Geological Past of Risvica Hill EarthCache

This EarthCache will lead you up to the Risvica Hill. There is a nicely prepared geological trail that starts at the waypoint "Start of Geological Trail". The geological trail leads to the Risvica Hill peak, and along the trail there are several educational info boards about the geology of Risvica Hill.

Start of Geological Trail on Risvica Hill

Going up from Zelenjak valley to the highest peak of Risvica Hill is like a journey through more than 200 million years of history. During such a long geological period, several continents and oceans developed and disappeared, as well as periods of tropical climate and ice age. Living world changed also drastically. Lots of new animal and plant species appeared, while at the same time a lot of them vanished from the face of the Earth. Some of those turbulent events left their mark in the rocks of Risvica Hill.

Geologic Time Scale

The story of Risvica Hill begins some 220 million years ago, during the Triassic, a geologic period that extends from roughly 252.17 to 201.3 million years ago. During the Triassic, almost all the Earth's land mass was concentrated into a single supercontinent centered more or less on the equator, called Pangaea ("all the land"). From the east a vast gulf entered Pangaea, the Tethys sea. It opened farther westward in the mid-Triassic, at the expense of the shrinking Paleo-Tethys Ocean, an ocean that existed during the Paleozoic. The remaining shores were surrounded by the world-ocean known as Panthalassa ("all the sea").

Continental Drift

Another important period for the history of Risvica Hill was the Miocene. The Miocene is the first geological epoch of the Neogene Period and extends from about 23.03 to 5.332 million years ago. Continents continued to drift toward their present positions. Of the modern geologic features, only the land bridge between South America and North America was absent. Mountain building took place in western North America, Europe, and East Asia. Both continental and marine Miocene deposits are common worldwide with marine outcrops common near modern shorelines.

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Sources

Ovaj EarthCache će Vas dovesti do vrha Risvičke gore. Na Risvičkoj gori je izrađena lijepa geološka edukativna staza koja započinje kod waypointa "Start of Geological Trail". Geološka staza vodi do vrha Risvičke gore, a uz stazu se nalazi nekoliko edukativnih info ploča o geologiji Risvičke gore.

Početak geološke staze na Risvičkoj gori

Popnete li se stazom od doline Zelenjak do vrha Risvičke gore usput ćete prošetati kroz više od 200 milijuna godina povijesti ovog brda. Tijekom tako duge geološke prošlosti pojavljivali su se i nestajali mnogi kontinenti i oceani, a tropske vrućine su se izmjenjivale s ledenim dobima. Drastično se mijenjao i živi svijet. Pojavile su se brojne nove životinjske i biljne vrste, dok su istovremeno neke zauvijek nestale s kugle zemaljske. Dio tih burnih događaja zapisan je i u stijenama koje grade Risvičku goru

Geološka razdoblja

Priča o Risvičkoj gori započinje prije nekih 220 milijuna godina, tijekom geološkog razdoblja trijasa (prije 252,17 do 201,3 milijuna godina). Tijekom trijasa gotovo cijelo kopno na Zemlji je bilo koncentrirano u jednom superkontinentu čiji se centar nalazio na ekvatoru. Taj superkontinent je nazvan Pangea ("sva zemlja"). S istočne strane siuperkontinenta, veliki zaljev je ušao prema unutrašnjosti Pangee, a nazvan je Tethys more. Sredinom trijasa zaljev se nastavio širiti prema zapadu, te je time došlo do smanjivanja Paleo-Tethys oceana, oceana koji je postojao tijekom paleozoika. Ostale obale su bile okružene svjetskim oceanom koji je poznat pod nazivom Pantalasa ("svo more").

Pomicanje kontinenata

Drugo važno razdoblje u povijesti Risvičke gore je bio miocen. Miocen je prva geološka epoha unutar razdoblja Neogena (prije 23,03 do 5,332 milijuna godina). Kontinenti su nastavljali pomicanje prema njihovim današnjim pozicijama. Od suvremenih geoloških formacija jedino je još nedostajao kopneni spoj između Južne i Sjeverne Amerike. Proces nastajanja planina je bio aktivan u zapadnom dijelu Sjeverne Amerike, u Europi i u Istočnoj Aziji. I kopneni i morski sedimenti iz miocena su česti diljem svijeta, osobito morski izdanci koji se mogu naći u blizini današnjih obalnih područja.

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