GeologyRocksInteresting rock feature
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Weathering and erosion of
Wed, 08/27/2008 - 19:38Weathering and erosion of the sandstone are the likely causes I think. One detailled foto is of course a small database to judge from but it does not look like a man-made cavity in the rock. It may be the case that the rock also contains bigger pebbles that are easily eroded out of the general rock context. Perhaps it was also lenses of softer material like silt.
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Thanks for the quick
Wed, 08/27/2008 - 19:50Thanks for the quick reply.
Sorry for the lack of scale/context. The rock seemed to be layer ed horizontally in it's current location (I realise it could be out of any original context) but the weathering marks appeared to be mostly vertical (as you'd expect), epecially with the large hole feature (you can see a vertical "crack" at the top). The feature in the first photo seemed "strange" in that it was horizontal (it was about 1m in total length and my wrist , but not my fist, would probably fitted under the "bridge"). I'd not considered a lens of weaker material but that makes sense given the horizontal layering of the rock.
Thanks!
Mac
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Many thanks, looking round
Fri, 08/29/2008 - 08:26Many thanks, looking round there is an almost identical feature (with less weathering) show at: http://z.about.com/d/geology/1/0/m/K/cavernous.jpg
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Interesting rock feature
Submitted by Mascot on Wed, 08/27/2008 - 19:29.Hi,
I'm new here and looking for a bit of expert advice. I spend a bit of time roaming round Northumberland visiting Iron Age sites and I wondered if anyone could say what natural processes might have created a rock feature I found last month.
I think the rock type is a coarse sandstone but can't be sure. The rock certainly release coarse grains if you rub hard with a finger/stick.
The full context is described at http://www.themodernantiquarian.com/site/11448/beanley_plantation_settlement.html.
Briefly the feature is on the vertical face of a large rock outcrop and looks like a long groove with a short bridge over it. I've attached a photo. The other photo show the general context of the rock face and a simpler large "hole" in the rock face to the left of the feature above.
Thanks in advance for any help
Mac