Pinnak Sandstone?

[Aussiedigs]

Hi guys, trying to identify this rock common south of Beechworth. Pinnack Sandstone or would it go by another name?

Thanks guys.

 

[Aussiedigs]

Actually upon further research it maybe Mudstone. I think Pinnak Sandstone is related to Granite?

http://www.beechworthvineyards.com.au/soils-geology/

 

[Aussiedigs]

 

[user 4386]

Your photos seem to be slate, siltstone and sandstone. Pinnak Sandstone is simply the name for one of many sedimentary rocks in the highlands, and has absolutely nothing to do with granite - it is sedimentary rock deposited in the sea.

 

[Aussiedigs]

Your photos seem to be slate, siltstone and sandstone. Pinnak Sandstone is simply the name for one of many sedimentary rocks in the highlands, and has absolutely nothing to do with granite - it is sedimentary rock deposited in the sea.

Thanks Goldirocks. Sorry mate i didnt see your reply till now. So it wouldnt be mudstone? It looks very similar to the clay present but in a stone!

 

[user 4386]

Your photos seem to be slate, siltstone and sandstone. Pinnak Sandstone is simply the name for one of many sedimentary rocks in the highlands, and has absolutely nothing to do with granite - it is sedimentary rock deposited in the sea.

Thanks Goldirocks. Sorry mate i didnt see your reply till now. So it wouldnt be mudstone? It looks very similar to the clay present but in a stone!

When mudstone is heated during burial it becomes slate (the clay minerals recrystallise to fine grained micas). The original mudstone or shale becomes slate. What often complicates things is that at surface, weathering often converts the micas back into clays - however the rock retains the texture of the slate, so we would then call it "weathered slate".