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OUt at the park and they were having fun on this rock brought in by the glacier.
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Rock glaciers are distinctive geomorphological landforms, consisting either of angular rock
debris frozen in interstitial ice, or true glaciers overlain by a layer of talus. Rock
glaciers may extend outward and downslope from talus cones, glaciers or terminal moraines
of glaciers.[citation needed] There are two types of rock glaciers: periglacial glaciers,
or talus-derived glaciers, and glacial rock glaciers, such as the Timpanogos Glacier in
Utah, which are often found in the former places of glaciers. Possible Martian rock
glacier features have been identified by the Mars Orbiter spacecraft.
Little is known about rock glacier formation. The two known factors that must be present
in order to create rock glaciers are low ice velocity and permafrost. Most glacial rock
glaciers are created by the recession of debris covered glaciers. Glacial rock glaciers are
often found in cirque basins where rocky debris falls off the steep sides and accumulates
on ice glaciers. As the glaciers shrink, their composition changes as they become increasingly
covered with debris. Eventually, the glacial ice is replaced by ice cored rocks. With the
exception of ice-cored rock glaciers, rock glaciers are a periglacial process. This means
that they are a nonglacial landform associated with cold climates, particularly with various
aspects of frozen ground. Periglacial rock glaciers require permafrost instead of glacial
ice in order to form. Instead, they are caused by continuous freezing occurring within a
talus lobe. Rock glaciers may also have a mass wasting
or landslide origin, which does not require the presence of ice and suggests a sudden
catastrophic origin with little subsequent movement.