Difference between revisions of "September 15, 2010"

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=Bridge Near Bullialdus=
 
=Bridge Near Bullialdus=
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<em>image by [mailto:philip.morgan32@yahoo.co.uk" rel="nofollow Philip Morgan]</em><br />
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<em>image by [mailto:philip.morgan32@yahoo.co.uk Philip Morgan]</em><br />
 
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<td>Running in a northwesterly direction from the outer flank of the crater Bullialdus is a wide flat graben/valley some 20 km in width and about 90 km long. Midway along the valley floor is a peculiar flat topped 10 km wide wall that effectively dams the floor of the valley, which under some lighting conditions can be mistaken for a bridge. Finding a convincing explanation for this little feature is difficult, but presumably when the valley floor of Bullialdus W subsided, the crustal material of the bridge was more resistant to the downward movement of material, possibly because it is the surface expression of a magmatic intrusion, i.e. a dyke or horst. Interestingly, and as my recent observation shows, the bridge is actually slightly thicker at its upside or (southwestern) end rather than at its base. Could this be due to a downward (northerleasterly) flow of material in the valley floor? Situated just a little way to the east of the bridge a curving mountain arm also spans the valley floor, though whether or not this is just the remnant of a once perfect crater rampart is difficult to say.<br />
 
<td>Running in a northwesterly direction from the outer flank of the crater Bullialdus is a wide flat graben/valley some 20 km in width and about 90 km long. Midway along the valley floor is a peculiar flat topped 10 km wide wall that effectively dams the floor of the valley, which under some lighting conditions can be mistaken for a bridge. Finding a convincing explanation for this little feature is difficult, but presumably when the valley floor of Bullialdus W subsided, the crustal material of the bridge was more resistant to the downward movement of material, possibly because it is the surface expression of a magmatic intrusion, i.e. a dyke or horst. Interestingly, and as my recent observation shows, the bridge is actually slightly thicker at its upside or (southwestern) end rather than at its base. Could this be due to a downward (northerleasterly) flow of material in the valley floor? Situated just a little way to the east of the bridge a curving mountain arm also spans the valley floor, though whether or not this is just the remnant of a once perfect crater rampart is difficult to say.<br />
 
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<em> [mailto:philip.morgan32@yahoo.co.uk" rel="nofollow Philip Morgan]</em><br />
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<em> [mailto:philip.morgan32@yahoo.co.uk Philip Morgan]</em><br />
 
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<strong>Technical Details</strong><br />
 
<strong>Technical Details</strong><br />
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<strong>Related Links</strong><br />
 
<strong>Related Links</strong><br />
Rükl plate [http://the-moon.wikispaces.com/R%C3%BCkl+53 53]<br />
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Rükl plate [https://the-moon.us/wiki/R%C3%BCkl_53 53]<br />
 
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<p><b>Yesterday's LPOD:</b> [[September 14, 2010|Seeing More At Wargentin]] </p>
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<p><b>Tomorrow's LPOD:</b> [[September 16, 2010|Saturday's Moon Maddness]] </p>
 
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<div>You can support LPOD when you buy any book from Amazon thru [http://www.lpod.org/?page_id=591" rel="nofollow LPOD!]<br />
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Latest revision as of 18:56, 13 October 2018

Bridge Near Bullialdus

LPOD-Sept15-10.jpg

image by Philip Morgan

Running in a northwesterly direction from the outer flank of the crater Bullialdus is a wide flat graben/valley some 20 km in width and about 90 km long. Midway along the valley floor is a peculiar flat topped 10 km wide wall that effectively dams the floor of the valley, which under some lighting conditions can be mistaken for a bridge. Finding a convincing explanation for this little feature is difficult, but presumably when the valley floor of Bullialdus W subsided, the crustal material of the bridge was more resistant to the downward movement of material, possibly because it is the surface expression of a magmatic intrusion, i.e. a dyke or horst. Interestingly, and as my recent observation shows, the bridge is actually slightly thicker at its upside or (southwestern) end rather than at its base. Could this be due to a downward (northerleasterly) flow of material in the valley floor? Situated just a little way to the east of the bridge a curving mountain arm also spans the valley floor, though whether or not this is just the remnant of a once perfect crater rampart is difficult to say.


Philip Morgan

Technical Details
Date correction: 3rd of Sept. and the relative col.is 204.9 to 205.2 degrees

Related Links
Rükl plate 53


Yesterday's LPOD: Seeing More At Wargentin

Tomorrow's LPOD: Saturday's Moon Maddness



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