Kona Dolomite (Paleoproterozoic, 2.2 to 2.3 Ga; County Road 553 roadcut, south of Marquette, Upper Peninsula of Michigan, USA) : 無料・フリー素材/写真
Kona Dolomite (Paleoproterozoic, 2.2 to 2.3 Ga; County Road 553 roadcut, south of Marquette, Upper Peninsula of Michigan, USA) / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Metadolostone in the Precambrian of Michigan, USA.These rocks are part of the Kona Dolomite, a well-known stratigraphic unit that outcrops in the vicinity of Marquette, Michigan. The unit was named after the Kona Hills to the southwest of Marquette. Color variation and susceptibility to polishing make Kona rocks popular with rockhounds and lapidarists. Common lithologies in the Kona include metadolostone, silicified metadolostone, stromatolitic metadolostone, quartzite, argillite, and slaty metadolostone. Kona beds are structurally tilted and have been multiply metamorphosed during Precambrian orogenic events. Stratigraphy: Kona Dolostone, Chocolay Group, lower Marquette Range Supergroup, Paleoproterozoic, ~2.20-2.29 GaLocality: hilltop roadcut along County Road 553, just northeast of Pelissier Lake, south of the town of Marquette, Upper Peninsula of Michigan, USA |
| 撮影日 | 2012-12-17 14:55:44 |
| 撮影者 | James St. John |
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