Clay building in a soil aggregate
by Antonio Jordán, University of Seville, Sevilla, Spain
The photo shows a channel time ago occupied by a root, on which a film of clay accumulated. The material surrounding it has been lost, but the clayey wall still remains.
Angel Gordillo-Rivero (University of Wageningen, University of Seville) kindly holds the aggregate.
Antonio Jordán (distributed via imaggeo.egu.eu)