Remember, the deeper you go in the rock, the older the fossils and rocks.
Fossils don't just show differences in climate but can also show changes in life conditions.
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In short, we'd be looking at the climate of the fossils in question. Likely, you'd expect to find the ferns in a hot climate and the pine needles in a cooler region.
At the bottom of the strata, or rock layer, that you're looking at, you notice a lot of tropical ferns as fossils. As such, this is probably a pretty good indication that there was some significant level of climate change to allow for this to happen.
Free 5-day trial How can something that died tens of millions of years ago help people in the present day understand the past?
In the case of fossils, these long-dead specimens can be perfect clues for figuring out changes in environment and life conditions.
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Without going into too much detail, these offer some pretty valuable hints about what life on Earth was like in the distant past.