areological drawings

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inspired by the following text from "Geopedia" by Marcia Bjornerud:

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Areology [air-ee-AH-loh-gee]

Wars of the Worlds

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"Areology is the rather ungainly term for the study of the "geology" of Mars (...). Since geology literally means "the science of Earth," the term isn't technically correct when applied to other planets or moons. (...) Although Earth and Mars (and the other planets) share an origin 4.5 billion years ago in the formation of the solar system, the earth-based geological timescale is not a good framework for describing the chapters in Mars's past. (...)  Much of the "action" recorded in the landscapes and rocks on Mars happened in the Hadean eon (4-5-4.0 billion years ago), a time for which there is no surviving rock on Earth and which therefore has no subdivisions on the geologic timescale. By the end of Earth's Archean eon (4.0-2.5 billion years ago), the infancy and childhood of our planet, things were already slowing down on Mars. Its magnetic field shut down and its fading volcanoes could no longer keep up with losses of atmospheric gases to space. At about the time that Earth's plate-tectonic system was becoming established, Mars was already beginning to slide into a cold slumber."

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