IMPORTANT: The Brick Pit is a restricted access area, for both safety and environmental sensitivity reasons. Please do not attempt to enter the restricted area to complete the cache.
The coordinates put you around one side of the pit near one of the many tracks around Olympic Park. GZ has been selected as it's accessible throughout the year, though the location of sign at GZ may see access restricted around Easter and other times for events at Olympic Park. The ring walk - worth the visit while you're here - is not where GZ is, though if GZ is inaccessible, you can answer Q1 from a distance and find the answers to 2 and 3 on the ring walk.
Earthcaches are a type of Virtual Cache. To log the cache, email me the answers to each of the questions below, and then if you like, upload a photo of you and/or your GPS with the Brickpit in the background to show you've been there.
Q1. Close to the cache GZ, at S33 50.643 E151 04.268 is a large set of support struts close to the brick pit. What colour are they, and optionally what are they used for?
Q2. The lower level of sediment in the Brick Pit is named ???????? Shale.
Q3. What are the names of the species of endangered frog protected in the pit?
Now the home of some species of endangered frogs, the Homebush Bay Brick Pit at Sydney Olympic Park is part of Sydney's living history.
Thankfully, plans to flood the pit did not eventuate, mainly thanks to the discover of the frogs following Sydney winning the bid in 1993. Now you can visit the Sydney Olympic Park and marvel at the distinctive geological history.
Details of the Geological History of the Brick Pit can be viewed here. The Geological Features are typical of what you find in the Sydney Basin.
The lower levels of the brick pit consist of fossilised remains from up to 250 Million years ago. The next level is 60 Million Years ago, and shows the changes caused by the forming of Australia after Gondwana broke up during the Tertiary period.
More recently (over the past 20,000 years) changes in the climatic conditions changed sea levels, converting inland river valleys into coastal estuaries, of which Sydney Harbour is an example.
In the last 200 years, the Brickpit was created - with a speckled history over the 20th Century - and in the 1990's was reclaimed, as you can read in the link below.
For more information about the Geological and other history of the Homebush Bay Brickpit and surrounds, visit History of Sydney Olympic Park.