Photographer: Lutz Geißler
Location: Jasmund National Park, Rügen Island, Mecklenburg-Vorpommern, Germany
Flintstone bands are a typical feature of the chalk coast of Rügen Island. The flintstones are no rocks deposited together with the chalk but formed in-situ within the chalk. Lower units of the chalk with less or no available oxygen changed their pH-value caused by bacterial activity. As a result, silicic acid was released out of SiO2-forming organisms like radiolarians and diatoms,which are important constituents of the chalk. This silicic acid accumulated especially at relics of former organisms. Thus, flintstone seems to be a kind of a concretion.
Tags: Baltic Sea, chalk, chert, Feuerstein, Feuersteinbildung, Feuersteinentstehung, flint, flintstone, ice age, Kiesels├Ąure, Kreide, Kreidek├╝ste, Mecklenburg-Vorpommern, Ostsee, pleistocene, R├╝gen, Schreibkreide, silicic acid, Steilk├╝ste