What are the 4 main dating methods for the past?
Potassium-argon dating is a radiometric technique that is used to determine the age of minerals that contain potassium, which include clay minerals and micas. It is most useful for minerals older than 100,000 years and can reach way back into the geological past.
Optical dating, also known as optically stimulated luminescence, dates the last time mineral sediments (usually quartz or feldspar grains), were exposed to sunlight. in the Willandra area it is typically used on quartz sand grains which have been buried and have not been exposed to sunlight since burial. these grains absorb radiation over time from the surrounding sediments and the radiation (electrons) remain trapped within the mineral grain structure. when the grain is exposed to intense light of particular wavelengths in the laboratory, it emits a light signal with an intensity proportional to the radiation it has absorbed while buried
This was the technique that became available for accurate dating of old materials.It uses the fact that natural carbon contains a known radio of ordinary carbon and the radio of ordinary carbon and the radioactive isotope carbon-14, and that this mix is reflected in carbon taken up by living organic materials such as wood, shells and bones. when organisms die, the carbon-14 begins to decay at a known rate.
Thermoluminescence is a similar technique to opitical dating, but uses heat instead of light to stimulate the minerals. the method also assumes a 'zeroing' event in the life of the material, when it was either last heated or exposed to sunlight.
What is the purpose of this artefact?
The purpose of the wallaby trap is to catch wallabies for the tribe to kill and then eat. As the wallaby tries to escape it gets more tightly held in the trap.
How long ago was the first wallaby trap made?
These wallaby traps have been known about since 1435
What is this trap called in indigenous language?
Has this artefact been modified over the years?
It used to be loosely woven and the wallabies used to escape easily. It is now tightly woven and once the wallaby is in it cant get out.
What is this trap made of?
This wallaby trap is made of lawyer cane and is tightly weaved together so that the wallaby can't escape.
Who does this trap belong to?
This trap belongs a tribe in the Cairns region called the Djirrbal Tribe.
Are there any similarities with modern objects?
Most of traps made these days either kill the animals when they walk in the trap or they are made of metal and the door snaps shut when they reach the bait.