Pillow Lava - Use As A 'Way-up' Criterion

Use As A 'Way-up' Criterion

Pillow lavas are used as way-up criterion in geology. There are three key ideas that can be used as part of this, and that a pillow lava will show if it is the correct way-up:

  1. Vesicles will be found towards the top of a pillow as the gas will be less dense than the surrounding rock.
  2. The pillow structures will show a convex upper surface.
  3. The pillows will have a tapered base downwards as they have moulded to the underlying pillows during their formation.

Read more about this topic:  Pillow Lava

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