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Starohory a Prvohory / Proterozoic and Palaeozoic

A cache by Lidka&Vašek Send Message to Owner Message this owner
Hidden : 09/10/2009
1 out of 5
1 out of 5

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Geocache Description:


On the uncovered profile you can see the boundary between two geological eras — Proterozoic and
Palaeozoic.This boundary can be called...................... The right side of the profile is composed
 of ............................... lt arose about 800 millionyears ago from the sedimentation of mud and sand
on the bottom of the sea which once flooded this area.
Mountain making upsurgences within the earth, known as Kadomian Foldings, swelled
the land and subsided the sea at the end of the Proterozoic era. Proterozoic sedimentary deposits
were hardened, faulted, and partly transformed through the process of phyllitization. Due to the
factors of water wind, sun, frost, ect., the upper layers of these sediments were intensively
destroyed and eroded. On the left side of the profile it is possible to see ....................................
They developed about 500 million years ago, when the land area receded and the ocean waters,
later called the Cambrium Sea, returned. The direction and angle of the Cambrium layers are in
very sharp contrast to the Proterozoic rocks, and therefore show discordant unconformity. At the
end of the Middle Cambrium age, the sea degressed from this area, never again to retum.
Several million years later, between Devonian and Carbonian times, there were groups of
Proterozoic and Paleozoic layers faulted and deformed by land upswellings known as Hercynian foldings.

And now your task:
To log this Earthcache, take a photo of yourself close to the information panel and send me (
email in profile) the correct answers
of the following questions:
1. What is the name of this boundary?
2. What is the composition of the left and the right side of the boundary?

Please do not wait for the approval to log the cache after sending the answers. Log it directly
and we will contact you if anything is wrong!!!!!!!

Na odkrytem profilu  hornin vidite hranici mezi dvema geologickymi erami starohorami (proterozoikem)
a prvohorami (paleozoikem).Hranice se nazývá................................Pravou cást profilu tvorí........................
Vznikly asi pred 800 milionylety usazovanim bahna a pisku na dne more ktere, zaplavovalo zdejší krajinu.
 Horotvorne sily koncem proterozoika (kadomske vrasneni) vyzdvihly ulozeniny a more ustoupilo.
Proterozoicke ulozeniny (sedimenty) byly deformovany, poruseny zlomy a slabe pretvoreny (fylitizovany).
Pusobenim povetrnostnich vlivu (voda, slunce, vitr, mraz ap.) doslo k intenzivnimu zvetravani a odnosu vrchni
casti souvrstvi. V leve casti profilu jsou dobre patrne vrstvy....................... Byly ulozeny pred 500 miliony
let, kdyz Uzemi opet pokleslo a bylo zaplaveno kambrickym morem. Smer a sklon kambrickych vrstev
je v ostrem Uhlu k proterozoickym horninam. Koncem stredniho kambria more ze zdejsiho uzemi
ustoupilo jiz natrvalo. O mnoho milionu let pozdeji na prelomu devonu a karbonu byl cely vrstevni sled
hornin proterozoika i paleozoika znovu deformovan a porusen horotvornymi silami variskeho vrasneni.

A nyní ukoly:
Do logu vložte fotografii s vami a info tabuli a odpovezte (email pres profil) na otazky:
1. Jak se nazývá tato hranice?
2. Co tvori pravou a levou cast profilu?

Na schválení odpovedí necekejte!!!!!

Additional Hints (No hints available.)



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Coordinates are in the WGS84 datum

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