then the upper Salina marls, with No. VI, finally outcropping just at the mill dam and near Tuscarora creek on S. 40° E. 50° dip.
The Oriskany measures seem to have been entirely eroded by Tuscarora creek here and for some distance west, which is true in a measure of the Lewistown limestone also.
An excellent section of the Ore sandstone group can be obtained on the road leading west from Port Royal where the base of the ridge is washed bare by Tuscarora creek about 2 miles from the river. The dip is S. 23 E. 35 and the section shows:
| Sand Vein fossil ore bed; not exposed. | |
| Ore sandstone, in thin beds; shaly, | 12′ 0″ |
| Blue shales, with hard SS. ridge, | 20′ 0″ |
| Ore ? ferruginous l. s., fine grained, | 2″ |
| Slate, blue, | 6″ |
| Ore ? ferruginous l. s., fossiliferous, | 4″ |
| Slate, | 2″ |
| Sandstone, | 4″ |
| Slate, | 1″ |
| Ore, hard fossil in blocks, lean, calcareous, | 2″ |
| Sandstone and slate, | 4″ |
| Ore, lean and siliceous, | 8″ |
| Slate and sandstone, | 1′ 0″ |
| Ore, hard fossil, calcareous, | 5″ |
| Blue slate, | 15′ 0″ |
| Ore, in square blocks; ‘‘Mud Vein?” | ½″ |
| Brown shale and sandstone, | 50′ 0″ |
| Variegated slates; blue, green and gray, | 40′ 0″ |
| Red slates. |
The Danville beds are here worthless, but the section is an interesting one. The Ore sandstone does not cross the creek, being seen again in a small run further west, making the bed of the old mill dam at the next cross roads.
Just west of this point the Tuscarora creek bends southward and flows across a plain of Salina rocks, nearly a mile wide to and into the Limestone ridge at J. Groninger’s, passing in and out of this same ridge west to the Beale township line. The ridge is low and broken here, but shows about 60′ of good limestone in a bluff at the Beale township
