Park City Formation | |
---|---|
Stratigraphic range: Kungurian-Guadalupian, ~ | |
Type | Formation |
Underlies | Dinwoody Formation |
Overlies | Weber Formation, Tensleep Formation |
Area | 60,000 square kilometers |
Thickness | 300-30 meters |
Location | |
Region | Montana, Utah, Idaho, Wyoming |
Country | United States |
Type section | |
Named by | Boutwell, 1906 |
This article includes a list of general references, but it lacks sufficient corresponding inline citations .(March 2024) |
The Park City Formation is a fossiliferous sedimentary formation from the late Permian of Utah, Idaho, Wyoming, and Montana. It is defined by its cherty, gray to pinkish limestone, calcareous siltstone, and cherty sandstone. The rocks in this formation formed along a shallow marine continental shelf and were regularly interrupted by the Phosphoria Formation due to tectonic forces and sea level change.
The Park City Formation was deposited across approximately 60,000 square kilometers of northern Utah, western Wyoming, and a small sliver of southwestern Montana. This deposition probably occurred across three distinct sea level fluctuations throughout the mid-late Permian. It sits squarely between the Phosphoria Formation (which is actually intercalated throughout several layers of the Park City Formation) to the North and West, and the Goose Egg Formation to the south and east. Exposed Park City Formation facies make a “J” shape through these three states. Dates of this formation span from the late Leonardian to the early Guadalupian epochs of the mid-late Permian (about 280-260 million years ago). This formation was deposited due to the subsidence of underlying Oquirrh and Sublett basins during the early and middle Paleozoic. This subsidence resulted in a relatively deep 'sink' where tidal sediments could then accumulate. At the time of its deposition, the Park City Formation ran along the western coast of Pangaea, at middle-Northern latitudes. It was thickest along its western side at about 300 meters, and slowly started to thin as it moved east to about 30 meters. Along its south end, the Park City Formation is divided into two members: the Grandeur and Franson. These two members are separated from each other by interwoven Phosphoria Formation deposits and an unconformity. Another unconformity further separates the upper and lower Franson members. This unconformity is a sequence of red shale from the Woodside Formation, and is labeled as the 'Mackentire Tongue'. However, as pointed out by Geldon (2002), the Woodside Formation is dated to be Early-Mid Triassic. This means that the red shale either isn't Woodside, or the Woodside Formation extends to the Permian. To the North, the Park City Formation is divided into three members: Grandeur, Franson, and Ervay. Franson and Ervay are again separated by an unconformity.
There are six distinct rock types with 15 facies of the Park City Formation, as detailed in Whalen, (1996). From oldest to youngest, the Park City Formation is composed of fine non-carbonates (chert and dolo-shale), sand/siltstones, conglomerates, coarse carbonates (rudstone, packstone, and grainstone), wackestones, and carbonate mudstones. The depths at which these rocks were formed range from deep subtidal to shallow peritidal. Underlying the Park City Formation are the Pennsylvanian and Early Permian sandstones of the Weber and Tensleep formations, and overlying is the Dinwoody Formation. The last epoch of the Permian is missing from the geologic record in this area, meaning there is a time gap of around 8 million years.
These rock types, as well as the geological composition of surrounding formations, indicate that the Park City Formation's depositional environment was a series of shallow tidal flats and sabkha deposits in the east to continental shelf and deep water deposition in the west. Whalen (1996) posits that due to the water depth gradient, the Park City Formation (as well as surrounding formations) represents a carbonate ramp.
The Park City Formation was first described by Boutwell (1906, pages 443-446), who illustrated the formation simply as the rock beds underlying the red shales of the Woodside Formation, and Overlying the Pennsylvanian Weber quartzite. It was further surveyed by McKelvey and others in 1959, who detailed its economic significance. McKelvey and others labeled the Park City and Phosphoria formations as "the most extensive phosphorite beds in the United States." Phosphorite beds are the primary method of retrieving phosphorus and phosphates, which are used as fertilizer in arid soil. Weathering and heat reduce phosphorus levels in soil, which native plants are acclimated to. However, imported crops need phosphorus/phosphate supplements to properly grow in dry climates. Additionally, phosphorus is used in manufacturing detergents.
The Park City Formation also has a plentiful conodont and cephalopod record. The latest Permian beds of the Park City Formation and the earliest Triassic beds of the Dinwoody represent a mostly continuous sequence, which is extremely rare around this time. This sequence is significant because the largest mass extinction in Earth's history occurred right at the boundary of these two time periods. Using conodonts, researchers have defined the Permian-Triassic boundary at the base of the Dinwoody Formation, and just after the Park City Formation. This is supported by the Park City Formation's presence of Merrillina divergens , a conodont that only occurs at the latest stages of the Permian. Cephalopod occurrence in the Park City Formation, namely Stacheoceras , Gastrioceras , Goniatites , and Waagenoceras , further supports its age being the latest Permian.
The geology of the Grand Teton area consists of some of the oldest rocks and one of the youngest mountain ranges in North America. The Teton Range, partly located in Grand Teton National Park, started to grow some 9 million years ago. An older feature, Jackson Hole, is a basin that sits aside the range.
The Moenkopi Formation is a geological formation that is spread across the U.S. states of New Mexico, northern Arizona, Nevada, southeastern California, eastern Utah and western Colorado. This unit is considered to be a group in Arizona. Part of the Colorado Plateau and Basin and Range, this red sandstone was laid down in the Lower Triassic and possibly part of the Middle Triassic, around 240 million years ago.
The Kaibab Limestone is a resistant cliff-forming, Permian geologic formation that crops out across the U.S. states of northern Arizona, southern Utah, east central Nevada and southeast California. It is also known as the Kaibab Formation in Arizona, Nevada, and Utah. The Kaibab Limestone forms the rim of the Grand Canyon. In the Big Maria Mountains, California, the Kaibab Limestone is highly metamorphosed and known as the Kaibab Marble.
The Chugwater Formation is a mapped bedrock unit consisting primarily of red sandstone, in the states of Wyoming, Montana, and Colorado in the United States. It is recognized as a geologic formation in Colorado and Montana, but as a Group, the Chugwater Group, in Wyoming. Despite its presence below the highly studied Morrison Formation, the Chugwater receives little attention.
Hindeodus is an extinct genus of conodonts in the family Anchignathodontidae. The generic name Hindeodus is a tribute to George Jennings Hinde, a British geologist and paleontologist from the 1800s and early 1900s. The suffix -odus typically describes the animal's teeth, essentially making Hindeodus mean Hinde-teeth.
The Ecca Group is the second of the main subdivisions of the Karoo Supergroup of geological strata in southern Africa. It mainly follows conformably after the Dwyka Group in some sections, but in some localities overlying unconformably over much older basement rocks. It underlies the Beaufort Group in all known outcrops and exposures. Based on stratigraphic position, lithostratigraphic correlation, palynological analyses, and other means of geological dating, the Ecca Group ranges between Early to earliest Middle Permian in age.
The San Juan Basin is a geologic structural basin located near the Four Corners region of the Southwestern United States. The basin covers 7,500 square miles and resides in northwestern New Mexico, southwestern Colorado, and parts of Utah and Arizona. Specifically, the basin occupies space in the San Juan, Rio Arriba, Sandoval, and McKinley counties in New Mexico, and La Plata and Archuleta counties in Colorado. The basin extends roughly 100 miles (160 km) N-S and 90 miles (140 km) E-W.
The Ishbel Group is a stratigraphic unit of Permian age in the Western Canadian Sedimentary Basin. It is present in the Canadian Rockies of Alberta and British Columbia. First defined by A. McGugan in 1963, it is named for Mount Ishbel of the Sawback Range in Banff National Park, and parts of the group were first described in the vicinity of the mountain at Ranger Canyon and Johnston Canyon.
The Phosphoria Formation of the western United States is a geological formation of Early Permian age. It represents some 15 million years of sedimentation, reaches a thickness of 420 metres (1,380 ft) and covers an area of 350,000 square kilometres (140,000 sq mi).
The Pyrenees are a 430-kilometre-long, roughly east–west striking, intracontinental mountain chain that divide France, Spain, and Andorra. The belt has an extended, polycyclic geological evolution dating back to the Precambrian. The chain's present configuration is due to the collision between the microcontinent Iberia and the southwestern promontory of the European Plate. The two continents were approaching each other since the onset of the Upper Cretaceous (Albian/Cenomanian) about 100 million years ago and were consequently colliding during the Paleogene (Eocene/Oligocene) 55 to 25 million years ago. After its uplift, the chain experienced intense erosion and isostatic readjustments. A cross-section through the chain shows an asymmetric flower-like structure with steeper dips on the French side. The Pyrenees are not solely the result of compressional forces, but also show an important sinistral shearing.
The Zonguldak basin of northwestern Turkey is the only basin in Turkey with mineable coal deposits. It has been mined for coal since the late 1800s. The basin takes its name after Zonguldak, Turkey, and lies at approximately 41° N. It is roughly elliptical in shape with its long axis oriented roughly southwest to northeast, and is adjacent to the Black Sea. Three main regions have been recognized in the Zonguldak basin: from west to east, Armutcuk, Zonguldak, and Amasra.
The Dinwoody Formation is a geologic formation in the western United States. It preserves fossils dating back to the Triassic period.
The Coyote Butte Limestone (OR085) is a geologic formation in Oregon. It preserves fossils dating back to the Sakmarian to Kungurian stages of the Permian period, spanning an estimated 23 million years. The formation occurs in isolated buttes to the north; Triangulation Hill, and south; type locality and name giver Coyote Butte and Tuckers Butte, on either side of the Grindstone and Twelvemile Creeks in Crook County, Oregon.
In 2015, 27.6 million metric tons of marketable phosphate rock, or phosphorite, was mined in the United States, making the US the world's third-largest producer, after China and Morocco. The phosphate mining industry employed 2,200 people. The value of phosphate rock mined was US$2.2 billion.
One of the major depositional strata in the Himalaya is the Lesser Himalayan Strata from the Paleozoic to Mesozoic eras. It had a quite different marine succession during the Paleozoic, as most parts of it are sparsely fossiliferous or even devoid of any well-defined fossils. Moreover, it consists of many varied lithofacies, making correlation work more difficult. This article describes the major formations of the Paleozoic – Mesozoic Lesser Himalayan Strata, including the Tal Formation, Gondwana Strata, Singtali Formation and Subathu Formation.
The Organ Rock Formation or Organ Rock Shale is a formation within the late Pennsylvanian to early Permian Cutler Group and is deposited across southeastern Utah, northwestern New Mexico, and northeastern Arizona. This formation notably outcrops around Canyonlands National Park, Natural Bridges National Monument, and Monument Valley of northeast Arizona, southern Utah. The age of the Organ Rock is constrained to the latter half of the Cisuralian epoch by age dates from overlying and underlying formations. Important early terrestrial vertebrate fossils have been recovered from this formation in northern Arizona, southern Utah, and northern New Mexico. These include the iconic Permian terrestrial fauna: Seymouria, Diadectes, Ophiacodon, and Dimetrodon. The fossil assemblage present suggests arid environmental conditions. This is corroborated with paleoclimate data indicative of global drying throughout the early Permian.
The geology of Utah, in the western United States, includes rocks formed at the edge of the proto-North American continent during the Precambrian. A shallow marine sedimentary environment covered the region for much of the Paleozoic and Mesozoic, followed by dryland conditions, volcanism, and the formation of the basin and range terrain in the Cenozoic.
The geology of Uzbekistan consists of two microcontinents and the remnants of oceanic crust, which fused together into a tectonically complex but resource rich land mass during the Paleozoic, before becoming draped in thick, primarily marine sedimentary units.
The geology of Lithuania consists of ancient Proterozoic basement rock overlain by thick sequences of Paleozoic, Mesozoic and Cenozoic marine sedimentary rocks, with some oil reserves, abundant limestone, dolomite, phosphorite and glauconite. Lithuania is a country in the Baltic region of northern-eastern Europe.
The Greater Green River Basin (GGRB) is a 21,000 square mile basin located in Southwestern Wyoming. The Basin was formed during the Cretaceous period sourced by underlying Permian and Cretaceous deposits. The GGRB is host to many anticlines created during the Laramide Orogeny trapping many of its hydrocarbon resources. It is bounded by the Rawlins Uplift, Uinta Mountains, Sevier overthrust belt, Sierra Madre Mountains, and the Wind River Mountain Range. The Greater Green River Basin is subdivided into four smaller basins, the Green River Basin, Great Divide Basin, Washakie Basin, and Sand Wash Basin. Each of these possesses hydrocarbons that have been economically exploited. There are 303 named fields throughout the basin, the majority of which produce natural gas; the largest of these gas fields is the Jonah Field.