Victoria Annulus, Discusions about Victoria's Apron |
Victoria Annulus, Discusions about Victoria's Apron |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1636 Joined: 9-May 05 From: Lima, Peru Member No.: 385 ![]() |
From today, Oppy will start to head toward the Victoria Crater which is about 500 meters away. The drive would take about one month (that is 15 soles of driven with an average of 33 meters/sol, the other 15 soles would be for other purposes or restrictive soles).
The surface around Victoria Annulus, I seems it won't be as smooth as the way between Eagle and Endurance craters but the surface would have no uniform or parallel wave of sand and dust in small size of ripple. See Phil's Victoria Annulus partial map, Tesheiner's one Victoria Crater picture Otherwise, the surface might have ripples smaller and alike to the ones of El Dorado, on the skirt south side of Columbia Hill. Besides, the Anuulus has no outcrops except to around of few small mini-craters. This is a change of morphology of surface around the Victoria Annulus. What does it explain about this developing kind of surface of sand? Its extension is just around the inside of Victoria's ray of ejection. That is coincidence. Around that has no bigger ripples as the outside of Annulus. The explanation would be that around annulus has smoother rock or outcrop surface, no blocks which had not helped to build ripples by the winds. Other factor, I am not sure, is that the slope from the border of Annulus to crater is positive (going up by few meters), then this might be another factor not to build ripples. I have seen that anywhere in the desert that have a slopes does not have any ripples but only flat surface. Any debate about why the Victoria Annulus does not look like ripples as the outside of Annulus. Rodolfo |
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 ![]() |
"Tektites" or "impact lapilli" are the best name I can come up with. Unlike earthly tekties they are neither appear glassy nor aerodynamic (for the most part) and unlike earthly lapilli they are't volcanic. They are the basaltic basal unit melted by the impact, assuming a near-spherical shape in the thin atmosphere and falling onto the ejecta blanket. I think the observation of the larger-sized spherules in this locale is important. Look at the L257's taken at this stop, the larger spherules tend to have a color similar to the basaltic cobbles, while the smaller spherules have a slightly different color. I see we have new Pancams of this crater and the distinctive light-toned rocks, so perhaps this will not be a drive-by sighting. Although we'd like to get to the photo-ops at Victoria, we need to do some science at this stop. Understanding erosional-depositional processes on Mars is the key to understanding the geomorph.
I agree with the idea that the holes in the berries are related to the stalks we've seen. And I wonder if some of the berries are not hollow or have a "softer" internal composition (related to Aldebaran's "planar inclusions"). I'm thinking that we see more broken berries here because of the impact. When the evaporite was catastrophically fractured and pulverized by the impact some of the berries were broken along the fracture lines, whereas with slower weathering processes the evaporite matrix breaks around the berries. By way of earthly analogy, take a look at the attached... --Bill -------------------- |
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