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Les Orgues de Montpeloux

A cache by Spirou43 & Poune43 Send Message to Owner Message this owner
Hidden : 01/17/2011
Difficulty:
1.5 out of 5
Terrain:
2 out of 5

Size: Size: not chosen (not chosen)

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Geocache Description:


LES ORGUES DE MONTPELOUX

Francais

Histoires géologiques

Le cratère de ce volcan datant de 18 millions d’années, empli d’un lac de lave de basalte,

s’est cristallisé sous forme d’orgues dont l'explication est la suivante :

Peu apres l'éruption, les orgues volcaniques se faconnent perpendiculairement à la surface froide qui entoure une masse de lave brulante :

en se refroidissant lentement, le magma se rétracte et se constitu en prismes rocheux à sections géométriques régulières.

Longtemps après avoir servi de promontoire à un puissant château fort,

le Montpeloux fut peu à peu grignoté par les travaux d'une carrière de basalte, qui nous permettent aujourd'hui de pénétrer dans le ventre du volcan.

De belles falaises de prismes basaltiques et des coupes géologiques grandeur nature ont été mises à jour,

qui fascinent les géologues, invitent à la contemplation... et au spectacle !

Pour loger cette earthcache vous devez répondre par contact privé aux questions suivantes :

1 - Quelles sont les 3 formes de prismes que forment les orgues ?

2 - Quelle est la longueur des orgues au centre du lac ?

3 - Et, seulement si vous le désirez, joignez à votre log une photo de votre GPS aux coordonnées (ou bien de vous si vous préférez)

Les réponses se trouvent sur le panneau explicatif bleu du promontoire.

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English

Geological History

The crater of the volcano dates from 18 million years ago, when a lake of basaltic lava,

cooled in the form of organ pipes, the explanation for which is as follows:

Shortly after the eruption, the lava flows arranged themselves perpendiucularly

on the cold surface which surrounded a mass of boiling lava:cooling slowly

the magma retracted and changed into rocky prisms with regular structures.

Having served as a promontary for a powerful castle for a long time,

the Montpeloux was eaten away little by little by the mining of basalt,

which tyoday permits us to penetrate into the centre of the volcano.

Beautiful cliffs of balsaltic prisms and geological cuttings have fascinated geologists

and have invited us to think and to enjoy the spectacle.

To log this earthcache you need to reply by email to the following questions

1 - What are the three forms of prisms which form the organ pipes?

2 - What is the length of the organs in the centre of the lake?

3 - Once you have received confirmation of the correct replies,

you can log the cache along with a photo (only if you wan't, it's for the fun) of your GPS at the coordinates (or of yourself if you wish!).

Answers are on the blue explicative panel of the promontory.

 

 

 

 

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68 Logged Visits

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Rendered From:Unknown
Coordinates are in the WGS84 datum

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