Gullies on Mars
Martian gullies are small, incised networks of narrow channels and their associated downslope sediment deposits, found on the planet of Mars . They are named for their resemblance to terrestrial gullies . First discovered on images from Mars Global Surveyor , they occur on steep slopes, especially on the walls of craters. Usually, each gully has a dendritic alcove at its head, a fan-shaped apron at its base, and a single thread of incised channel linking the two, giving the whole gully an hourglass shape. [1] They are estimated to be relatively young because they have few, if any craters. A subclass of gullies is also found cut into the faces of sand dunes, [2] that are themselves considered to be quite young. Linear dune gullies are now considered recurrent seasonnal afeatures. [3]
Page Revisions
| Year | Metadata | Sections | Top Words | First Paragraph |
| 2018 |
283446 characters 12 sections 122 paragraphs 98 images 752 internal links 97 external links |
gullies 0.731 hiwish 0.314 hirise 0.263 gully 0.176 program 0.173 ice 0.114 image 0.102 channels 0.095 crater 0.089 water 0.088 slopes 0.087 view 0.081 snow 0.077 dry 0.075 close 0.071 |
Martian gullies are small, incised networks of narrow channels and their associated downslope sediment deposits, found on the planet of Mars . They are named for their resemblance to terrestrial gullies . First discovered on images from Mars Global Surveyor , they occur on steep slopes, especially on the walls of craters. Usually, each gully has a dendritic alcove at its head, a fan-shaped apron at its base, and a single thread of incised channel linking the two, giving the whole gully an hourglass shape. [1] They are estimated to be relatively young because they have few, if any craters. A subclass of gullies is also found cut into the faces of sand dunes, [2] that are themselves considered to be quite young. Linear dune gullies are now considered recurrent seasonnal afeatures. [3] |
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| 2017 |
272257 characters 11 sections 118 paragraphs 94 images 752 internal links 84 external links |
gullies 0.735 hiwish 0.324 hirise 0.260 program 0.178 gully 0.165 ice 0.104 image 0.101 channels 0.100 water 0.090 crater 0.087 slopes 0.086 snow 0.080 view 0.075 dry 0.075 close 0.070 |
Martian gullies are small, incised networks of narrow channels and their associated downslope sediment deposits, found on the planet of Mars . They are named for their resemblance to terrestrial gullies . First discovered on images from Mars Global Surveyor , they occur on steep slopes, especially on the walls of craters. Usually, each gully has a dendritic alcove at its head, a fan-shaped apron at its base, and a single thread of incised channel linking the two, giving the whole gully an hourglass shape. [1] They are estimated to be relatively young because they have few, if any craters. A subclass of gullies is also found cut into the faces of sand dunes, [2] that are themselves considered to be quite young. Linear dune gullies are now considered recurrent seasonnal afeatures. [3] |
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| 2016 |
189940 characters 10 sections 104 paragraphs 80 images 199 internal links 75 external links |
gullies 0.722 hiwish 0.320 hirise 0.246 program 0.177 gully 0.171 image 0.115 ice 0.103 water 0.102 slopes 0.097 channels 0.092 snow 0.091 crater 0.080 liquid 0.078 aquifers 0.076 aquifer 0.068 |
Martian gullies are small, incised networks of narrow channels and their associated downslope sediment deposits, found on the planet of Mars . They are named for their resemblance to terrestrial gullies . First discovered on images from Mars Global Surveyor , they occur on steep slopes, especially on the walls of craters. Usually, each gully has a dendritic alcove at its head, a fan-shaped apron at its base, and a single thread of incised channel linking the two, giving the whole gully an hourglass shape. [1] They are estimated to be relatively young because they have few, if any craters. A subclass of gullies is also found cut into the faces of sand dunes, [2] that are themselves considered to be quite young. |
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| 2015 |
168344 characters 12 sections 87 paragraphs 66 images 198 internal links 62 external links |
gullies 0.730 hiwish 0.287 hirise 0.222 program 0.161 gully 0.135 image 0.115 ice 0.108 slopes 0.104 snow 0.103 water 0.100 channels 0.095 crater 0.087 aquifers 0.087 aquifer 0.078 changes 0.077 |
Martian gullies are small, incised networks of narrow channels and their associated downslope sediment deposits, found on the planet of Mars . They are named for their resemblance to terrestrial gullies . First discovered on images from Mars Global Surveyor , they occur on steep slopes, especially on the walls of craters. Usually, each gully has a dendritic alcove at its head, a fan-shaped apron at its base, and a single thread of incised channel linking the two, giving the whole gully an hourglass shape. [1] They are estimated to be relatively young because they have few, if any craters. A subclass of gullies is also found cut into the faces of sand dunes, [2] that are themselves considered to be quite young. |
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| 2014 |
139639 characters 11 sections 70 paragraphs 57 images 195 internal links 55 external links |
gullies 0.773 hiwish 0.218 hirise 0.205 slopes 0.130 snow 0.128 program 0.127 aquifers 0.108 gully 0.105 image 0.104 water 0.103 ice 0.099 changes 0.084 crater 0.082 liquid 0.079 shade 0.076 |
Martian gullies are small, incised networks of narrow channels and their associated downslope sediment deposits, found on the planet of Mars . They are named for their resemblance to terrestrial gullies . First discovered on images from Mars Global Surveyor , they occur on steep slopes, especially on the walls of craters. Usually, each gully has a dendritic alcove at its head, a fan-shaped apron at its base, and a single thread of incised channel linking the two, giving the whole gully an hourglass shape. [1] They are believed to be relatively young because they have few, if any craters. A subclass of gullies is also found cut into the faces of sand dunes, that are themselves considered to be quite young. |
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| 2013 |
129410 characters 9 sections 66 paragraphs 54 images 190 internal links 50 external links |
gullies 0.768 hiwish 0.229 hirise 0.212 program 0.133 slopes 0.132 aquifers 0.130 snow 0.129 image 0.113 gully 0.102 water 0.093 crater 0.087 shade 0.082 mantle 0.082 ice 0.081 aquifer 0.078 |
Martian gullies are small, incised networks of narrow channels and their associated downslope sediment deposits, found on the planet of Mars . They are named for their resemblance to terrestrial gullies . First discovered on images from Mars Global Surveyor , they occur on steep slopes, especially on the walls of craters. Usually, each gully has a dendritic alcove at its head, a fan-shaped apron at its base, and a single thread of incised channel linking the two, giving the whole gully an hourglass shape. They are believed to be relatively young because they have few, if any craters. A subclass of gullies is also found cut into the faces of sand dunes, that are themselves considered to be quite young. |
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| 2012 |
113755 characters 16 sections 68 paragraphs 55 images 48 internal links 49 external links |
2. Mare Acidalium quadrangle Gullies |
gullies 0.745 hiwish 0.248 hirise 0.236 program 0.144 slopes 0.134 aquifers 0.132 snow 0.131 image 0.127 crater 0.096 gully 0.093 mantle 0.092 water 0.088 shade 0.084 aquifer 0.080 ice 0.078 |
Martian Gullies are gullies found on the planet of Mars . First discovered on images from Mars Global Surveyor , they may be the site of recent liquid water. Gullies occur on steep slopes, especially on the walls of craters. These are believed to be relatively young because they have few, if any craters. Moreover, they lie on top of sand dunes which themselves are considered to be quite young. Usually, each gully has an alcove, channel, and apron. Some studies have found that gullies occur on slopes that face all directions, [1] others have found that the greater number of gullies are found on poleward facing slopes, especially from 30-44 S. [2] Although thousands have been found, they appear to be restricted to only certain areas of the planet. Most occur 30 degrees poleward in each hemisphere with greater numbers in the southern hemisphere. In the northern hemisphere, they have been found in Arcadia Planitia , Tempe Terra , Acidalia Planitia , and Utopia Planitia . [3] In the south, high concentrations are found on the northern edge of Argyre basin, in northern Noachis Terra , and along the walls of the Hellas outflow channels. [3] |
| 2011 |
94993 characters 12 sections 50 paragraphs 36 images 41 internal links 49 external links |
gullies 0.745 hirise 0.172 slopes 0.163 aquifers 0.160 snow 0.160 hiwish 0.126 mantle 0.111 water 0.104 shade 0.102 crater 0.098 aquifer 0.097 ice 0.095 facing 0.093 image 0.093 tilt 0.087 |
First discovered on images from Mars Global Surveyor, Martian gullies may be the site of recent liquid water. Gullies occur on steep slopes, especially on the walls of craters. Gullies are believed to be relatively young because they have few, if any craters. Moreover, they lie on top of sand dunes which themselves are considered to be quite young. Usually, each gully has an alcove, channel, and apron. Some studies have found that gullies occur on slopes that face all directions, [1] others have found that the greater number of gullies are found on poleward facing slopes, especially from 30-44 S. [2] Although thousands have been found, they appear to be restricted to only certain areas of the planet. Most occur 30 degrees poleward in each hemisphere with greater numbers in the southern hemisphere. In the northern hemisphere, they have been found in Arcadia Planitia , Tempe Terra , Acidalia Planitia , and Utopia Planitia . [3] In the south, high concentrations are found on the northern edge of Argyre basin, in northern Noachis Terra , and along the walls of the Hellas outflow channels. [3] |
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| 2010 |
51535 characters 10 sections 31 paragraphs 23 images 31 internal links 12 external links |
gullies 0.734 aquifers 0.212 slopes 0.176 hirise 0.152 mantle 0.134 aquifer 0.128 ice 0.112 water 0.108 image 0.102 crater 0.096 isolated 0.091 flow 0.084 liquid 0.084 snowpacks 0.082 ross 0.081 |
First discovered on images from Mars Global Surveyor, Martian gullies may be the site of recent liquid water. Gullies occur on steep slopes, especially on the walls of craters. Gullies are believed to be relatively young because they have few, if any craters. Moreover, they lie on top of sand dunes which themselves are considered to be quite young. Usually, each gully has an alcove, channel, and apron. Some studies have found that gullies occur on slopes that face all directions, [1] others have found that the greater number of gullies are found on poleward facing slopes, especially from 30-44 S. [2] [3] Although thousands have been found, they appear to be restricted to only certain areas of the planet. Most occur 30 degrees poleward in each hemisphere with greater numbers in the southern hemisphere. In the northern hemisphere, they have been found in Arcadia Planitia , Tempe Terra , Acidalia Planitia , and Utopia Planitia . [4] In the south, high concentrations are found on the northern edge of Argyre basin, in northern Noachis Terra , and along the walls of the Hellas outflow channels. [5] |