- Plummers Island, in the Potomac River, near Cabin John1
- Quebec1
- Rockey Mountains, Glacier National Park, McDonald Creek1
- Rockport, bed of stream1
- Rocky Mountains, Glacier National Park, Hudsonian zone, on east side of Swiftcurrent Pass1
- Rocky Mountains, Glacier National Park, Lake McDonald by Fish creek1
- Rocky Mountains, Glacier National Park, appekunny argillite cliff on Mt. Henkel1
- Rocky Mountains, Glacier National Park, on slope of Altyn Peak1
- Santa Monica Range1
- Sevier1
- Silver River, 5 miles East of L'Anse1
- Slate Islands, Cove Island on south side of Patterson Island1
- Sonora1
- Story Brook1
- Strafford1
- Tennessee1
- Turquoise Lake, East side of Glacier Peaks, Mission Range1
- Tuscon, Station II [two], southward facing cliff of boulders1
- Val David, Terrebonne1
- Virginia1