Mill Creek Canyon
Mill Creek Canyon is a part of many different formations. Because of the way Mill Creek was formed, it spanned many different times, ranging from Mississippian to Jurassic to Triassic.
The oldest rocks in Mill Creek Canyon are part of the Pennsylvanian and Mississippian age. The part of Mill Creek Canyon that has these old rocks are parts of Deseret and Round Valley Limestones, and Humbug and Doughnut Formations that cross into the canyon. At the western and mouth of Mill Creek, the Pennslyvanian Weber Quartzite is common. During the Sevier Orogeny, 85 million years ago, the quartzite was folded and crushed by thrust faulting, but was originally a sandy marine beach.
The Permian Park City Formation is a gray limestone that has Brachiopods in Rattlesnake Gulch, part of Mill Creek Canyon.
Triassic Woodside Shale is a red siltstone and fine- grained sandstone.
The Triassic Thaynes Formation contains a lot of marine fossils, like corals, shells and other marine animal parts.The most recognized feature of this is a huge limestone ridge that stands out noticeably above the vegetation on the north end of the canyon.
The triassic Ankareh Formation and jurassic Nugget Sandstone ate the youngest rocks in Mill Creek Canyon. They are the northernmost rocks in the canyon, by the red Nugget Sandstone boulders.Mill Creek Canyon has many different parts, as mentioned above. This makes it a diverse canyon with a lot of geologic facts.
The oldest rocks in Mill Creek Canyon are part of the Pennsylvanian and Mississippian age. The part of Mill Creek Canyon that has these old rocks are parts of Deseret and Round Valley Limestones, and Humbug and Doughnut Formations that cross into the canyon. At the western and mouth of Mill Creek, the Pennslyvanian Weber Quartzite is common. During the Sevier Orogeny, 85 million years ago, the quartzite was folded and crushed by thrust faulting, but was originally a sandy marine beach.
The Permian Park City Formation is a gray limestone that has Brachiopods in Rattlesnake Gulch, part of Mill Creek Canyon.
Triassic Woodside Shale is a red siltstone and fine- grained sandstone.
The Triassic Thaynes Formation contains a lot of marine fossils, like corals, shells and other marine animal parts.The most recognized feature of this is a huge limestone ridge that stands out noticeably above the vegetation on the north end of the canyon.
The triassic Ankareh Formation and jurassic Nugget Sandstone ate the youngest rocks in Mill Creek Canyon. They are the northernmost rocks in the canyon, by the red Nugget Sandstone boulders.Mill Creek Canyon has many different parts, as mentioned above. This makes it a diverse canyon with a lot of geologic facts.
