Rock Formation

[derek-33]

http://i67.tinypic.com/efibef_th.jpg
can anyone tell me how this rock (brick looking) base was formed millions of years ago
on stanidge edge Sheffield peak district
just hope this tinypic think works

[AuntLydia]

Its a kind of metamorphic rock
"fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. "

[derek-33]

wow thanks auntlydia
been puzzling me since i saw it last week

[derek-33]

a better pic here hopefully

http://oi67.tinypic.com/x21bmg.jpg

[sanmac]

Yes, but how did the brick structure get underneath it? Isn't that the main question?

[Mamyalynne]

Being a gritstone area some of the formations are quite impressive.

Some info here too.

https://www.geolsoc.org.uk/Education-and-Careers/Plate-Tectonic-Stories/Stanage-Edge

[AuntLydia]

The brick structure did not get underneath it, the boulder ( the top rock) fell onto it as some time. The boulder is a different rock type, possibly an igneous rock such as granite .

[AuntLydia]

yes mamylynne the boulder could be carboniferous Millstone Grit.

[derek-33]

the boulder like the test of stanidge edge is grit stone (used for milling wheels ) looks like the underneath of this boulder is shale stone now ive delved into it just unusual that it looks man made in its formation here