1) <span>the solar system and light formed. 2) </span> Earth<span>'s formation, approximately 4,5 billion years ago. 3) </span>the creation of the atmosphere through volcanic out gassing; <span>Earth's primitive atmosphere made a transition to an </span>oxygen<span> rich atmosphere. 4) </span>formation of landmass and oceans. 5) the creation of life; <span> there is evidence of the earliest appearance of eukaryotes.</span>
Although many states have dinosaur sites, so far the states that seem to be the most prolific producers of fossils are Colorado, Utah, Wyoming, and Montana.
