Geschichte: It's actually a pity that students in Earth Sciences at ETH Zurich haven't been offered any excursions to the west of England. In Somerset, in particular between Bath and Radstock, you can walk through a sequence of layers from Carboniferous to Cretaceous sediments. That's what I did, aiming to assign the fossils I found to the different periods.
Geologie: This rock contains a branch of a petrified fern. The fern is probably from the Carboniferous period, meaning it is about 300 to 350 million years old. At that time, the climate was much warmer and Earth was mostly covered with rain forests. Some plants were quickly burried by mud after they died and thereby got preserved as fossils. Such fossils can help us to understand past climate.
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