Elephant Rocks:
Along the eastern side of Elephant Cove, you'll find some rocks that look out of place on the predominantly granitic South Coast of Western Australia. They are fine-grained and dark, suggesting volcanic origins - the remains of a volcanic dyke. The long, straight cove was formed through erosion along this line of weakness.
This, along with the jointed nature of the granite's to the West (the elephants) gives some clue about the formation of the cove and the elephants, and why its two headlands are so long and straight. The bay was most likely formed by a volcanic dike eroding faster than the surrounding granitic rocks.
By definition, basalt is an igneous rock and is the most common volcanic rock type on Earth, being a key component of oceanic crust. Basalt commonly features a very fine-grained or glassy matrix interspersed with visible mineral grains.
What you need to do to claim this EarthCache:
Compulsory Questions:
1. Is Basalt igneous, metamorphic or sedimentary rock?
2. Measure the thickness of the basalt. How thick in centimetres is it?
3. Approximately, what bearing is the basalt formation on?
4. The basalt here is on quite an incline, what is the approximate angle of this incline?
Optional task:
Take a photo of yourself while at Elephant Rocks.
In accordance with the guidelines, the procedure for logging an Earthcache is:
- Send me the answers.
- Log your visit. "People do not need to wait for permission to log your EarthCache."
Please note : You are welcome to log this Earthcache after sending your answers to me. If no answers are received, your log will be deleted. Please be mindful of your logs to ensure there are no spoiler images/answers for the questions above, spoilers will also be removed.