Prirodni pamatka Olsava - Natural Monument Olsava EarthCache
Prirodni pamatka Olsava - Natural Monument Olsava
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Poslední zbytek prirozeneho neregulovaneho koryta reky Olsavy se nachazi mezi obcemi Podoli a Mikovice. V roce 1999 byl vyhlasen Prirodni pamatkou. Celkova vymera: 3,4361 ha.
The last rest of the natural non-regulated bed of Olsava River can be found between villages Podoli and Mikovice. In 1999 was this place declared Natural monument. Total area: 3,4361 ha.
CZECH
Puvodne byla Olsava divocici rekou; dnesni relief se utvarel behem poslednich 6000 let. Tento neregulovany usek je krome ukazky puvodnich rek nasi krajiny take ukazkou geologickeho a geomorfologickeho vyvoje ctvrtohorni krajiny.
Udoli reky Olsavy na tomto uzemi patri geologicky k flysovemu pasmu zapadnich Karpat. V tretihorach bylo toto uzemi soucasti Ceskeho masivu a bylo tvoreno krystalickymi horninami. Ve starsich tretihorach se zde ukladaly sedimenty magurskeho flyse. Flys je charakterizovan jako sediment, kdy se stridaji piskovcove a jilovcove vrstvy.
Vetsina sedimentu se nasledne ukladala v paleocenu a eocenu. Ve svrchnim eocenu konci sedimentace v dusledku tektonickych pohybu, ktere vedly ke vzniku magurskeho prikrovu a jeho dilcich jednotek – belokarpatske, bystricke a racanske.
Oblast severne od udoli Olsavy spada pod racanskou jednotku a jih od Olsavy pod belokarpatskou jednotku, ktera je tvorena flysem s prevahou jilovcu.
Na levem okraji udolni nivy muzeme videt strmou, misty az 12m vysokou stenu, kde lze dobre rozlisit navej sprasi a sprasovych hlin s fosilnimi pudami a pudnimi sedimenty spocivajicimi na paleogennich sedimentech. Mocnost steny je v Ceske republice unikatni.
Ze zoologickeho hlediska jde o velmi vyznamnou lokalitu. Z ohrozenych druhu ptaku zde nachazi podminky ke hnizdeni napr. lednacek ricni (Alcedo atthis), strakapoud maly (Dendrocopos minor), slavik obecny (Luscinia megarhynchos), moudivlacek luzni (Remiz pendulinus), rakosnik zpevny (Acrocephaluspalustris), rakosnik prouzkovany (Acrocephalus schoenobaenus), rehek zahradni (Phoenicurus phoenicurus), zluna zelena (Picus viridis), zluva hajni (Picus viridis), cvrcilka zelena (Locustella naevia). Jeste v 80. letech 20. stol. zde hnizdil i tuhyk mensi (Lanius minor).
Pri navsteve earth kese pouzijte waipointy. Nezastavujte autem u hlavni silnice. Po ceste kolem informacni tabule se dostanete na misto oznacene jako pristupovy bod – zde zahnete vlevo a pokracujte podel plotu ke stromum a dal na breh reky. Z uvodnich souradnic uvidite nejhezci cast protejsi steny.
Pro uznani logu nam poslete emailem odpovedi na nasledujici otazky:
1) Na informacni tabuli zjisti, jak se jmenuji vrstvy a souvrstvi, ktere reprezentuji magursky flys, na nemz spociva udolni niva reky Olsavy?
2) Z jakych jednotek se sklada Magurska skupina prikrovu a v jakem obdobi byly tyto jednotky utvareny?
3) Zjistete nadmorskou vysku na miste, kam vas privedou uvodni souradnice.
4) V okoli uvodnich souradnic najdete skeble a vyfotte je tak, aby v pozadi byla videt stena sprase a prilozte fotku k vasemu logu.
ENGLISH
Originally Olsava was a wild river; current relief was formed durring last 6000 years. This non-regulated part is the good example of authentic river in our lands and shows also the geological and the geomorphological evolution of Quaternary landscape.
River valley in this area belongs geologically to flysch zone of the Western Carpathians. In the Tertiary was a part of Czech massif and was formed by crystalline rocks. In older Tertiary started the storage of Magurian flysch sediments. Flysch is described as a sediment where alternate the sandstone layers with the claystone layers.
The most of sediments was stored in Paleocene and Eocene periods. In older Eocene the sedimentation ends as a result of of tectonic movements and Magura nappe and the sud-units (Belokarpatska, Bystricka and Racanska) are formed.
The North of Olsava valley belongs to Racanska unit and the South to Belokarpatska unit that is formed by flysch with a predominance of claystone.
On the left bank can be found the Palaeogene sediment face up to 12m high on which leans the drift of loess, loess soil with fossils and soil sediments. The height of sediment face is unique in Czech republic.
This place is also very important from the zoological point of view. The nests of the following endangered bird species can be found here: Kingfisher (Alcedo atthis), spotted woodpecker (Dendrocopos minor), Nightingale (Luscinia megarhynchos), Penduline titmouse (Remiz pendulinus), Sedge warbler (Acrocephalus schoenobaenus), Redstart (Phoenicurus phoenicurus), Woodpecker (Picus viridis). Till the 80‘s of the 20th century the Butcher-bird (Lanius minor) had his nest here too.
If you are going to visit this earth cache, please check the waipoints. Don’t stop your car on the main road. Go from the parking to the information board and continue to reference point. Turn left here and go along the fence to the river bank. From the initial coordinates you will see the most beautiful part of the sediment face.
To accept your log, send us by email the answers of the following questions:
1) Found out on the information board how are called layers and formations that represents Magurian flysch on that fluvial plain of Olsava river leans?
2) From which sub-units is composed Magura nappe and in what period were these units formed?
3) Send us the altitude from the given start coordinates
4) Found the clams around the start coordinates; take their photo with the loess face in the background and place this photo in your log.
Additional Hints
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