Ajibik Quartzite (Paleoproterozoic, 2.1-2.2 Ga; roadcut in the Ragged Hills, Upper Peninsula of Michigan, USA) 1 : 無料・フリー素材/写真
Ajibik Quartzite (Paleoproterozoic, 2.1-2.2 Ga; roadcut in the Ragged Hills, Upper Peninsula of Michigan, USA) 1 / 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 | Quartzite in the Precambrian of Michigan, USA.The Ajibik Quartzite is the lower unit of the Precambrian-aged Menominee Group in northern Michigan. Its lower contact is an unconformity. The dominant Ajibik lithologies include quartzite (metaquartzite), some arkosic quartzite, and some metagraywackes. The basal portions of the Ajibik are conglomeratic (with clasts of slate, quartzite, chert, & vein quartz), and have been referred to as the Seaman Conglomerate. The original sandstones of the Ajibik were very likely shallow-water marine.Stratigraphy: Ajibik Quartzite, lower Menominee Group, mid-Marquette Range Supergroup, Mid-Paleoproterozoic, 2.1-2.2 Ga (or 1.8-1.9 Ga)Locality: roadcut along the southern side of County Road 480, just east of Mud Lake, western side of the Ragged Hills, southwest of the town of Marquette, Upper Peninsula of Michigan, USA |
| 撮影日 | 2012-12-17 14:42:28 |
| 撮影者 | James St. John |
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