Shale is a fine-grained, clastic (composed of broken pieces of older rocks) sedimentary rock composed of mud that is a mix of flakes of clay minerals and tiny fragments (silt-sized particles) of other minerals, especially quartz (crystal structure - the second most abundant mineral in Earth's continental crust, after feldspar) and calcite (basically calcium carbonate crystals). The ratio of clay to other minerals is variable.
The colour of shale
Shales are typically composed of variable amounts of clay minerals and quartz grains and the typical colour is gray. Addition of variable amounts of minor constituents alters the color of the rock.
More on Shale
Shale rocks are those that are made of clay-sized particles and are have a laminated appearance. They are a type of sedimentary rock. Shale is the abundant rock found on Earth. They are usually found in areas where gentle waters have deposited sediments that become compacted together.
At GZ you will find a yellow Survey Marker. Look around you at the prominent rock formations. There are no granite boulders here, such as on nearby Mount Franklin. Instead you will find something completely different.
Answer these two questions:
*Describe in your own words, the type of rock prominent around the marker.
According to Wikipedia : The geology of the range comprises block-faulted granites and Palaeozoic metamorphic rocks. There are small areas of Tertiary basalt with buried river gravels and lake sediments. The typical characteristics of the range include low-relief high plains with steep margins and slopes and fault aligned river valleys with deep gorges and waterfalls.
*Which geological features of the above description are obvious to you where you stand?
Send your best answers to the two questions above via the "Message this owner" link at the top of the page. Please don't send via email if possible - I don't deal with email very well. For extra brownie points, include a close-up of the rock formation you found most fascinating.
Enjoy this wonderful spot