Dating is achieved usually by trying to produce an isochron of several minerals within a rock specimen.

The old naturalist had packed away his plants and was bringing in a suitcase full of rock specimens to show to Grebb.

Some of the rock specimens can be viewed as a natural art form as well as a lesson in geology.

There is an avenue of 15 large rock specimens with detailed interpretation panels.

The rock specimens they collected were too young (a few millions of years) to date accurately until the potassium-argon dating method was developed.

The rock specimen is 20 cm across.

This expedition did other scientific work on Funk Island, including the collection of rock specimens.

The robot spent a while examining the discarded machine and selecting rock specimens before it joined him.

His 1,100 mineral and rock specimen formed the basis of the early museum.

Also, we can see the same rock specimens on the upper slopes.