Sunday, 31 March 2013
Tufa eggs for Easter, Matlock Bath, Derbyshire
Birds nest and eggs encrusted in tufa, Matlock Bath, Derbyshire. Photograph from the Geologists' Association 'Carreck Archive'
Original description: 'Tufa which also goes by the name of Travertin [Travertine] or Calcareous Sinter is a deposit of Carbonate of Lime thrown down by springs which flow through beds of limestone. In this case at Matlock these specimens are from lime obtained from the Carboniferous Limestone. The rain in passing through the atmosphere takes up Carbonic acid and assisted by humic acid from the soil when it sinks into the limestone dissolves portions of it away. When it comes to the surface again in the form of springs it loses some of the Carbonic acid and the lime is thrown down in the form of tufa and incrusting any object that happens to be present.'
T.W. Reader photograph album. Derbyshire, August 3rd 1914.