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Scalloped topography

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a small impact, local darkening, erosion, or cracks from thermal contraction. Cracks are common in ice-rich ground on the Earth. Their model predicts that these scalloped depression will develop when the ground has large amounts of pure ice, up to many tens of meters in depth. So, scalloped features can serve as markers for large deposits of pure ice. Ice in and around scalloped topography is not just in the pore spaces of the ground it is excess ice, probably 99% pure as was found by the
512: 441: 4784: 161: 4772: 4760: 337: 172:, or the dielectric constant was determined. That was found from the amount of penetration of the radar to a reflector at the bottom of the ice-rich layer. The depth to the reflector was found by examining high resolution photos of the location. Certain places had gaps or windows in the ice rich layer. 176:
topographic maps then told the depth. The top of the ice-rich layer displayed polygons, scalloped depressions, and exhuming craters all of which are believed to indicate ice. At the bottom of the gap was a totally different surface of a different color and full of craters; this was the reflector seen
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A study published in Icarus, found that the landforms of scalloped topography can be made by the subsurface loss of water ice by sublimation under current Martian climate conditions over periods of tens of thousands of Mars years. Scalloped depressions are thought to begin with a small trigger like
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In Utopia Planitia, a series of curvilinear ridges parallel to the scarp are etched on the floor of large scalloped depressions, possibly representing different stages of scarp erosion. Recently, other researchers have advanced an idea that the ridges represent the tops of layers. Sometimes the
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and Amphitrites Paterae in the southern hemisphere. Such topography consists of shallow, rimless depressions with scalloped edges, commonly referred to as "scalloped depressions" or simply "scallops". Scalloped depressions can be isolated or clustered and sometimes seem to coalesce. A typical
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areas on Earth. Scalloped terrains in Utopia Planitia display polygonal features of different sizes: small (about 5–10 m across) on the scarp, and larger (30–50 m across) on the surrounding terrains. These scale differences may indicate local difference in ground ice concentrations.
43:(direct transition of a material from the solid to the gas phase with no intermediate liquid stage). This process may still be happening at present. This topography may be of great importance for future colonization of Mars because it may point to deposits of pure ice. 357: 664:
Morgenstern A, Hauber E, Reiss D, van Gasselt S, Grosse G, Schirrmeister L (2007): Deposition and degradation of a volatile-rich layer in Utopia Planitia, and implications for climate history on Mars. Journal of Geophysical Research: Planets 112,
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Stuurman, C., et al. 2016. SHARAD reflectors in Utopia Planitia, SHARAD detection and characterization of subsurface water ice deposits in Utopia Planitia, Mars. Geophysical Research Letters, Volume 43, Issue 18, 28 September 2016, Pages
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rock which is widespread on Mars would yield 8. So using a ternary diagram from a paper by Ali Bramson et al., the researchers decided the ice-rich layer was a mixture composed of 50–80% water ice, 0–30% rocky content, and 15–50% porosity.
407: 233: 87:", characterized by a regular pattern of polygonal fractures. These patterns indicate that the surface has undergone stress, perhaps caused by subsidence, desiccation, or thermal contraction. Such patterns are common in 213: 302:
Close-up of scalloped ground, as seen by HiRISE under HiWish program. Surface is divided into polygons; these forms are common where ground freezes and thaws. Note: this is an enlargement of a previous
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Possible variation of scalloped terrain in depressions with straight southern walls, as seen by HiRISE under HiWish program. Box indicates part enlarged in images below. Image located in
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SHARAD finds ice by measuring its radar returns from the surface and from a deeper lower surface. The depth to the lower surface was found from HiRISE images of gaps in the surface.
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Stuurman, C., et al. 2016. SHARAD detection and characterization of subsurface water ice deposits in Utopia Planitia, Mars. Geophysical Research Letters: 43, 9484_9491.
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Soare, R., et al. 2016. Ice-rich (periglacial) vs icy (glacial) depressions in the Argyre region, Mars: a proposed cold-climate dichotomy of landforms: 282, 70-83.
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Enlargement of above image of straight walled depression, as seen by HiRISE under HiWish program. Note that the southern wall is dark compared to the northern wall.
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scalloped depression displays a gentle equator-facing slope and a steeper pole-facing scarp. This topographic asymmetry is probably due to differences in
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in the radar returns. The dielectric constant, averaged over the entire area, came out to be 2.8. Solid water ice would have a dielectric of 3.0–3.2.
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Scalloped terrain labeled with both low center polygons and high center polygons, as seen by HiRISE under HiWish program Image enlarged with HiView.
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The details on the formation of scalloped topography still being worked out. One study, published in 2016 in Icarus proposes a five step process.
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over the image to see the names of over 60 prominent geographic features, and click to link to them. Coloring of the base map indicates relative
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Lefort, A.; Russell, P.; Thomas, N. (2009). "Scalloped terrains in the Peneus and Amphitrites Paterae region of Mars as observed by HiRISE".
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can detect ice-rich layers only when thicker than 10–20 meters over wide areas; it has discovered ice in the region of scalloped topography.
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The calculations for the volume of water ice in the region were based on measurements from the ground-penetrating radar instrument on
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in the Utopia Planitia region of Mars. The volume of water detected has been estimated to be equivalent to the volume of water in
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Stuurman, C., et al. 2014. "Sharad reflectors in Utopia Planitia, Mars consistent with widespread, thick subsurface ice".
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Bramson, A, et al. 2015. Widespread excess ice in Arcadia Planitia, Mars. Geophysical Research Letters: 42, 6566-6574
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Sejourne, A.; et al. (2012). "Evidence of an eolian ice-rich and stratified permafrost in Utopia Planitia, Mars".
4809: 1804: 39:. Scalloped depressions are believed to form from the removal of subsurface material, possibly interstitial ice, by 4664: 3514: 124: 3519: 1536: 1195: 1081: 489: 2968: 2955: 1211: 4122: 389:
Low center polygons, shown with arrows, as seen by HiRISE under HiWish program Image was enlarged with HiView.
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High center polygons, shown with arrows, as seen by HiRISE under HiWish program. Image enlarged with HiView.
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With another tilt change the climate changes and masses of ice sublimate, resulting in scalloped depressions.
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Major changes in the planet’s tilt change the climate. This climate change causes an icy mantle to form.
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of Mars, between 45° and 60° north and south. It is particularly prominent in the region of
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Lefort, A.; Russell, P.; Thomas, N.; McEwen, A.S.; Dundas, C.M.; Kirk, R.L. (2009).
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Meltwater moves in the ground, at least to the depth of the scalloped depressions.
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Scalloped terrain, as seen by HiRISE under HiWish program The location is the
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Further enlargement of above image, as seen by HiRISE under HiWish program.
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Periglacial Scallops and polygons, as seen by HiRISE under HiWish program.
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Zanetti, M., Hiesinger, H., Reiss, D., Hauber, E. and Neukum, G. (2009),
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Freezing and thawing of the ice produces masses of ice (ice lenses).
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surface around scalloped terrain or scalloped topography displays "
1082:"Lake of frozen water the size of New Mexico found on Mars – NASA" 898:"Compositions of subsurface ices at the Mars Phoenix landing site" 2027: 1333: 626:"HiRISE observations of periglacial landforms in Utopia Planitia" 511: 3209: 1724: 243: 220: 200: 178: 154: 52: 223:, showing patterned ground and scalloped topography. Image in 100:
On November 22, 2016, NASA reported finding a large amount of
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Stages in scallop formation, as seen by HiRISE. Location is
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Scalloped ground, as seen by HiRISE under HiWish program.
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Scalloped ground, as seen by HiRISE under HiWish program.
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Various conditions cause the mantle to thaw or evaporate.
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Close up of scalloped ground, as seen by HiRISE under
4748: 541:. Whites and browns indicate the highest elevations ( 674: 30:, in the northern hemisphere, and in the region of 760: 16:Depressions in topography at mid-latitudes of Mars 1210: 756: 754: 553:; greens and blues are lower elevations (down to 4796: 1100: 443: 199:Scalloped terrain at Peneus Patera, as seen by 95: 751: 738:"Scalloped Topography in Peneus Patera Crater" 1196: 1074: 1046: 1130:45th Lunar and Planetary Science Conference 761:Dundas, C.; Bryrne, S.; McEwen, A. (2015). 1203: 1189: 962: 921: 880: 649: 996: 439: 219:Periglacial forms in Utopia, as seen by 159: 434: 4797: 1035:. HiRISE Operations Center. 2007-02-28 854: 740:. HiRISE Operations Center. 2007-02-28 619: 617: 615: 2075: 1522: 1230: 1184: 1052: 799: 895: 168:From the data obtained from SHARAD, 936: 612: 13: 14: 4821: 2023:Martian meteorites found on Earth 800:Smith, P.; et al. (2009). "H 51:. The shallow Subsurface Radar ( 4782: 4770: 4758: 855:Mellon, M.; et al. (2009). 804:O at the Phoenix landing site". 510: 418: 406: 394: 382: 368: 356: 336: 324: 308: 295: 283: 267: 255: 232: 212: 192: 135: 123: 1231: 1169: 1144: 1135: 1122: 1025: 990: 981: 971: 930: 889: 630:Journal of Geophysical Research 545:); followed by pinks and reds ( 2076: 848: 793: 730: 716: 703: 668: 658: 1: 937:Seu, R.; et al. (2007). 896:Cull, S; et al. (2010). 606: 787:10.1016/j.icarus.2015.07.033 697:10.1016/j.icarus.2009.06.005 533:Mars Orbiter Laser Altimeter 96:Detection of underground ice 7: 1523: 1053:Staff (November 22, 2016). 151:Mars Reconnaissance Orbiter 57:Mars Reconnaissance Orbiter 10: 4826: 1442:Mare Australe (South Pole) 185: 3515:Eagle (Acidalia Planitia) 3165: 2954: 2468: 2318: 2086: 2082: 2071: 1815: 1805:Classical albedo features 1760: 1535: 1531: 1518: 1347: 1241: 1237: 1226: 1110:. NASA. 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Geophys. Res 935: 931: 894: 890: 861:J. Geophys. Res 853: 849: 812:(5936): 58–61. 803: 798: 794: 759: 752: 743: 741: 736: 735: 731: 722: 721: 717: 708: 704: 673: 669: 663: 659: 622: 613: 609: 603: 601: 598: 579:Mars Rovers map 575: 554: 550: 546: 542: 524: 509: 507: 440: 437: 430: 423: 414: 411: 402: 399: 390: 387: 376: 373: 364: 361: 352: 341: 332: 329: 320: 313: 304: 300: 291: 288: 279: 272: 263: 260: 251: 237: 228: 217: 208: 197: 188: 147: 146: 145: 144: 143: 140: 132: 131: 130:Martian terrain 128: 119: 118: 102:underground ice 98: 49:Phoenix mission 28:Utopia Planitia 17: 12: 11: 5: 4823: 4813: 4812: 4807: 4792: 4791: 4779: 4767: 4744: 4743: 4740: 4739: 4736: 4735: 4733: 4732: 4727: 4722: 4717: 4712: 4707: 4702: 4697: 4692: 4687: 4682: 4677: 4672: 4667: 4662: 4657: 4652: 4647: 4642: 4637: 4636: 4635: 4625: 4620: 4615: 4610: 4605: 4600: 4595: 4590: 4585: 4580: 4575: 4570: 4565: 4560: 4555: 4550: 4545: 4540: 4535: 4530: 4525: 4520: 4515: 4510: 4505: 4500: 4495: 4490: 4485: 4480: 4475: 4470: 4465: 4460: 4455: 4450: 4445: 4440: 4435: 4430: 4425: 4420: 4415: 4410: 4405: 4400: 4395: 4390: 4385: 4380: 4375: 4370: 4365: 4360: 4355: 4350: 4345: 4340: 4335: 4330: 4325: 4320: 4315: 4310: 4305: 4300: 4295: 4290: 4285: 4280: 4275: 4270: 4265: 4260: 4255: 4250: 4245: 4240: 4235: 4230: 4225: 4220: 4215: 4210: 4205: 4200: 4195: 4190: 4185: 4180: 4175: 4170: 4165: 4160: 4155: 4150: 4145: 4140: 4135: 4130: 4125: 4120: 4115: 4110: 4105: 4100: 4095: 4090: 4085: 4080: 4075: 4070: 4065: 4060: 4055: 4050: 4045: 4040: 4035: 4030: 4025: 4020: 4015: 4010: 4005: 4000: 3995: 3990: 3985: 3980: 3975: 3970: 3965: 3960: 3955: 3950: 3945: 3940: 3935: 3930: 3925: 3920: 3915: 3910: 3905: 3900: 3895: 3890: 3885: 3880: 3875: 3870: 3865: 3863:Jarry-Desloges 3860: 3855: 3850: 3845: 3840: 3835: 3830: 3825: 3820: 3815: 3810: 3805: 3800: 3795: 3790: 3785: 3780: 3775: 3770: 3765: 3760: 3755: 3750: 3745: 3740: 3735: 3734: 3733: 3728: 3727: 3726: 3721: 3714:Columbia Hills 3711: 3710: 3709: 3704: 3699: 3692:Apollo 1 Hills 3684: 3679: 3674: 3669: 3664: 3659: 3654: 3649: 3644: 3639: 3634: 3629: 3624: 3619: 3614: 3609: 3604: 3599: 3594: 3589: 3584: 3579: 3574: 3569: 3564: 3559: 3554: 3553: 3552: 3550:Matijevic Hill 3542: 3537: 3532: 3527: 3522: 3517: 3512: 3507: 3502: 3497: 3492: 3487: 3482: 3477: 3472: 3467: 3462: 3457: 3452: 3447: 3442: 3437: 3432: 3427: 3422: 3417: 3412: 3407: 3402: 3397: 3392: 3387: 3382: 3377: 3372: 3367: 3362: 3357: 3352: 3347: 3342: 3337: 3332: 3327: 3322: 3317: 3312: 3307: 3302: 3297: 3292: 3287: 3282: 3277: 3272: 3267: 3262: 3257: 3252: 3247: 3242: 3237: 3232: 3227: 3222: 3217: 3212: 3207: 3202: 3197: 3192: 3190:Tractus Catena 3187: 3182: 3180:Artynia Catena 3176: 3174: 3163: 3162: 3160: 3159: 3154: 3149: 3144: 3139: 3134: 3132:Claritas Rupes 3129: 3124: 3119: 3114: 3109: 3104: 3102:Cydonia Mensae 3099: 3094: 3089: 3084: 3082:Ulysses Fossae 3079: 3077:Tractus Fossae 3074: 3069: 3064: 3059: 3057:Sirenum Fossae 3054: 3049: 3044: 3039: 3034: 3032:Medusae Fossae 3029: 3024: 3019: 3014: 3009: 3004: 3002:Elysium Fossae 2999: 2994: 2989: 2984: 2979: 2973: 2971: 2952: 2951: 2949: 2948: 2947: 2946: 2941: 2936: 2931: 2930: 2929: 2919: 2914: 2909: 2904: 2899: 2894: 2889: 2884: 2879: 2874: 2869: 2864: 2859: 2854: 2849: 2844: 2839: 2834: 2829: 2824: 2819: 2814: 2809: 2804: 2799: 2794: 2789: 2784: 2783: 2782: 2772: 2767: 2762: 2757: 2752: 2747: 2742: 2737: 2732: 2727: 2722: 2717: 2712: 2707: 2702: 2697: 2692: 2687: 2682: 2677: 2672: 2667: 2662: 2657: 2652: 2647: 2642: 2637: 2632: 2627: 2622: 2617: 2612: 2605:List of valles 2601: 2600: 2595: 2590: 2585: 2580: 2575: 2570: 2565: 2560: 2558:Hydaspis Chaos 2555: 2550: 2548:Gorgonum Chaos 2545: 2540: 2538:Galaxias Chaos 2535: 2530: 2525: 2520: 2515: 2513:Chasma Boreale 2510: 2505: 2500: 2498:Atlantis Chaos 2495: 2493:Aromatum Chaos 2490: 2488:Arsia Chasmata 2485: 2479: 2477: 2466: 2465: 2463: 2462: 2457: 2455:Pityusa Patera 2452: 2447: 2442: 2437: 2432: 2427: 2422: 2417: 2412: 2407: 2402: 2397: 2392: 2387: 2382: 2377: 2372: 2367: 2362: 2357: 2352: 2347: 2342: 2337: 2332: 2326: 2324: 2316: 2315: 2313: 2312: 2311: 2310: 2308:Uranius Tholus 2305: 2300: 2290: 2288:Ulysses Tholus 2285: 2283:Tyrrhenus Mons 2280: 2278:Tharsis Tholus 2275: 2274: 2273: 2268: 2263: 2256:Tharsis Montes 2253: 2248: 2243: 2238: 2236:Phlegra Montes 2233: 2228: 2223: 2218: 2213: 2208: 2203: 2201:Hadriacus Mons 2198: 2193: 2188: 2187: 2186: 2184:Hecates Tholus 2181: 2176: 2166: 2161: 2156: 2151: 2146: 2144:Avernus Colles 2141: 2139:Ausonia Montes 2136: 2134:Astapus Colles 2131: 2126: 2121: 2116: 2111: 2105: 2103: 2099:list by height 2096: 2080: 2079: 2069: 2068: 2065: 2064: 2061: 2060: 2058: 2057: 2056: 2055: 2050: 2045: 2040: 2035: 2030: 2019: 2018: 2017: 2016: 2014:Shelter Island 2011: 2006: 2001: 1996: 1991: 1980: 1979: 1978: 1977: 1972: 1964: 1963: 1962: 1954: 1953: 1952: 1947: 1942: 1937: 1924: 1923: 1922: 1917: 1904: 1903: 1902: 1897: 1892: 1879: 1878: 1877: 1872: 1867: 1862: 1857: 1855:Jake Matijevic 1852: 1847: 1842: 1837: 1835:Bathurst Inlet 1823: 1821: 1813: 1812: 1810: 1809: 1808: 1807: 1802: 1787: 1782: 1777: 1772: 1766: 1764: 1758: 1757: 1755: 1754: 1749: 1748: 1747: 1737: 1732: 1727: 1722: 1717: 1712: 1707: 1702: 1697: 1695:Seasonal flows 1692: 1687: 1685:Rootless cones 1682: 1677: 1672: 1667: 1662: 1657: 1652: 1647: 1641: 1636: 1631: 1626: 1621: 1616: 1611: 1606: 1601: 1600: 1599: 1594: 1584: 1579: 1574: 1569: 1564: 1559: 1554: 1549: 1543: 1541: 1529: 1528: 1516: 1515: 1512: 1511: 1508: 1507: 1505: 1504: 1499: 1494: 1489: 1484: 1479: 1474: 1469: 1464: 1459: 1454: 1452:Mare Tyrrhenum 1449: 1444: 1439: 1437:Mare Acidalium 1434: 1429: 1427:Ismenius Lacus 1424: 1419: 1414: 1409: 1404: 1399: 1394: 1389: 1384: 1379: 1374: 1369: 1364: 1359: 1353: 1351: 1345: 1344: 1342: 1341: 1336: 1331: 1326: 1324:Terra Cimmeria 1321: 1316: 1311: 1306: 1301: 1296: 1291: 1286: 1281: 1276: 1271: 1266: 1261: 1256: 1254:Aspledon Undae 1251: 1245: 1243: 1235: 1234: 1224: 1223: 1208: 1207: 1200: 1193: 1185: 1178: 1177: 1168: 1143: 1134: 1121: 1099: 1073: 1045: 1024: 1005:(1): 248–254. 989: 980: 970: 949:(E5): E05S05. 929: 908:(24): L24203. 888: 867:(53): E00E07. 847: 801: 792: 750: 729: 715: 702: 683:(1): 259–268. 667: 657: 636:(E4): E04005. 610: 608: 605: 574: 438: 436: 433: 432: 431: 424: 417: 415: 412: 405: 403: 400: 393: 391: 388: 381: 378: 377: 374: 367: 365: 362: 355: 353: 342: 335: 333: 330: 323: 321: 314: 307: 305: 301: 294: 292: 289: 282: 280: 276:HiWish program 273: 266: 264: 261: 254: 252: 238: 231: 229: 218: 211: 209: 198: 191: 187: 184: 142:Map of terrain 141: 134: 133: 129: 122: 121: 120: 113: 112: 111: 110: 97: 94: 80: 79: 76: 73: 70: 67: 55:), aboard the 15: 9: 6: 4: 3: 2: 4822: 4811: 4808: 4806: 4803: 4802: 4800: 4790: 4785: 4780: 4778: 4768: 4766: 4756: 4755: 4752: 4731: 4728: 4726: 4723: 4721: 4718: 4716: 4713: 4711: 4708: 4706: 4703: 4701: 4698: 4696: 4693: 4691: 4688: 4686: 4683: 4681: 4678: 4676: 4673: 4671: 4668: 4666: 4663: 4661: 4658: 4656: 4653: 4651: 4648: 4646: 4643: 4641: 4638: 4634: 4631: 4630: 4629: 4626: 4624: 4621: 4619: 4616: 4614: 4611: 4609: 4606: 4604: 4601: 4599: 4596: 4594: 4591: 4589: 4586: 4584: 4581: 4579: 4576: 4574: 4571: 4569: 4566: 4564: 4561: 4559: 4556: 4554: 4551: 4549: 4546: 4544: 4541: 4539: 4536: 4534: 4531: 4529: 4526: 4524: 4521: 4519: 4516: 4514: 4511: 4509: 4506: 4504: 4501: 4499: 4496: 4494: 4491: 4489: 4486: 4484: 4481: 4479: 4476: 4474: 4471: 4469: 4466: 4464: 4461: 4459: 4456: 4454: 4451: 4449: 4446: 4444: 4441: 4439: 4436: 4434: 4431: 4429: 4426: 4424: 4421: 4419: 4416: 4414: 4411: 4409: 4406: 4404: 4401: 4399: 4396: 4394: 4391: 4389: 4386: 4384: 4381: 4379: 4376: 4374: 4371: 4369: 4366: 4364: 4361: 4359: 4356: 4354: 4351: 4349: 4346: 4344: 4341: 4339: 4336: 4334: 4331: 4329: 4326: 4324: 4321: 4319: 4316: 4314: 4311: 4309: 4306: 4304: 4301: 4299: 4296: 4294: 4291: 4289: 4286: 4284: 4281: 4279: 4276: 4274: 4271: 4269: 4266: 4264: 4261: 4259: 4256: 4254: 4251: 4249: 4246: 4244: 4241: 4239: 4236: 4234: 4231: 4229: 4226: 4224: 4221: 4219: 4216: 4214: 4211: 4209: 4206: 4204: 4201: 4199: 4196: 4194: 4191: 4189: 4186: 4184: 4181: 4179: 4176: 4174: 4171: 4169: 4166: 4164: 4161: 4159: 4156: 4154: 4151: 4149: 4146: 4144: 4141: 4139: 4136: 4134: 4131: 4129: 4126: 4124: 4121: 4119: 4116: 4114: 4111: 4109: 4106: 4104: 4101: 4099: 4096: 4094: 4091: 4089: 4086: 4084: 4081: 4079: 4076: 4074: 4071: 4069: 4066: 4064: 4061: 4059: 4056: 4054: 4051: 4049: 4046: 4044: 4041: 4039: 4036: 4034: 4031: 4029: 4026: 4024: 4021: 4019: 4016: 4014: 4011: 4009: 4006: 4004: 4001: 3999: 3996: 3994: 3991: 3989: 3986: 3984: 3981: 3979: 3976: 3974: 3971: 3969: 3966: 3964: 3961: 3959: 3956: 3954: 3951: 3949: 3946: 3944: 3941: 3939: 3936: 3934: 3931: 3929: 3926: 3924: 3921: 3919: 3916: 3914: 3911: 3909: 3906: 3904: 3901: 3899: 3896: 3894: 3891: 3889: 3886: 3884: 3881: 3879: 3876: 3874: 3871: 3869: 3866: 3864: 3861: 3859: 3856: 3854: 3851: 3849: 3846: 3844: 3841: 3839: 3836: 3834: 3831: 3829: 3826: 3824: 3821: 3819: 3816: 3814: 3811: 3809: 3806: 3804: 3801: 3799: 3796: 3794: 3791: 3789: 3786: 3784: 3781: 3779: 3776: 3774: 3771: 3769: 3766: 3764: 3761: 3759: 3756: 3754: 3751: 3749: 3746: 3744: 3741: 3739: 3736: 3732: 3731:Sleepy Hollow 3729: 3725: 3722: 3720: 3717: 3716: 3715: 3712: 3708: 3705: 3703: 3700: 3698: 3695: 3694: 3693: 3690: 3689: 3688: 3685: 3683: 3680: 3678: 3675: 3673: 3670: 3668: 3665: 3663: 3660: 3658: 3655: 3653: 3650: 3648: 3645: 3643: 3640: 3638: 3635: 3633: 3630: 3628: 3625: 3623: 3620: 3618: 3615: 3613: 3610: 3608: 3605: 3603: 3600: 3598: 3595: 3593: 3590: 3588: 3585: 3583: 3580: 3578: 3575: 3573: 3570: 3568: 3565: 3563: 3560: 3558: 3555: 3551: 3548: 3547: 3546: 3543: 3541: 3538: 3536: 3533: 3531: 3528: 3526: 3523: 3521: 3518: 3516: 3513: 3511: 3508: 3506: 3503: 3501: 3498: 3496: 3493: 3491: 3488: 3486: 3483: 3481: 3478: 3476: 3473: 3471: 3468: 3466: 3463: 3461: 3458: 3456: 3453: 3451: 3448: 3446: 3443: 3441: 3438: 3436: 3433: 3431: 3428: 3426: 3423: 3421: 3418: 3416: 3413: 3411: 3408: 3406: 3403: 3401: 3398: 3396: 3393: 3391: 3388: 3386: 3383: 3381: 3378: 3376: 3373: 3371: 3368: 3366: 3363: 3361: 3358: 3356: 3353: 3351: 3348: 3346: 3343: 3341: 3338: 3336: 3333: 3331: 3328: 3326: 3323: 3321: 3318: 3316: 3313: 3311: 3308: 3306: 3303: 3301: 3298: 3296: 3293: 3291: 3288: 3286: 3283: 3281: 3278: 3276: 3273: 3271: 3268: 3266: 3263: 3261: 3258: 3256: 3253: 3251: 3248: 3246: 3243: 3241: 3238: 3236: 3233: 3231: 3228: 3226: 3223: 3221: 3218: 3216: 3213: 3211: 3208: 3206: 3203: 3201: 3198: 3196: 3193: 3191: 3188: 3186: 3183: 3181: 3178: 3177: 3175: 3173: 3168: 3164: 3158: 3155: 3153: 3150: 3148: 3145: 3143: 3142:Olympus Rupes 3140: 3138: 3135: 3133: 3130: 3128: 3125: 3123: 3120: 3118: 3115: 3113: 3110: 3108: 3105: 3103: 3100: 3098: 3095: 3093: 3092:Ausonia Mensa 3090: 3088: 3087:Aeolis Mensae 3085: 3083: 3080: 3078: 3075: 3073: 3070: 3068: 3065: 3063: 3060: 3058: 3055: 3053: 3050: 3048: 3045: 3043: 3040: 3038: 3035: 3033: 3030: 3028: 3025: 3023: 3022:Mangala Fossa 3020: 3018: 3015: 3013: 3012:Icaria Fossae 3010: 3008: 3005: 3003: 3000: 2998: 2995: 2993: 2990: 2988: 2985: 2983: 2980: 2978: 2975: 2974: 2972: 2970: 2966: 2961: 2957: 2953: 2945: 2942: 2940: 2937: 2935: 2932: 2928: 2925: 2924: 2923: 2920: 2918: 2915: 2913: 2910: 2908: 2905: 2903: 2900: 2898: 2895: 2893: 2890: 2888: 2885: 2883: 2880: 2878: 2875: 2873: 2870: 2868: 2865: 2863: 2860: 2858: 2855: 2853: 2850: 2848: 2845: 2843: 2840: 2838: 2835: 2833: 2830: 2828: 2825: 2823: 2820: 2818: 2815: 2813: 2810: 2808: 2805: 2803: 2800: 2798: 2795: 2793: 2790: 2788: 2785: 2781: 2778: 2777: 2776: 2773: 2771: 2768: 2766: 2763: 2761: 2758: 2756: 2753: 2751: 2748: 2746: 2743: 2741: 2738: 2736: 2733: 2731: 2728: 2726: 2723: 2721: 2718: 2716: 2713: 2711: 2708: 2706: 2703: 2701: 2698: 2696: 2693: 2691: 2688: 2686: 2683: 2681: 2678: 2676: 2673: 2671: 2668: 2666: 2663: 2661: 2658: 2656: 2653: 2651: 2648: 2646: 2643: 2641: 2638: 2636: 2633: 2631: 2628: 2626: 2623: 2621: 2618: 2616: 2613: 2611: 2608: 2607: 2606: 2603: 2602: 2599: 2596: 2594: 2591: 2589: 2586: 2584: 2581: 2579: 2576: 2574: 2571: 2569: 2566: 2564: 2561: 2559: 2556: 2554: 2551: 2549: 2546: 2544: 2543:Ganges Chasma 2541: 2539: 2536: 2534: 2531: 2529: 2526: 2524: 2521: 2519: 2516: 2514: 2511: 2509: 2508:Candor Chasma 2506: 2504: 2501: 2499: 2496: 2494: 2491: 2489: 2486: 2484: 2481: 2480: 2478: 2476: 2471: 2467: 2461: 2458: 2456: 2453: 2451: 2450:Peneus Patera 2448: 2446: 2443: 2441: 2438: 2436: 2433: 2431: 2428: 2426: 2423: 2421: 2420:Planum Boreum 2418: 2416: 2413: 2411: 2408: 2406: 2403: 2401: 2398: 2396: 2393: 2391: 2390:Icaria Planum 2388: 2386: 2383: 2381: 2378: 2376: 2373: 2371: 2368: 2366: 2363: 2361: 2358: 2356: 2353: 2351: 2348: 2346: 2343: 2341: 2338: 2336: 2333: 2331: 2328: 2327: 2325: 2323: 2317: 2309: 2306: 2304: 2301: 2299: 2296: 2295: 2294: 2293:Uranius group 2291: 2289: 2286: 2284: 2281: 2279: 2276: 2272: 2269: 2267: 2264: 2262: 2259: 2258: 2257: 2254: 2252: 2249: 2247: 2244: 2242: 2239: 2237: 2234: 2232: 2229: 2227: 2224: 2222: 2219: 2217: 2214: 2212: 2209: 2207: 2206:Hellas Montes 2204: 2202: 2199: 2197: 2196:Galaxius Mons 2194: 2192: 2191:Erebus Montes 2189: 2185: 2182: 2180: 2177: 2175: 2172: 2171: 2170: 2167: 2165: 2162: 2160: 2157: 2155: 2152: 2150: 2149:Biblis Tholus 2147: 2145: 2142: 2140: 2137: 2135: 2132: 2130: 2127: 2125: 2122: 2120: 2117: 2115: 2112: 2110: 2107: 2106: 2104: 2100: 2094: 2089: 2085: 2081: 2074: 2070: 2054: 2051: 2049: 2046: 2044: 2041: 2039: 2036: 2034: 2031: 2029: 2026: 2025: 2024: 2021: 2020: 2015: 2012: 2010: 2009:Oileán Ruaidh 2007: 2005: 2002: 2000: 1997: 1995: 1992: 1990: 1987: 1986: 1985: 1982: 1981: 1976: 1973: 1971: 1968: 1967: 1965: 1961: 1958: 1957: 1955: 1951: 1948: 1946: 1943: 1941: 1938: 1936: 1933: 1932: 1931: 1929: 1925: 1921: 1918: 1916: 1915:Barnacle Bill 1913: 1912: 1911: 1909: 1905: 1901: 1898: 1896: 1893: 1891: 1888: 1887: 1886: 1884: 1880: 1876: 1873: 1871: 1868: 1866: 1863: 1861: 1858: 1856: 1853: 1851: 1848: 1846: 1843: 1841: 1838: 1836: 1833: 1832: 1831: 1829: 1825: 1824: 1822: 1820: 1814: 1806: 1803: 1800: 1796: 1793: 1792: 1791: 1788: 1786: 1783: 1781: 1778: 1776: 1773: 1771: 1768: 1767: 1765: 1763: 1759: 1753: 1750: 1746: 1743: 1742: 1741: 1738: 1736: 1733: 1731: 1728: 1726: 1723: 1721: 1718: 1716: 1713: 1711: 1708: 1706: 1703: 1701: 1698: 1696: 1693: 1691: 1688: 1686: 1683: 1681: 1678: 1676: 1673: 1671: 1668: 1666: 1665:Ore resources 1663: 1661: 1658: 1656: 1653: 1651: 1648: 1645: 1642: 1640: 1637: 1635: 1632: 1630: 1627: 1625: 1622: 1620: 1617: 1615: 1612: 1610: 1607: 1605: 1602: 1598: 1595: 1593: 1590: 1589: 1588: 1585: 1583: 1580: 1578: 1575: 1573: 1570: 1568: 1565: 1563: 1560: 1558: 1557:Chaos terrain 1555: 1553: 1550: 1548: 1547:Brain terrain 1545: 1544: 1542: 1540: 1534: 1530: 1526: 1521: 1517: 1503: 1500: 1498: 1495: 1493: 1490: 1488: 1487:Sinus Sabaeus 1485: 1483: 1480: 1478: 1475: 1473: 1470: 1468: 1465: 1463: 1460: 1458: 1455: 1453: 1450: 1448: 1445: 1443: 1440: 1438: 1435: 1433: 1430: 1428: 1425: 1423: 1420: 1418: 1415: 1413: 1410: 1408: 1405: 1403: 1400: 1398: 1395: 1393: 1390: 1388: 1385: 1383: 1380: 1378: 1375: 1373: 1370: 1368: 1365: 1363: 1360: 1358: 1355: 1354: 1352: 1350: 1346: 1340: 1337: 1335: 1332: 1330: 1327: 1325: 1322: 1320: 1317: 1315: 1312: 1310: 1307: 1305: 1302: 1300: 1299:Planum Boreum 1297: 1295: 1292: 1290: 1289:Olympia Undae 1287: 1285: 1282: 1280: 1277: 1275: 1274:Eridania Lake 1272: 1270: 1267: 1265: 1262: 1260: 1257: 1255: 1252: 1250: 1247: 1246: 1244: 1240: 1236: 1229: 1225: 1221: 1217: 1213: 1206: 1201: 1199: 1194: 1192: 1187: 1186: 1183: 1172: 1158:on 2016-11-30 1157: 1153: 1147: 1138: 1131: 1125: 1109: 1103: 1087: 1083: 1077: 1062: 1061: 1056: 1049: 1034: 1028: 1020: 1016: 1012: 1008: 1004: 1000: 993: 984: 974: 965: 960: 956: 952: 948: 944: 940: 933: 924: 919: 915: 911: 907: 903: 899: 892: 883: 878: 874: 870: 866: 862: 858: 851: 843: 839: 835: 831: 827: 823: 819: 815: 811: 807: 796: 788: 784: 780: 776: 772: 768: 764: 757: 755: 739: 733: 725: 719: 712: 706: 698: 694: 690: 686: 682: 678: 671: 661: 652: 647: 643: 639: 635: 631: 627: 620: 618: 616: 611: 604: 595: 591: 587: 586: 581: 580: 572: 571:Polar regions 568: 564: 560: 549:); yellow is 540: 539: 534: 530: 522: 518: 428: 421: 416: 409: 404: 397: 392: 385: 380: 379: 371: 366: 359: 354: 350: 346: 339: 334: 327: 322: 318: 311: 306: 298: 293: 286: 281: 277: 270: 265: 258: 253: 249: 245: 242:, as seen by 241: 235: 230: 226: 222: 215: 210: 206: 202: 195: 190: 189: 183: 180: 175: 171: 162: 158: 156: 152: 138: 126: 116: 109: 107: 106:Lake Superior 103: 93: 90: 86: 77: 74: 71: 68: 65: 64: 63: 60: 58: 54: 50: 44: 42: 38: 33: 29: 25: 24:mid-latitudes 21: 4777:Solar System 4428:Schiaparelli 4373:Robert Sharp 4213:Orson Welles 3510:Du Martheray 3400:Chryse Alien 3395:Chincoteague 3235:Arkhangelsky 3147:Rupes Tenuis 3112:Ganges Mensa 3067:Tempe Fossae 2997:Cyane Fossae 2992:Coloe Fossae 2670:Green Valley 2593:Ophir Chasma 2588:Melas Chasma 2553:Hebes Chasma 2523:Echus Chasma 2503:Aureum Chaos 2460:Siloe Patera 2445:Orcus Patera 2425:Syria 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Index

mid-latitudes
Utopia Planitia
Peneus
insolation
sublimation
Phoenix mission
SHARAD
Mars Reconnaissance Orbiter
patterned ground
periglacial
underground ice
Lake Superior
Mars


Mars Reconnaissance Orbiter
SHARAD

dielectric permittivity
MOLA
Basalt
Scalloped terrain at Peneus Patera, as seen by HiRISE. Scalloped terrain is quite common in some areas of Mars. Image is from the Noachis quadrangle.
HiRISE
Noachis quadrangle
Periglacial forms in Utopia, as seen by HiRISE, showing patterned ground and scalloped topography. Image in Casius quadrangle.
HiRISE
Casius quadrangle
Mad Vallis, as seen by HiRISE, exhibiting scalloped terrain. Picture on right is an enlargement of part of the other picture. Image in Hellas quadrangle.
Mad Vallis
HiRISE

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