A WRINKLE RIDGE SEEMS TO DIVIDE the crater Brisbane Z in half. Brisbane Z is a mare-flooded crater within the Mare Australe region of the Moon.
Wrinkle ridges are one of several styles of tectonic deformation present on the Moon, and occur primarily in the maria, or lunar ‘seas’.
Wrinkle ridges are the result of contractional forces, and in the maria, these forces are believed to be from the weight of the basalts poured onto the surface by volcanic activity billions of years ago.
The same reasoning explains why wrinkle ridges are sometimes found in magma-flooded craters, where similar contractional forces are present at a smaller scale.
Adapted from information issued by LRO Team / NASA / GSFC / Arizona State University.
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