Glacial deposition Flashcards

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1
Q

Drift

A

All glacial deposits

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2
Q

When does deposition occur?

A
  • When glacial ice melts

- When a glacier becomes overloaded with material

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3
Q

Till

A
  • Includes all material deposited directly by ice;
  • Till
  • Erratics
  • Drumlins
  • Moraines
  • Unsorted mixture of angular rocks, clay and sand that was mainly transported as supraglacial and englacial debris and then deposited
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4
Q

Types of glacial till

A
  1. Lodgement till

2. Ablation till

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5
Q

Lodgement till

A

Subglacial mixture that was deposited by the actively moving glacier
eg/ Drumlin

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6
Q

Ablation till

A

Produced at the snout when the ice melts

eg/ terminal, push and recessional moraine

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7
Q

Moraine

A

Type of landform that develops when the debris carried by the glacier is deposited

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8
Q

Lateral moraine

A

Moraine produced at the side of the glacier, rolled there from falling from top of ice or having fallen from the side (frost-shattering)

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9
Q

Medial moraine

A

Found at the confluence of two glaciers; two lateral moraines merged = form a deposit

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10
Q

Terminal/ End moraine

A

Marks the furthest point of the glacier, found at the snout.

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11
Q

Recessional moraine

A

Formed where the ice has retreated up the valley from terminal moraine and left a new pile of till

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12
Q

Push moraine

A

Forms when the ice has advanced down the valley and pushed materials ahead of it, leaving a ridge of moraine

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13
Q

Types of moraine

A
  • Lateral
  • Medial
  • Terminal/end
  • Recessional
  • Push
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14
Q

Glacial till fabric analysis

A
  • When plotting the data find the mid-point of the degrees

- Till fabric analysis suggest two possible orientations of the pebbles and suggest the origin.

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15
Q

Glacialfluvial material

A

Includes all the material deposited by meltwater streams

  • unsorted material deposited by meltwater streams
  • Sandur
  • Kames and kettle terraces
  • Eskers
  • Kettles
  • Braided streams
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