2016 - Sydney - Yellowblock - a photo on Flickriver

2016 - Sydney - Yellowblock

            Boating up lower Hawkesbury River, the shore in places has a pleasing display of eroded sandstone formations.

Sydney sandstone the common name for Sydney Basin Hawkesbury Sandstone, historically known as Yellowblock, is a sedimentary rock named after the Hawkesbury River north of Sydney, where this sandstone is particularly common.

It forms the bedrock for much of the region of Sydney, Australia. Well known for its durable quality, it is a highly favoured building material, especially preferred during Sydney's early years—from the late 1790s to the 1890s—its use, particularly in public buildings, gives the city its distinctive appearance.

This magnificent sandstone, up to 200 metres thick in the Sydney region, forms the foundation of the City of Sydney. 

The Hawkesbury Sandstone is a Triassic sedimentary quartzose sandstone (mainly quartz) with a smaller proportion of feldspar, clay and iron compounds such as siderite (FeCO3). 
It was formed from the sands which came from Antarctica 
about 200 million years ago, carried by a vast river system. 
Over millions of years these sands were consolidated into sandstone metres thick.

Its internal brown markings were formed by iron-rich 
water which seeped through the sandstone many years 
after the rock had been laid down. 
These are known as Liesegang rings giving attractive patterning.
Cross-bedding (inclined layers) were formed by water currents 
moving the sands across a river delta.
   

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Taken in: Australia / New South Wales / Milsons Passage (show map)

Taken on: April 7, 2016

Tags:

2016

Australia

Sydney Au

Ted McGrath

Ted's photos

Sandstone

Hawkesbury Sandstone

Yellowblock

Shoreline

Patterns

Water

Hawkesbury

Hawkesbury River

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