Hutton hit on a variety of ideas to explain the rock strata he saw around him.

The northern half of the volcano has since been covered by depositional rock strata.

Connate water is trapped in rock strata at the time of formation.

As a result deep rock strata from the Jurassic period were brought to the surface.

Remains are often found within the rock strata containing mammoth.

A formation consists of a certain number of rock strata.

The rock strata have been dated at between 1.2-1.4 billion years old.

"It's what happens when two layers of rock strata come together."

The rock strata have a general dip towards the south and south-east.

It is likely the rock strata in the walls preserve a long geological history of Mars.