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bedding plane

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angular unconformity

Overview page. Subjects: Environmental Science — Earth Sciences and Geography.

A discordant surface of contact between the deposits of two episodes of sedimentation in which the older, underlying strata have undergone folding, uplift, and erosion before the deposition...

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clint

Overview page. Subjects: Earth Sciences and Geography.

Joint-bounded surface unit of a hard, almost horizontally bedded limestone. The diameter varies typically from 1 to 2 m. It may be shallowly dissected by smooth gutters, or runnels, called...

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dip

Overview page. Subjects: Earth Sciences and Geography.

The angle of inclination of a rock down its steepest slope, that is to say, the direction at right angles to the strike. Dip is the angle between the maximum slope and the horizontal. A dip...

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fissile

Overview page. Subjects: Environmental Science — Earth Sciences and Geography.

1 The ability of certain rocks to be split along bedding planes.

2 See fissionable.

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Nereites

Overview page. Subjects: Earth Sciences and Geography.

A bilobed trail that winds over a bedding plane. The trail has a transverse ornament and was formed by a deposit feeder during its methodical search for food. The term ‘Nereites facies’ is...

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outwash

Overview page. Subjects: Earth Sciences and Geography.

1 The stratified sands and gravels deposited at or near to ice margins.

2 Meltwater escaping from the terminal zone of a glacier. The resulting streams...

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parting lineation

Overview page. Subjects: Earth Sciences and Geography.

A series of parallel, linear, low-relief ridges and hollows, spaced a few millimetres apart, seen on bedding planes in parallel-laminated sandstones. The lineation is the preserved trace of...

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percolation

Overview page. Subjects: Environmental Science.

The downward movement of water (soil moisture) within a soil, through the soil horizons, under the force of gravity. This water may eventually pass into the underlying bedrock and become...

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rockslide

Overview page. Subjects: Earth Sciences and Geography.

A landslide made up of fragments and blocks of rock (slide-rock), and which is typical of steep slopes. The failure unit may consist of the weathered zone, when the form of the unweathered...

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schist

Overview page. Subjects: Earth Sciences and Geography.

A metamorphic rock, characteristically with broad, wavy bands, which are not bedding planes, but sorted zones of minerals such as mica. Schists form from the metamorphosis of slates and...

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