| 21. | Basement rock was formed during the Hercynian orogeny when a strong regional metamorphism affected the area.
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| 22. | This isotope signature may be the effect of assimilation of deeper basement rocks during magma formation.
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| 23. | The islands are of volcanic origin with basement rocks forming between the late Cretaceous and early Eocene.
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| 24. | As such, the basement rock can become younger going closer to the edge of the continent.
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| 25. | Working on local Precambrian basement rocks, Sederholm instigated a igneous magma into metamorphic rocks at depth.
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| 26. | These basement rocks were created during the late Mesozoic era, long before the Itcha Range formed.
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| 27. | Lava from the western flank flowed over basement rocks and trachytes of the pre-explosive phase.
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| 28. | The Ravensthorpe region is underlain by basement rocks of the Albany-Fraser Orogen and Yilgarn Craton.
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| 29. | The area is composed of a well defined ridge of silicified brown sandstone overlaying the basement rock.
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| 30. | Typically, the temperature in those vast regions of the accessible crystalline basement rock increases with depth.
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