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| vredefort-dome.jpg[180×120] Vredefort Dome : Believed to be the oldest and largest clearly-visible impact structure. 掲載元ホームページ | |
| heritage_vredefort.jpg[565×166] 掲載元ホームページ | |
| Enjoying+Vredefort+Dome.JP[120×90] 掲載元ホームページ | |
| vredefort_dome_001.jpg[670×428] 掲載元ホームページ | |
| vredefort_dome_004.jpg[670×403] 掲載元ホームページ | |
| vredefortdomeimagesmall.jp[140×124] later. The Vredefort Dome Impact Crater itself is no longer visible having eroded away over the last 2 billion years. The diameter of the crater has been estimated at between 250 and 300 kms. If you look at the satellite mage here you will see quite clearly the Dome shaped structure around the town of Vredefort. You will notice the arc of hills to the north west (left) which are 掲載元ホームページ | |
| vredefort_dome_003.jpg[670×428] 掲載元ホームページ | |
| vredefort_dome_002.jpg[670×428] 掲載元ホームページ | |
| vredefort-20dome-20-20good[312×256] once considered that type of structure until shatter cones revealed its extraterrestrial origin as a depression) in South Africa southeast of Johannesburg. Here it is as seen from space: 掲載元ホームページ | |
| VREDEFORT_EXAG20_64_OUTRO [1280×956] would the rim of the crater form a truncated circle. An electric arc causes a subsurface blast (as demonstrated by tachylites found in the rim of South Africa's Vredefort Dome , for example) and in the case of the Iapetus crater, the arc tried to cut into the tall pre-existing wall and undercut the cliff, causing it to collapse 掲載元ホームページ |