Explain radiometric dating fossils

When someone mentions scientific dating methods, the first thing to come to mind for most people is carbon dating.

However, there are many methods that can be used to determine the age of the earth or other objects.

There are three main assumptions that must be made to accept radiometric dating methods.

The sediment of this area was laid down after ammonite A appeared 199 million years ago, and before ammonite B became extinct 195 million years ago.

This narrows the date of the delta beds to the four million years between these dates.

Ammonites, shelled relatives of today’s octopus, make ideal index fossils.

Suppose a dinosaur fossil has been found in the beds of an ancient delta (the mouth of a river leading to the sea).

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