Precarious boulder

Precarious boulder refers to a large rock or boulder resting either on the ground or on another rock in an apparently unstable position. This can arise by a few mechanisms:

  • Erosion may have removed the basal rock or sediment, leaving the boulder exposed
  • The rock may have been transported from an ice sheet and was left exposed when the ice retreated—this is more accurately called a glacial erratic
  • The rock may have been transported and placed at the location from a catastrophic geologic process, such as:

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