...Marcou further on calls the New Red Sandstone. The last sentence in the same paragraph reads thus: "Its thickness varies with the different localities...the bed ; nevertheless it may be said to vary from 500 to 2000 feet." Prof. Rogers estimates this rock in Pennsylvania with doubt at 1000 feet, and in...

...Wisconsin, Minnesota and Iowa. — Formation 1, a, 6, c, d, e, /, or lower sandstone ; Formation 2, a, &, c, or lower magnesian limestone, including the Galena...Petersburg presents the same structure, the same fossils, arid the same stratigraphic position. Of great extent in Canada, at Montmorency Falls ; in the State...

...Ungulites being " the most characteristic." " This Sandstone is sometimes calcareous," in which case " it is distinguished from Potsdam Sandstone by the...said to vary from five hundred to two thousand feet." This division of the Lower Silurian presents itself " of great extent" at the Falls of Montmorenci....

...Ungulites being " the most characteristic." " This Sandstone is sometimes calcareous," in which case " it is distinguished from Potsdam Sandstone by the...said to vary from five hundred to two thousand feet." This division of the Lower Silurian presents itself " of great extent" at the Palls of Montmorenci....

...case " it is distinguished from Potsdam Sandstone by the special name of Calr ciferous SandrocJc." " Its thickness varies with the different localities...said to vary from five hundred to two thousand feet." This division of the Lower Silurian presents itself " of great eitent" at the Falls of Montmorenci....

...Marcou further on calls the New Red Sandstone. The last sentence in the same paragraph reads thus: " Its thickness varies with the different localities...the bed ; nevertheless it may be said to vary from 500 to 2000 feet." Prof. Rogers estimates this rock in Pennsylvania with doubt at 1000 feet, and in...