| A close look at the blocky, thick-bedded Sterling Quartzite on the north side of Johnson Canyon; the quartzite accumulation is a heat-pressure altered sandstone that was deposited in a Precambrian sea roughly 600 million years ago. |
| A close look at the blocky, thick-bedded Sterling Quartzite on the north side of Johnson Canyon; the quartzite accumulation is a heat-pressure altered sandstone that was deposited in a Precambrian sea roughly 600 million years ago. |