Scree Talus And Boulder Fields
Overview
Scree, talus, and boulder fields are collections of loose or semi-stable rock fragments that accumulate on slopes and valley floors, creating distinct footing and route-finding challenges for hikers.
Key points
- Rock size varies from small, shifting pieces to large, stable blocks.
- Footing can be uneven and may require slower, more deliberate movement.
- Trail lines may be marked with cairns, paint, or posts rather than constructed tread.
- Rockfall history and ongoing movement shape the character of these slopes.
- Weather, moisture, and freeze-thaw cycles influence rock stability over time.
Details
Scree and talus slopes form where rock fragments break off from cliffs or ridgelines and accumulate downslope. Scree typically refers to smaller, more mobile rock pieces, while talus often indicates larger blocks, though usage can vary. Boulder fields contain substantial rock blocks with gaps and voids between them.
Hiking across or along these features usually involves careful placement of each step. In fine scree, rocks may shift underfoot, while larger talus blocks may feel more stable but require stretching or stepping over gaps. Wet, icy, or snow-covered rocks can be particularly slippery.
Formal trail construction in extensive talus can be difficult, so routes are often indicated with cairns, posts, or paint markings on rocks. Visibility of these markers may change with snow cover, lighting, or vegetation growth, making attention to the overall line important.
Rock stability depends on many factors, including slope angle, underlying geology, and weather. Freeze-thaw cycles, water flow, and natural erosion can lead to occasional rock movement or rockfall. Land managers may assess and manage objective hazards along popular trails where feasible.
This article offers a general overview of scree, talus, and boulder environments. It does not provide technical climbing guidance or instruction for travel on steep or exposed rock, which require separate skills and training.
Related topics
- alpine-and-high-elevation-environments
- canyons-gorges-and-slot-features
- glaciated-landscapes-non-technical-travel
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Illustrative hiking footage
The following external videos offer general visual context for typical hiking environments. They are not official route recommendations, safety instructions, or planning tools.