Scalloped margin dome

The margins of these domes have arcuate headscarps or 'scallops' separated by ridges that are a consequence of adjoining scallops.

Sometimes debris or slumping can be found at the bottom of these scarps or scattered many tens of kilometers away.

There is another theory that the radial ridges of scalloped margin domes are volcanic dikes.

During the first month of data from the Magellan spacecraft, the first of these features was found to the northeast of Alpha Regio, on Venus.

Its concavity was likely confused as domelike as a tick's body, instead of the actuality which is that it is a bowl-shaped depression.