Illustrated above is a scalloped-margin dome located in the Eistla Region, a tessera terrain of Venus. West is oriented toward the top of the image. This Magellan radar image is 108 km wide (north-south) and 123 km across east-west.
This volanic dome, often called a "tick", is about 35 km across and exhibits a wide apron of sharply defined radial ridges, possibly collapse structures, that extend to form the base of the structure almost 66 km in diameter. These ridges make the dome appear to look like a bottle cap. The terrain on which it lies is cut by numerous north-south trending curvilinear features which wrap around the dome, or cut across the smooth, concave summit.
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