In the middle of this park, you will find a rock sphere. The sphere is constructed from a combination of Brecciated Marble and Granulitic Schist. The sphere sits on a raised base of Black Granite, with the whole construction surrounded by a porous pavement of local Basalt. It weighs over 10 tonnes and is 150cm in diameter!
The floating stone was a gift to the community of Bunbury from Aqwest Bunbury Water Board. The stone celebrates the board’s 100th year of service to Bunbury and the close long-term working relationship between the board and the City of Bunbury. The location was chosen because it is less than 100m from the site of Bunbury’s first public well, excavated through basalt more than 100 years ago.
So, you may ask, what does all that mean! Well, I'm glad you asked.
Brecciated - refers to a lithified rock comprising mainly of angular fragments of rock, larger than 2 millimetres.
Granulitic - a metamorphic rock consisting of similarly sized, interlocking minerals.
Marble - a hard crystalline metamorphic form of limestone, typically white with coloured mottlings or streaks.
Schist - a coarse-grained metamorphic rock consisting of layers of different minerals and can be split into thin irregular plates.
Please email me the answers to the following questions:-
1. What kind of rock type are Marble and Schist? (Igneous, Sedimentary or Metamorphic)
2. Closely examine the sphere, what is the predominant rock present and how can you tell?
3. Is the sphere brecciated, and if so, how can you tell?
4. Take a picture in the vicinity and upload it with your found log.
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 : If answers have not been received within 10 days, you will risk having your found log removed.