the postman
When we had a chat about xenoliths in the frankly otherwise drab Eugowra Granite in which our temple of democracy is clad I promised to show you some geology down the way because the denizens in this place don't trust me with a camera. I have delivered.
There's less of it than there was. The politicians in the Parliament House have fewer connections to the outside world, or so it seems, than the House itself. One of those connections is a bridge flying over State Circle from Commonwealth Avenue. I'm sure it wasn't necessary but in building that bridge they scraped away a big chunk above what you see here. Still, it remains impressive.
At the bottom of the frame is the State Circle Shale, Early Silurian in age and deposited in deep water. On top of this was the conformably deposited Black Mountain Sandstone. The whole lot lifted up by orogenic forces so that deposition ceased and erosion cut down into these rocks. Up the hill a bit, some of the Black Mountain Sandstone remained. Down here it was all eroded away.
When this part of the world found itself beneath the sea again, the Camp Hill Sandstone was deposited unconformably on top. That's it at the top of this frame. You can see by the tilting and faulting obvious in this shot that this wasn't the end of the story. But it's enough for me to feel comfortable that my promise has been kept.
the postman
When we had a chat about xenoliths in the frankly otherwise drab Eugowra Granite in which our temple of democracy is clad I promised to show you some geology down the way because the denizens in this place don't trust me with a camera. I have delivered.
There's less of it than there was. The politicians in the Parliament House have fewer connections to the outside world, or so it seems, than the House itself. One of those connections is a bridge flying over State Circle from Commonwealth Avenue. I'm sure it wasn't necessary but in building that bridge they scraped away a big chunk above what you see here. Still, it remains impressive.
At the bottom of the frame is the State Circle Shale, Early Silurian in age and deposited in deep water. On top of this was the conformably deposited Black Mountain Sandstone. The whole lot lifted up by orogenic forces so that deposition ceased and erosion cut down into these rocks. Up the hill a bit, some of the Black Mountain Sandstone remained. Down here it was all eroded away.
When this part of the world found itself beneath the sea again, the Camp Hill Sandstone was deposited unconformably on top. That's it at the top of this frame. You can see by the tilting and faulting obvious in this shot that this wasn't the end of the story. But it's enough for me to feel comfortable that my promise has been kept.