The limestone (grey) was deposited in the Pindos Basin in the Neotethyan ocean in the Mediterranean region of today. During compaction and burial ground water solutions bearing dissolved silica selectively replaced some of the limestone, creating bands, layers, and nodules of chert (black). The rock formation was then subjected to compressional deformation, producing thrust faults and folds regionally. In response to stress, the very stiff, brittle chert layers responded by pervasive close-spaced fracturing. The limestone responded (in part) by pressure dissolution and the formation of calcite veins (white).
I collected this rock in the summer of 2007 near the village of Ano Karyes in the Peloponessos, not far from the Sanctuary of Zeus at Mt. Lykaion. I like the aesthetics of this little piece of sculpture.
Age & Formation
Grey limestone of the Flysch Transition Beds of Paleocene age, ~60 Ma.