What do fossickers do?

the gathering of minerals as a recreation aka mining

Fossickers search for gold, precious stones, fossils in prospective places

Explanation: Fossicking is prospect in places like Australia and New Zealand, especially when carried out as a recreational activity. This can be for gold, precious stones, fossils, etc. by sifting through a prospective area. It can also be referred to as Rummaging

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .

this would be a math