"So far excavation had struck no deeper than a shallow level of rock formation, whose complicated geological structure confused even the most experienced of the planetologists. Once they had driven shafts down to the basalt base — itself indubitably more than a billion years old — they discovered that the deposits immediately above contained carbon of organic origin which showed highly advanced stages of recrystallization. At first the scientists believed this layer to have been the original ocean bed. But then they came upon true coal beds with fossils of a large variety of plant species that could only have existed on the dry land. Little by little they gained a clearer picture of the life forms that had existed at that time on the continent of Regis III." - The Invincible by Stanisław Lem.

Nothing like Earth

"The evolution of life on Regis III must have been going on for approximately several hundred million years. They had also discovered considerable amounts of green algae; this should account for the presence of the oxygen in the atmosphere. (...) However, one organ had been found in the fish specimen for which no corresponding terrestrial structure was known to the examining biologists. This seemed to be a special organ of sense that reacted strongly to minute variations in a magnetic field." - The Invincible by Stanisław Lem

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