Figure 10.

Steps in reconstructing the original surface to the surface observed today in northern Falga Regio (see also Supporting Information Movie S1). Black polygons are plates, gray polygons are plate boundaries that are no longer active, according to the crosscutting relationships. Arrows show the relative motions necessary to bring the plates to their positions in the next step (cf. Figure 4): red denotes contraction, yellow denotes left‐lateral strike‐slip, and blue denotes extension. Activity generally migrated from north to south over time. Minor extension occurs along several boundaries, mostly early in time. Most of the contraction is along the southern boundary, late in time. Left lateral strike slip in many orientations dominates the reconstruction. Maps are in orthographic projection centered at 60°N, 140°E, and the southernmost plate is held fixed.