Spiders in Manhattan

After ice sublimates and erupts, thin debris falls to the surface of the ice in dark fan-shaped deposits, oriented by the wind blowing at the time of the eruption. The surface below the ice is eroded into channels known as araneiform terrain, colloquially called “spiders.”

https://uahirise.org/hipod/ESP_082142_0935
NASA/JPL-Caltech/University of Arizona
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