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Iscritto: Mar 2004
Posts: 8,347 Mi piace: 4
M Member
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OP
M Member
Iscritto: Mar 2004
Posts: 8,347 Mi piace: 4 |
Il link precedente non si capisce molto, http://www.bobspixels.com/kaibab.org/geology/gc_layer.htm#rlriporta qudsto a proposito del redwall limestoen e del suo colore rossastro Redwall Limestone - This layer averages about 335 million years old and is composed of marine limestones and dolomites. This is probably the most prominent rock layer in the Canyon as it usually forms a sheer cliff ranging from 400-500 feet in height, which has become a natural barrier between the upper and lower regions of the Canyon. The only way though this barrier is in areas where the rock has faulted and broken apart to form a slope which can be climbed upon. The deep reddish color of this layer is caused by iron oxides leaching out of the layers above it and staining its outward face. Behind the reddish face the rock is a dark brownish color. Numerous marine fossils can be found in the Redwall Limestone including brachiopods, clams, snails, corals, fish and trilobites. Many caves and arches can also be seen in the Redwall.
"Data speak for themselves" -Reverend Thomas Bayes 1702-1761
P(Ai|E)=(P(E|Ai)P(Ai))/P(E)
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Iscritto: Aug 2007
Posts: 291
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Iscritto: Aug 2007
Posts: 291 |
con queste informazioni aggiuntive, non c'è dubbio ci troviamo in presenza di un sistema carsico di notevole importanza: ci sono delle similitudini con il Paleozoico della Sardegna, (ovviamente non nelle dimensioni!!!)..
sarà interessante lo studio e la ricerca per i geologi e gli speologi americani...
sarebbe interessante sapere l'entità dello sprofondamento...quanti metri sotto?!!
Laura
Arual
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