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Coloured streaks on old quarry faces

Observed: 20th October 2011 By: bluebus52
quarryface1
quarryface1 1
Description:

mixed colours, mainly damp, smooth or sometimes granular. Some flat pink and grey lichens present. Obviously has resulted from water running down the face, sometimes seeping through higher layers. Is this chemical or biological?

Identifications
  • algae, slime, lichen
    Confidence: It might be this.
  • Iron stains
    Confidence: I'm as sure as I can be.
Species interactions

No interactions present.