Skip to Content

EarthCache

Bludny balvan / Glacial Erratic (Earth)

A cache by BarbieTeam Send Message to Owner Message this owner
Hidden : 8/6/2008
Difficulty:
1 out of 5
Terrain:
1 out of 5

Size: Size: not chosen (not chosen)

Join now to view geocache location details. It's free!

Watch

How Geocaching Works

Please note Use of geocaching.com services is subject to the terms and conditions in our disclaimer.

Geocache Description:

Možná na to nevypadá, ale je z daleka...
It may not look like it, but it comes from far away...



Nejen v Jeseníku, ale v celé oblasti Moravské brány je možné spatrit celou radu kamenu, které do techto míst doputovaly pri posunu ledovcu z dalekých severských kraju. Navštivte s námi jeden takový kámen, jenž zustal ležet prímo v centru mesta.

Bludný ("eratický") balvan je blok horniny, který byl v dobe ledové prepraven ledovcem na velkou vzdálenost, kde byl po roztátí ledovce usazen v geologicky zcela odlišném prostredí. Tato teorie se objevila až koncem 19. století, do té doby se jejich výskyt vysvetloval potopou sveta, vulkanickou cinností ci „cinností“ certu, kyklopu a dalších bájných tvoru. Oznacení pochází z latinského „erare“, znamenajícího "bloudit". Príkladem mohou být balvany skandinávské žuly rapakivi a jiných hornin z Ålandských ostrovu a dalších míst Skandinávie na severní Morave, které byly dopraveny pohybem pevninského ledovce ve starších ctvrtohorách v období halštatského (cca pred 470-430 tis. lety) a sálského zalednení (pred 230-170 tis. lety). Granity a ruly (pro svoji odolnost) v nálezech prevažují, dalšími horninami nalezenými na severní Morave jsou migmatity, pískovce, vápence.

Pestrost nálezu príkladne dokumentuje naucná zahrádka 32 bludných kamenu budovaná ve Velké Kraši.

Na uvedených souradnicích krome kamene najdete jesenickou vodní tvrz, které je venována i stejnojmenná keš.

K zalogování nálezu postací splnit následující podmínky:
1.) najdete na uvedených souradnicích bludný balvan :-)
2.) poridte foto, na kterém budete vy, vaše GPS a balvan (ne však citelná cedule)
3.) zjistete složení a hmotnost balvanu
4.) foto priložte k logu a oba údaje nám pošlete pres profil
Nemusíte cekat na potvrzení, jen v prípade nesprávného splnení úkolu od nás asi ješte uslyšíte :-)
Dobrý lov!


A glacial erratic is a piece of rock that deviates from the size and type of rock native to the area in which it rests; the name "erratic" is based on the errant location of these boulders. These rocks were carried to their current locations by glacial ice, often over hundreds of kilometres. Erratics can range in size from pebbles to large boulders such as Big Rock (16,500 tons) in Alberta. Geologists identify erratics by studying the rocks surrounding the position of the erratic and the composition of the erratic itself. Erratics were once considered evidence of a massive flood approximately 10,000 years ago, similar to the legendary floods described in the texts of ancient civilizations throughout the world. Ancient legends of an epic flood come from many cultures including Mesoamerican, Sumerian (Epic of Gilgamesh), Hebrew (Old Testament) and Indian culture. In the 19th century, many scientists came to favor erratics as evidence for the end of the last glacial maximum (ice age) 10,000 years ago, rather than a flood. Geologists have suggested that landslides or rockfalls initially dropped the rocks on top of glacial ice. The glaciers continued to move, carrying the rocks with them. When the ice melted, the erratics were left in their present locations.

This particular „erratic stone“ is located in the centre of Jeseník, near an old water fort – don’t forget to visit the nearby traditional cache! The stone came from what is now the southwest of Finland and is one of the biggest erratic stones in the region.

The reason why "erratic stones" appear so frequently in the area around Jeseník, the "Moravian Gate", is because of the unique landscape: a gap between two mountain ranges had become the place where, for millenia, glaciers ended their long and slow journey from the north. To learn more about erratic stones in this region you should visit the "stone garden" in Velká Kraš, an exhibition of 32 erratic stones found in the area around Jeseník and the town Vidnava. The Moravian Gate is also a water divide between the Baltic and the Black Sea.

To log this cache, you have to follow these steps:
1.) Locate the stone at the given coordinates :-)
2.) Take a photo of yourself, your GPS unit and the stone (without the info panel or so that it is illegible)
3.) note the type and weight of the stone
(since the info panel is in czech only: type = the first 3 words; weight: number in second-to-last line)
4.) attach the photo to your log and send us the answers via profile

Enjoy the hunt!

Additional Hints (No hints available.)



 

Find...

2,259 Logged Visits

Found it 2,248     Write note 8     Publish Listing 1     Owner Maintenance 1     Post Reviewer Note 1     

View Logbook | View the Image Gallery of 2,028 images

**Warning! Spoilers may be included in the descriptions or links.

Current Time:
Last Updated:
Rendered From:Unknown
Coordinates are in the WGS84 datum

Return to the Top of the Page

Reviewer notes

Use this space to describe your geocache location, container, and how it's hidden to your reviewer. If you've made changes, tell the reviewer what changes you made. The more they know, the easier it is for them to publish your geocache. This note will not be visible to the public when your geocache is published.