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Can you help me understand this rock formation?

 
 
Yrys
 
Reply Sat 7 May, 2016 03:54 pm
Hello
This rock formation is on the hill sides and ground. It appears to be some type of sandstone formed of pressure. As the stone breaks off in straight layers.

Can you help me identify this formation and if it's any clue to hydrology?

Here's a link to some pictures.
https://imgur.com/a/TuZNk
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Type: Question • Score: 1 • Views: 596 • Replies: 13
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farmerman
 
  1  
Reply Sat 7 May, 2016 06:31 pm
@Yrys,
what part of the world is this rock ledge? Tell me the country and the locale.
Many times , igneous rocks (like diabase or gabbroic rocks) will fracture in layers as they were cooling.
The iron staining and the patterns of the fracturing reminds me more of igneous emplacement rock.
You should get a geologic map from your government geologic survey and find this area on the map. It should be already done. If its in the US or Canada , Mexico , or most South American countries, these maps are pretty much available (many are in different states of completion however).
farmerman
 
  1  
Reply Sat 7 May, 2016 06:32 pm
@farmerman,
Im not discounting that it could be sedimentary, I just see so many other options just as plausible.
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PUNKEY
 
  1  
Reply Sat 7 May, 2016 06:34 pm
They sure look like ancient building foundations to me. They are too straight and seem to turn at 90 degree angles.
0 Replies
 
TomTomBinks
 
  1  
Reply Sat 7 May, 2016 06:47 pm
@Yrys,
Sedimentary rock turned on edge, worn down by erosion is my guess. Is this in the American west?
farmerman
 
  1  
Reply Sat 7 May, 2016 07:05 pm
@TomTomBinks,
some of the sills of the karoo of south africa look just like the pictures posted.
TomTomBinks
 
  0  
Reply Sat 7 May, 2016 07:21 pm
@farmerman,
I have no expertise, just a guess. Very interesting to try to imagine how something came to be based on how it looks now. Just had the impression this looks a lot like Oklahoma.
farmerman
 
  1  
Reply Sat 7 May, 2016 07:24 pm
@TomTomBinks,
yeh, I wish the guy'd let us know where from. I have at least 4 sites around the planet that look like it.
The erosion surfaces on the rock are familiar water type features (the edges are rounded)
TomTomBinks
 
  0  
Reply Sat 7 May, 2016 07:57 pm
@farmerman,
Do you see how there are large broken pieces of the rock near the strata? Do you think freeze/thaw cycles cause this? If so, it would narrow the possibilities somewhat. Rounded edges caused by water. Yes, but does the landscape otherwise appear to have periodic flooding? If so, wouldn't the surrounding scree (probably the wrong word) be washed away?
farmerman
 
  1  
Reply Sat 7 May, 2016 08:06 pm
@TomTomBinks,
we need to think in a time scale that occupies several thousands of years for a landscape form.

Water could be seeping in and eroding the rocks on between the "dense layers "
The reason I am not fully convinced that this area does not represent a series of igneous "Sills" is the nature of the rock itself, its apparent denseness and the "rusty look that doesnt seem to follow a "bedding plane")>
If youve ever seen the banded iron sandstones of the Mesabi, or iron rocks of the
US ATlantic Coastal Plain , The "rust" follows the bedding since its those layers that contain the "bog ore" and serve as a source for the rust. Here its almost vertical, indicating an oxygenated water in the joints and fractures thats causing the rust
TomTomBinks
 
  0  
Reply Sat 7 May, 2016 08:19 pm
@farmerman,
I have not seen any of those places. Your knowledge is way beyond me. I would also like the original poster too tell us where this is...
0 Replies
 
Yrys
 
  1  
Reply Sat 7 May, 2016 11:25 pm
Hi guys

Sorry for the late reply! I just literally just woke up. Thank you all for your valuable input.
This rock formation is in Cyprus. Coordinates as follows. 35.260719,33.230069

Where the big rock formation is there is a water way. And apparently has flowed before. Never seen it flow myself. So I also believe the rocks are rounded because of water erosion.

The rocks are very easy broken apart. And when they break they break in flat pieces in general.

There are also formations on the sides and top of hills in the surrounding area which looks like they have been exposed because of wind erosion.

Somebody said the rocks could be an indication to underground water. Do you think this might be true? If yes how?

Cheers again
farmerman
 
  1  
Reply Sun 8 May, 2016 05:52 am
@Yrys,
There are a numbr of igneous and metamorphic ocean bottom layers interbedded with seds on Cyprus.
Here is a map and you can find your location and see what the geologic makeup is. Its easy to read the geo map.
   https://upload.wikimedia.org/wikipedia/commons/8/8b/GeologicalMapOfCyprus_250k_en.jpg

As far as the hydrology, im not sure what you mean but it is probable that the interlayering of dense , impermeable rocks with more permeable rocks (like limestones or lenses ofsandstones, can result in prefered places where water can exit the rocks as springs and water falls.
The erosion that e see can be acomplished easily by sheet wash during heavier rainstorms where water gets ponded and then runs off in channels
farmerman
 
  1  
Reply Sun 8 May, 2016 06:03 am
@farmerman,
   https://upload.wikimedia.org/wikipedia/commons/8/8b/GeologicalMapOfCyprus_250k_en.jpg
USe this one to find your area and then go to the mapp and the formational index. Its rather easy. Looks like youve got igneous rocks interbedded with limestones and ocean bottom calcareous sediments. (I was assuming, from your gps coords that were in the kyrenea zone)
0 Replies
 
 

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