This caption describes two images that form a stereo-pair, that is often useful to study the same area at different times and to note any differences for further examination. This animated image demonstrates the principle of having a stereo-pair.

In the first HiRISE image of Winslow Crater ( PSP_004313_1760), distinct dark rays surrounding the crater and are consistent with the THEMIS data’s suggestion of rockier materials. V-shaped patterns in the rays — referred to as a “herringbone” pattern — are identical to those around fresh lunar craters. These form when materials are ejected from the crater at a very low angle, which form clusters of secondary craters that preferentially eject materials down-range in a V-shaped pattern. (It‘s the same pattern that you would get when shooting a water pistol nearly parallel to a sidewalk.)

Also noteworthy are the large meter-to-decimeter-sized boulders on the steep rim that have not been buried or physically weathered to smaller sizes in this windy region, indicating that they have not been exposed long. This is also reminiscent of Meteor Crater and examples of fresh simple craters on the Moon.