What is hummocky terrain?
Hummocky terrain is composed of tracts of hillocks and depressions of variable size and shape, and occurs in areas that have been glaciated.
What produces hummocky topography?
The most common explanation for the formation of hummocky topography, is that a thick cover of supraglacial moraine on top of a stagnant ice at the ice‐margin was let down as the ice melted (Johnson & Clayton, 2003, Boulton 1972).
What is a hummocky moraine?
hummocky moraine A strongly undulating surface of ground moraine, with a relative relief of up to 100 m, and showing steep slopes and deep, enclosed depressions. It results from the downwasting (i.e. thinning) of ice which is usually stagnant.
What are glacial hummocks?
An ice hummock is a boss or rounded knoll of ice rising above the general level of an ice-field.
What are hummocks made of?
(1) [sea ice] a smooth hill of ice that forms on the sea ice surface from eroding ridges, particularly during the summer melt; the formation of hummocks is similar to young mountain peaks with steep slopes that erode into smooth, rolling hills.
How does hummocky cross stratification form?
Hummocky cross-stratification is a type of sedimentary structure found in sandstones. It is a form of cross-bedding usually formed by the action of large storms, such as hurricanes. It takes the form of a series of “smile”-like shapes, crosscutting each other.
What is hummocky topography quizlet?
hummocky topography. What causes soil creep? barely predictable, non-accelerating downslope movement. Caused by the expansion and contraction of soil as a result of heating and cooling, freezing thawing or wetting and drying.
How are outwash plains formed?
Outwash plains and eskers form due to the flow of meltwater in front of (outwash plains) or beneath (eskers) that glacier ice. They are composed of glacial sediments that have been reworked by flowing water.
How are hummocky moraines formed?
When a debris-covered snout melts over time material is gradually let down from the ice surface to produce an area of ‘hummocky moraine’.
What is hummocky hills in geography?
geology, a hummock is a small knoll or mound above ground. They are typically less than 15 meters (50 ft) in height and tend to appear in groups or fields. An extremely irregular surface may be called hummocky.
How are hummocks formed?
Hummocks initially form by extensional faulting as a landslide begins to move. During motion, individual large blocks develop and spread, creating an initial distribution, with small hummocks at the landslide front and larger ones at the back. As the mass spreads, hummocks remain as discrete entities.
Where does hummocky cross-bedding form?
It is a form of cross-bedding usually formed by the action of large storms, such as hurricanes. It takes the form of a series of “smile”-like shapes, crosscutting each other. It is only formed at a depth of water below fair-weather wave base and above storm-weather wave base.