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Erratic blocks/Bludne balvany

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Hidden : 01/17/2008
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1.5 out of 5

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Geocache Description:

Erratic blocks

EN: This earthcache leads you to the unique outdoor exposition of erratic blocks near the village of Velka Kras.

Erratic blocks are stones that  have been  moved by aglacier from its original location to some new location.

In Europe one can find erratic blocks in the places where the continental glacier or big mountain glaciers were during the Cainozoic. The continental glacier slid from Scandinavian mountains across Sweden, Finland, Denmark, part of the Netherlands, Germany, Poland and finally reached the Czech border. This means the stones from northern Sweden could have made a trip up to 1500 km long before they got to the Moravian Gate.
The largest stone in Europe is probably Triglav's stone near the village of Tychow Wielki. Geologists estimate its volume at 750 cubic meters and its weight at 2000 tons. The size of this stone is 17 m x 13,5 m. Its height is not known because the stone is partially buried in the ground.

The erratic blocks consist mostly of granite and similar rocks, gneiss and migmatite. Erratic blocks in Central Europe originate mostly in Fennoscandia (Scandinavia, the Baltic Sea and Finland).

Erratic blocks in the Czech Republic

In the Czech Republic you can find erratic blocks in  Silesia and in the Javornik salient, around Ostrava and Tesin, in northern Bohemia, in the Sluknov and Frydlant salients. The size of the erratic blocks varies and  is characteristic of its area. There are only small erratic blocks in Bohemia,none being bigger than 1 m. In the Moravian-Silesian area   sizes above 1 m are quite frequent. The largest stone in the Czech Republic is 320x250x155 cm. It has been found in Ostrava – Kuncice. Its volume is approx. 7 cubic meters and its weight is 18 tons. The second largest erratic block is the granite stone in Ostrava - Poruba.

Erratic stones are very frequent in this area. Their size is mostly below 1 m. The most famous local erratic stone was found in a sand quarry in Supikovice. Its length is 275 cm. Some fossil resin was found near this stone too.

 This exposition was created by Mr. Martin Hanacek

Log conditions:

1.      Photograph yourself somewhere with whole exposition and add the photo to the log!

2.      Find stone #44 (see the notice board)! Send the name of the rock and the land where the stone comes from to our e-mail address (!

3.      Photograph yourself with the erratic stone you like most of all! Add the photo to the log!

 Bludne balvany


CZ: Tato earthcache Vas zavede do unikatni venkovni expozice eratickych balvanu nachazejici se u obce Velka Kras.


Bludne neboli eraticke balvany jsou kameny, ktere byly transportovany ledovcem ze sveho puvodniho mista vyskytu na vetsi ci mensi vzdalenost.


V Evrope najdeme bludne balvany na mistech, kam zasahl ve ctvrtohorach pevninsky ledovec nebo velke horske ledovce. Pevninsky ledovec se ze skandinavskych hor sunul pres Svedsko, Finsko, Dansko, cast Nizozemska, Nemecko, Polsko a pronikl az do ceskeho pohranici. Vidime tedy, ze balvany ze severniho Svedska urazily cestu dlouhou az 1500 km nez dorazily do Moravske brany.


Nejvetsi balvan v Evrope je pravdepodobne Triglavuv kamen u Tychowa Wielkiego. Jeho obem odhadli geologove na 750 m3 s vahou asi 2000 tun. Jeho rozmery jsou 17 a 13,5m, Treti rozmer neni znam, protoze cast tohoto balvanu je v zemi.

Z petrografickeho hlediska je vetsina balvanu tvorena zulou a ji pribuznymi horninami. Dale rulou nebo migmatitem.

Balvany ve stredni Evrope maji puvod vetsinou ve Fennoskandii (Skandinávie, Baltske more a Finsko).



Bludne balvany v Ceske republice


V Ceské republice najdeme tyto balvany ve Slezsku, v Javornickem vybezku, na Ostravsku a Tesinsku. Také v severních Cechach ve Šluknovském a Frýdlantském vybezku. Velikost balvanu se v jednotlivých oblastech znacne lisi. V Cechach se nachazi pouze balvany male velikosti, není znam ani jeden, který by dosahoval metrove velikosti. Oproti tomu v moravskoslezske oblasti jsou balvany vetsi nez 1 m pomerne caste.

Nejvetsi balvan v Ceské republice byl objeven v Ostrave – Kuncicích. Ma rozmery 320*250*155 cm. Objem je odhaden na 7 m3 a vazi asi 18 tun. Za druhy nejvetsi balvan je povazovan zulovy balvan v Ostrave – Porube.



V oblasti, kde se ted nacházíme, jsou tyto balvany velice caste. Velikost vetšinou nepresahuje 1m. Nejznamejsi mistni balvan byl nalezen v piskokvne v Supikovicich. Jeho delka je 275cm. Na této lokalite byl nalezen vedle balvanu i jantar.


Expozici, ve které se nacházíte vytvoril mistni obcan Martin Hanacek.


Podminky pro zalogovani této eartcache:

  1. Vyfotte se s  celou expozici a foto pripojte k logu

  2. Najdete kamen s cislem 44 a poslete na naší e-mailovou adresu ( zemi puvodu a horninu, ze které bludny balvan je (najdete na nástence).

  3. Vyfotte se s bludnym balvanem, který se Vam nejvice libi a foto pripojte k logu.


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