Thanks! Impressive as ever. Of course I did have to go look up Permian etc Doesn’t seem to matter how often I attempt memorising geological periods, they disappear. A mnemonic is required. Love big numbers like 700 million.
As far as I understand these things: The Ghubrah Bowl was formed because Permian sandstones, siltstones & conglomerates were eroded out from much harder Pre-Cambrian Diamictites & Permian Carbonates; forming the ridge of mountains surrounding the area. Some of these are more than 700 million years old & deposited by glacial action when Oman was nearer the equator & most of the earth was covered in ice, the “snowball earth” theory.
The Ghubrah Bowl depression.
David A Lockwood 
Thanks! Impressive as ever. Of course I did have to go look up Permian etc Doesn’t seem to matter how often I attempt memorising geological periods, they disappear. A mnemonic is required. Love big numbers like 700 million.
So did I 🙂
From my book ‘Oman’s Geological Heritage’ or as near as I could gather all the technicalities.
Ahem – what IS the Ghubrah Bowl depression…a geological oddity caused by what?
…
I am not geologically literate !
As far as I understand these things: The Ghubrah Bowl was formed because Permian sandstones, siltstones & conglomerates were eroded out from much harder Pre-Cambrian Diamictites & Permian Carbonates; forming the ridge of mountains surrounding the area. Some of these are more than 700 million years old & deposited by glacial action when Oman was nearer the equator & most of the earth was covered in ice, the “snowball earth” theory.