Which of the following would NOT be considered evidence of past earth events that could help us determine when those events happened? A.
layers of rock that show a volcanic eruption wiped out most life 250 million years ago

B.
finding a shell fossil in limestone

C.
find a trilobite fossil in a 250 million-year-old rock below a 165 million-year-old dinosaur fossil

D.
determining mammals appeared on earth 240 million years ago

The answer is option D "determining mammals appeared on earth 240 million years ago"

Explanation:

Regardless of appearing to be a generally steady spot, the World's surface has changed significantly over the past 4.6 billion years. Mountains have been constructed and dissolved, mainlands and seas have moved significant stretches, and the Earth has varied from being incredibly cold and totally covered with ice to being warm and without ice. These progressions commonly happen so gradually that they are scarcely distinguishable over the range of a human existence, yet even at right now, the World's surface is moving and evolving. As these progressions have happened, creatures have advanced, and remainders of some have been safeguarded as fossils.