Overview and regional maps · 58–59
Isidis
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Chains of mysterious cones and ridges form fingerprint-like patterns in the sediments filling the impact basin. Are they made of lava or other volcanic debris? Are they traces of hot mud volcanism rising from below? Sediments deposited by pressurised flowing water beneath an ice sheet that occupied the basin? Magma forced through ground ice? Researchers still have work to do here.