Before revision: This type of ignimbrite tuff , different from Naples yellow tuff, takes on a particular texture characterised by the orientation of lenticular concentrations of grey colour, called flames, immersed in a matrix of the same colour but lighter.
After revision: This type of ignimbrite tuff takes on a particular texture characterised by the orientation of lenticular concentrations of grey colour, called flames, immersed in a matrix of the same colour but lighter.