| 31. | This impact structure was studied in 1978.
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| 32. | After further study, it was found the project would impact structures downstream all the way to Canada.
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| 33. | The first suggestion that the ring-like topographic feature may be an impact structure was published in 1974.
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| 34. | Saarij�rvi is the only currently accepted impact structure in Fennoscandian Shield formed in Archean granitoid basement complex.
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| 35. | Possible impact structures may be initially recognized by their anomalous geological character or extraterrestrial material or other methods.
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| 36. | However, the discovery of the Middlesboro impact structure has proposed new details in the formation of Cumberland Gap.
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| 37. | "' Goyder "'is an impact structure ( or astrobleme ), the eroded remnant of a former impact crater.
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| 38. | In an impact structure, the typical visible and topographic expressions of an impact crater are no longer obvious.
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| 39. | At the very beginning of the period, 2023 Mya, a large asteroid collision created the Vredefort impact structure.
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| 40. | That fiery impact melted the earth's crust along a 36-mile gash now known as the Sudbury Impact Structure.
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