... H. Chadwick to the effect that the Thorold sandstone at Rochester is not of Thorold age and should be designated as the “Kodak.” The following consideration of Professor Chadwick’s views indicates that the addition of another term to the already overburdened nomenclature of the region may...

...George H. Chadwick The true Thorold sandstone, if present at Rochester gorge and Glen Edyth, as seems inevitable, has become wholly red and is the 7-foot top bed of the red Medina there, the bed that carries Arthrophycus , with the “gray band” sharply disconformable above it in the gorge...

...Beverly Seyler; Mark A. Pearce Abstract The basal Silurian Medina Group including the Whirlpool Sandstone, Power Glen Shale, Grimsby Sandstone, and Thorold Sandstone was studied in the outcrop belt along the Niagara escarpment from St. Catharines, Ontario, east to Rochester, New York...

... 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...

...W. J KILGOUR Abstract A new interpretation of Silurian Lower Clinton relationships observed in the area between Medina, New York, and Clappison's Corners, Ontario, is presented. The Lower Clinton Group in this area is considered to include those units between the Thorold Sandstone...

...I. P. Martini Abstract Directional data obtained from sedimentary structures and grain orientations suggest that two major paleocurrent systems exist in the Thorold and Grimsby Sandstones (Silurian) along the Niagara Escarpment (Ontario and New York State). The two systems are documented...

...Fig. 5. —Regional variations in modal compositions for ( a ) Thorold Sandstone; ( b ) upper half of Grimsby Sandstone Member; ( c ) lower half of Grimsby Sandstone Member. (R.F. = Rock Fragments.) ...

... sedimentary structures, were studied in the Thorold and Grimsby Sandstone Members of the Medina Formation. Determination of grain orientation yielded a complex pattern of directions hardly explainable except by a “mixed environment” model. It was found that the total sampled population of the grain...

... (1840 , pp. 434–35) used the name Medina for the same interval; this automatically included what we to-day refer to as the Queenston red shale and all the beds up to the base of the Thorold sandstone (Oneida). 1 Manuscript received, February 10, 1954. 2 Senior paleontologist...

.... The detailed section of the Albion at Niagara Falls as given by Kindle and Taylor 3 is as follows. Albion sandstone Feet Sandstone, gray, massive, somewhat cross-bedded (Thorold sandstone member, the “gray band”)…………. 5 Sandstone, red and gray mottled, cross-bedded throughout but seen...

...I. P. Martini Abstract The analysis of quartz grain orientation in a set of 261 thin sections obtained from the Thorold and Grimsby Sandstones (Silurian, S.W. Ontario and New York State) indicates that: (1) The number of measurements needed for a petrographic analysis of grain orientation varies...

... the completion of the regressive phase of the Cataract sedimentation cycle. Accordingly, the Thorold sandstones would represent the initial deposit of the Clinton sea in Ontario. A concentration of phosphate pellets and the brachiopod Hyattidina congesta (Conrad) in the “older” Reynales of the Niagara Gorge...

... - Manitoulin Island area . The Thorold Sandstone was later assigne d to the Cataract Group of the Alexandrian Series (Kilgour, 1963 ; Berry and Boucot, 1970) . Thus the Niagaran Series south of the Algonqui n Arch began with the Neahga Shale ; whereas north of the arch it bega n with the Fossil Hill Formation...

...Fig. 3. Grimsby Formation, Hamilton, Ontario. (A) View facing south of concave cliff at Princess Falls exposing variegated Grimsby Formation (recessive lower two-thirds of cliff) overlain by Thorold Formation (resistant one-third at the top). Apparent thickness is somewhat misleading because...