Lherzolite, an ultramafic rock, has its type locality at Étang de Lers. The name is derived from the old spelling "Étang de Lherz".[1]
References
^Rogers, Nick; Stephen Blake; Kevin Burton; Mike Widdowson; Ian Parkinson; Nigel Harris (2008). An introduction to our dynamic planet (Co-published ed.). Cambridge: Cambridge Univ. Press. ISBN978-0521494243.