Mapping of Venus
Regional plains (rp)

Regional plains are divided into abundant lower unit (rp, Rusalka Formation) with smooth surface and relatively low radar backscatter and upper unit (rp, Ituana Formation) with also smooth surface, but higher radar albedo. Wrinkle ridges heavily deform the lower unit while moderately deforming the upper unit. The lower unit is heavily tectonized and embayed by lava plains and flows. The younger upper unit is lacking in large heavily tectonized tessera regions.
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