Paul Byrne @theplanetaryguy.com · Jun 14 We know they occupy about 7% of the planet surface; in this map they're the coloured stuff. Most tessera exposures are in the northern hemisphere. There are lots of small bits of them, but two major parts: Aphrodite Terra, along the equator in the eastern hemisphere, and Ishtar Terra in the north.
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Here, it's important to note that "tessera" isn't a geological term used ANYWHERE ELSE except for Venus. We don't use that word in Earth geology, for example. And it just means "tectonically fucked up rock". It doesn't say anything about rock type, or timing/means of deformation, or anything else.