and the Grimsby Sandstone. Toward the west, these are separated by the Cabot Head Shale and the Manitoulin Limestone. Farther east, the Grimsby overlies...

... dolomite, followed by a longer regressive history represented by the deposition of the Cabot Head shale and the Grimsby sandstone. Continental sedimentation occurred during lower Whirlpool deposition and upper Grimsby deposition. The change from transgressive to regressive tendencies is marked...

... is stray Clinton. These subunits have been correlated by others, respectively, as the Cabot Head Shale, the Grimsby Sandstone, and the Thorold Sandstone of western New York. The sandstones and siltstones are generally tight and highly cemented by pervasive secondary silica. Original depositional clay...

... by the Whirlpool Sandstone and the overlying Cabot Head Shale. The thickest sandstones, and most important hydrocarbon reservoirs, are in the Grimsby Sandstone, which is interpreted as a highstand systems tract with basinward-prograding deposits formed during a normal regression. Three major de-positional systems...

... subsurface cores that span the complete Llandovery interval. The Llandovery succession of the Michigan Basin measures between 140 m and 265 m thick and is represented by three lithostratigraphic groups: the Cataract (Manitoulin formation and Cabot Head Shale), the Burnt Bluff (Lime Island, Byron...

..., and Cabot Head Shale thickness. The Whirlpool Sandstone Member was not included in this analysis. No statistical correlation was found between the above variables and estimated-net gas reserves. Visual inspection reveals trends common to the isopach maps and estimated-net gas reserves. Thus, stratigraphic...

... core (δ 13 C carb data). am. — amorphognathoides ; C. H.—Cabot Head Shale; Con.—Conodont; Fm.—Formation; Litho.—Lithology; Pt. — Pterospathodus . ...

...Fig. 11. Selected core samples of Cabot Head Shale, White Clinton, and Red Clinton. Scale is in inches. Numbers are depths in feet. Same well as Figures 10 and 13 . ...

... of these localities. Yet these are the strata which Fisher claims to be consistently present and which he would use to separate the Fish Creek from the Cabot Head. The writers contend that because the Manitoulin is not consistently present eastward they have no recourse but to group the shales between the top...

... acres; it is being drilled actively. Total initial oil production amounted to more than 2,500 barrels per day. The only source rocks adequate to provide the hydrocarbons that fill the scattered reefs in the Silurian section are the underlying shales, the Clinton and Cabot Head, of Middle and Early...

... and chlorite formation probably altered water composition during interaction with shales of the Cabot Head formation and within the Clinton. Minor constituents of the waters appear to be controlled by reactions with clays. 1 Manuscript received September 14, 1987; revised manuscript received January...

... possibly Llandovery. Lunataforma parallela sp. nov. was recovered from a sample of the Cabot Head Shale from 19 ft (6 m) above the top of the Manitoulin Dolomite, Wentworth County, Ontario, Canada ( Figure 1 ; Appendix 1 ). The Cabot Head Shale is interpreted as an open marine unit (Sanford et al...