1.   At first we thought it might be an outcrop of magnetic rock, but all the geological evidence was against it.

2.   Geological evidence proves beyond doubt that it is three million years old.

3.   More geological evidence found later proved the theory correct.

4.   The main geological evidence for a major ocean impact would lie in tsunami wave deposits.

5.   And there is abundant geological evidence that exactly such a spike of oxygen did indeed take place, he said.

6.   But the geological evidence points to a hard snowball, Kirschvink said.

7.   But there is ample geological evidence that huge meteoroids have hit the Earth in the distant past, and probably will again.

8.   Geological evidence suggests the disaster resembled the famous eruption of the volcano Vesuvius, which destroyed the town of Pompeii in ancient Roman times.

9.   In recent years, scientists studying the Calaveras have found geological evidence of five or six major quakes on the fault over the last few thousand years.

10.   There is geological evidence that grassland and forest fires, lightning and spontaneous combustion of coal have spawned such fires for hundreds of thousands of years.