“…”In the past, it was thought the Chasma Boreale canyon formed by melting the bottom of the ice sheet and having the floodwater carve the canyon, or perhaps having winds erode the canyon into the ice sheet from above,” said Byrne. “In this study, we’ve figured out that the canyon has actually always been there and the ice cap grew up on either side of it.”

“The arrangement of the internal layers we see with the radar instrument and the layers exposed on cliffs that we see with HiRISE have allowed us to reconstruct the history of this feature.”

“Nobody realized that there would be such complex structures in the layers,”…” Full Slice

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