He identified Beta Regio
upon his May 12, 19 and 20 images.
I was able to identify the large features Beta Regio
and Phoebe Regio; both appear quite dark because they're located at several kilometers elevation.
Turcotte notes that chimney-like plumes, which would originate thousands of kilometers beneath the surface, would likely create broad, rounded highlands such as the large equatorial uprising known as Beta Regio
67-68, 2-11 (2007)), in which he agreed with the undersigned that the IR images of the crescent reveal Beta Regio
and Phoebe Regio.
Three exceptions, already in wide use, were retained: Alpha Regio, Beta Regio
, and Maxwell Montes (honoring physicist James Clerk Maxwell).
All of the most severely fractured craters and some of the more moderately fractured ones lie in highly disrupted, upland terrains, such as Aphrodite Terra and Beta Regio
in the equotorial highlands.
Beta Regio, one of the first features on the planet identified as volcanic in origin, may kfber another candidate site for blob tectonics.
A basic tenet of this model is that tectonism and magmatism [the formation of molten material] at Beta Regio and western Aphrodite are dominated by the evolution of plume heads or blobs as they rise to the base of the lithosphere and spread laterally," the authors write in the November GEOPHYSICAL RESEARCH LETTERS.
In the 1970s, planetary scientists suggested Beta Regio
resulted from volcanism.