Cauldron-like depressions called potholes are scattered around the upper reaches of the Black Rapids Glacier. They often fill with water over the summer, eventually draining on the surface or subglacially. They are left-over remnants of crevasses that formed during the 1936-1937 surge of Black Rapids. During the surge, the glacier terminus advanced by about 3 miles and earned the nickname the “galloping glacier”.
| Camera | Nikon NIKON D7000 (Current model NIKON D7500) |
|---|---|
| Lens | Sigma 17-50mm F2.8 EX DC OS HSM for Nikon (For Canon cameras) |
| Focal Length | 17.0 mm (25.0 mm in 35mm) |
| Aperture | f/13 |
| Exposure Time | 0.00156s (1/640) |
| ISO | 400 |
