| 21. | I think that we need data from the ground to confirm that these are impact structures,
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| 22. | The vitrophyres are dominantly glassy rocks that represent impact melt sheets that fill large impact structures.
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| 23. | "' Saarij�rvi "'is an impact structure mostly covered by a small lake by the same name.
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| 24. | This lake, which lies in a basalt impact structure, is both saline and alkaline in nature.
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| 25. | Stishovite, however, is only known from impact structures.
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| 26. | To the southwest of Schiller is the Schiller-Zucchius Basin, a Pre-Nectarian basin ( multi-ringed impact structure ).
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| 27. | To the northeast of Zucchius is the Schiller-Zucchius Basin, a Pre-Nectarian basin ( multi-ringed impact structure ).
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| 28. | The discovery was made in 1989 and therefore Iso-Naakkima is the fourth known impact structure in Finland.
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| 29. | They also noted that evidence for the Kebira Crater being an impact structure lacked direct field observations.
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| 30. | The current publications do not list a more precise location for the impact structure than the island.
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