A spiral pattern observed in lava.
Approximately 5–90 m wide on Mars
Subtypes on Mars
Doubly voluted (like the letter “S”) (majority)
Singly voluted (few)
Mars: It has been proposed that the coils formed from the rotation/twisting of ductile crust on the surface of a large volume of ponded lava in Cerberus Palus, Mars. The lava was likely emitted from the Cerberus Fossae (~300 km NE of Cerberus Palus) and flowed through Athabasca Valles before debouching into Cerberus Palus. Coils are present between large plates of rafted material, interpreted to be pieces of volcanic crust. The inter-plate regions are patterned with lava polygon (small), in addition to the coils. The inter-plate polygonal patterning is nearly ubiquitous, whereas the coils have...