Tender rock, stone hard, a photo from Sal, Barlavento

Photographer's Note

April 14, 2006
With the return of our sighting tour of the island, we have to roll in fields of dust. Time in time, we where in swirls. Impossible to see no matter what is. At the turning of a dirt track, we arrived close of a kind of gravel pit located between the hills of Monte Grande and Rocha de Salina. From here it seems that one extracts from granulated from ground. Probably volcanic ash dating from the formation of the island. And in the medium of these pellets, there are stone columns definitely harder. I do not know which is the name of these formations. If somebody is able to light my lantern... Thank you in advance.

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Critiques | Translate

maki (0) 2006-07-25 4:18

It looks like from the moon or... Kapadokya in Turkey. Colourful, deserted place. I can imagine what happens when the sun is going down :o))
Well done,
regards,
maki

xuaxo (6854) 2006-08-08 4:10

Bonjour Jacques
This photo shows very well how dry Sal is.
I don't know the geological names for this rocks.
Francisco
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Ashrain (124) 2007-09-12 4:11

The far rocks are probably sedimentary (sandstone like). The fore formation, if this is a vulcanic area, is probably a so called "neck": the harder rock is an intrusive vulcanic one, that formed in the conduct of an ancient vulcanic cone, and never went out. While the softer one is an effusive rock, or pyroclastic, easyer to be eroded. The result of millions of years of erosion, is that the vulcanic cone has been eroded and cleaned away, and the interior is still in his place!