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Topic 2 geo > Moraines > Flashcards

Moraines Flashcards

1
Q

What is a moraine

A

accumulation of till lodgement,

whether dumped by an active glacier or left behind as a deposit after glacier retreat

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2
Q

Two types of moraines

A
  • Subglacial: Moraines formed beneath glacier

- Ice-marginal: Formed along margins of a glacier

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3
Q

Land formation subglacial moraines can form

A

DRUMLINS
Moraines are primarily composed of lodgement till

In some places beneath active glaciers, lodgement till is moulded into streamlined mounds called drumlins

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4
Q

Land formations ice-marginal moraines can form

A

Lateral Moraine (linear)

Medial Moraine (linear)

Terminal or end moraine (linear)

Recessional Moraine (linear)

Push Moraine (linear)

Hummocky or Disintegration Moraine (non-linear

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5
Q

Lateral Moraine (linear) Appearance

A

A ridge of till deposited along valley floor edge

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6
Q

Lateral Moraine (linear) Formation

A

Debris from freeze-thaw weathering of valley side falls onto glacier

Transported and deposited at edge of glacier when it melt

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7
Q

Medial Moraine (linear) Appearance

A

A ridge of till deposited down middle of valley floor

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8
Q

Medial Moraine (linear) Formation

A

two lateral moraines converge towards each other combining to form a medial moraine.

Ice flow is parallel to each other

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9
Q

Terminal or end moraine (linear) Appearance

A

High ridge of till extending across valley at right angles to valley side

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10
Q

Terminal or end moraine (linear) Formation

A

Till deposited at max extent of a glacier, especially

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11
Q

Recessional Moraine (linear) Appearance

A

Lower ridge till across valley, parallel to terminal moraine

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12
Q

Recessional Moraine (linear) Formation

A

till deposited during interruptions in retreat of glacier ice

When glacier remained stationary long enough for a ridge of material to build up

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13
Q

Push Moraine (linear) Appearance

A

Ridge of moraine with stones tilted upwards

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14
Q

Push Moraine (linear) Formation

A

Any morainic material at glacier snout will be pushed forward during advance.

Faster the velocity of advance, steeper angle of tilt or stones.

Transverse to ice flow

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15
Q

Hummocky or Disintegration Moraine (non-linear) Appearance

A

Chaotic jumble of till mounds

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16
Q

Hummocky or Disintegration Moraine (non-linear) Formation

A

Originally considered a product of ice stagnation and dropped from a debris-rich, now associated with active glacial retreat.

Limited orientation

Topic 2 geo (40 decks)

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