Sandstone, Glauconite, Quartz
Grünten, Burgberg im Allgäu, Oberallgäu District, Swabia, Bavaria, Germany
Green sandstone of the “Garschella Formation”.
Petrography: light-grey-green, fine-grained, glauconite-bearing, siliceous bound quartz sandstone.
Age: Middle Cretaceous (Abt, Alb).
Origin: Helvetic (e.g. Mooskögel near Murnau, Grünten, Kappeler Höhe).
Reference: Günter Grundmann & Herbert Scholz (2006): Kieselsteine im Alpenvorland - ...
© Günter Grundmann, Detmold.