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in what sedimentary environment did the supai group sandstone deposit

by Jessica Schroeder Published 3 months ago Updated 2 months ago

The Supai Group was deposited in Pennsylvanian and early Permian time in swampy and riparian environments from clastic sediment mostly derived from the Ancestral Rocky Mountains (the average age of this group is 285 million years).

Full Answer

Where was the Esplanade Sandstone deposited?

By Permian time, the Esplanade Sandstone (Supai Group member 4) was being laid down in northwest Arizona (Grand Canyon), and southwest Utah; the coeval Cedar Mesa Sandstone was being deposited in east Utah. The geologic sequences of the coeval Supai and Hermosa Groups.

What type of rock is the Supai Group?

The Supai Group forms the red stairsteps below the Hermit Shale slopes and above the high red cliffs of the Redwall Limestone. The group comprises four formations composed of rust red sandstones, siltstones, shales and a few limestone beds containing a beautiful red chert called jasper.

What is the name of the Sandstone Formation in Arizona?

Coconino Sandstone is a geologic formation named after its exposure in Coconino County, Arizona. This formation spreads across the Colorado Plateau province of the United States, including northern Arizona, northwest Colorado, Nevada, and Utah . This rock formation is particularly prominent in the Grand Canyon,...

What type of rock is found in the Grand Canyon?

Cliff-forming interbeds ( sandstone) are noticeable throughout the group, as well as the largest cliff-former the topmost member Esplanade Sandstone. The Supai Group is especially exposed throughout the Grand Canyon in northwest Arizona, as well as local regions of southwest Utah ( Virgin River valley region).

In what sedimentary environment did the Tapeats Sandstone deposit?

intertidal marine shelfThe depositional environment of the Tapeats Sandstone is interpreted to have been an intertidal marine shelf bordered by sandy dunes (“National Park Service”).

How was the Supai sandstone formed?

The Supai Group members were created from marine sequences of marine transgression, and regression which produced alternating sandstone, siltstone, and conglomerate subsections. The subsections are sometimes separated by unconformities, due to changing ocean levels, glaciation, or regional subsidence.

What fossils are found in the Supai Group?

The Supai Group is placed in the Paleozoic Era, Mississippian and Pennsylvanian Periods. The fossils there are marine fossils: brachiopods, gastropods, pelecypods,corals,bryozoans, conodonts, sharks.

How old is Supai formation?

about 285 million years oldSupai Formation - This layer averages about 285 million years old and is composed primarily of shale that is intermixed with some small amounts of limestone and capped by sandstone.

Why is sandstone a sedimentary rock?

Sandstone is a type of rock made from sediment — a sedimentary rock. The sediment particles are clasts, or pieces, of minerals and fragments of rock, thus sandstone is a clastic sedimentary rock.

How were the Tapeats Sandstone layers formed?

The Tapeats Sea at the late Cambrian ceased to deposit more Muav Limestone, and a period of erosion ensued, a deposition unconformity. The Tapeats Sandstone was laid upon the Vishnu Basement Rocks, after an unconformity of erosion, the Great Unconformity.

How was the Coconino Sandstone formed?

The Coconino Sandstone formed as the area dried out and sand dunes made of pure quartz sand invaded a growing desert some 260 million years ago (see 6b in figure 1). Today, it is a 375 to 650 ft (115 to 200 m) thick golden white to cream-colored cliff-former near the canyon's rim.

During which period did the Coconino Sandstone form?

PermianIt consists primarily of fine well-sorted quartz grains, with minor amounts of potassium feldspar grains deposited by eolian processes (wind-deposited) approximately 275 million years ago....Coconino SandstoneStratigraphic range: PermianTypeSedimentarySub-unitsHarding Point Sandstone Member, Cave Spring Sandstone11 more rows

What is the oldest sedimentary layer in the Grand Canyon?

Averaging 1250 million years old, this is the oldest layer exposed in the Grand Canyon that contains fossils—stromatolites. Hakatai Shale is made of thin beds of marginal-marine-derived mudstones, sandstones, and shale that, together, are 445 to 985 feet (136 to 300 m) thick.

In what sedimentary environment did the Kaibab limestone deposit?

As the sea returned, the rock layers of the Toroweap Sandstone were created in sandy coastal environments. Finally, as the ocean encroached, the Kaibab Limestone was deposited in quiet, shallow waters.

What type of rock is sandstone?

Sandstone is a type of sedimentary rock. It forms when grains of sand are compacted together over very long periods of time. Normally this sand has an abundance of quartz but can also contain other minerals and materials. Sandstone comes in a variety of colors including red, yellow, gray, and brown.

How old is the Supai Group in the Grand Canyon?

315-285 million yearsSupai Group. View of the Supai Group from along the Bright Angel Trail on the Grand Canyon's South Rim. Age of 315-285 million years.

How was the Coconino sandstone formed?

The Coconino Sandstone formed as the area dried out and sand dunes made of pure quartz sand invaded a growing desert some 260 million years ago (see 6b in figure 1). Today, it is a 375 to 650 ft (115 to 200 m) thick golden white to cream-colored cliff-former near the canyon's rim.

How is MUAV limestone formed?

It is a slope-former, 325 to 400 feet (100 to 120 m) thick. Muav Limestone (averages 515 million years old) – The Muav is made of gray thin-bedded limestone that was deposited further offshore as calcium carbonate precipitates (see 3c in figure 1). It is fossil poor yet trilobites and brachiopods have been found in it.

Are there dinosaur fossils in the Grand Canyon?

Not at Grand Canyon! The rocks of the canyon are older than the oldest known dinosaurs. To see dinosaur fossils, the Triassic-aged Chinle Formation on the Navajo Reservation and at Petrified Forest National Park is the nearest place to go.

How old is Redwall limestone?

340 Million Years Ago340 Million Years Ago: The Redwall Limestone formed. An abundance of marine fossils in this rock layer indicate that it formed on the bottom of an ancient ocean.

What is the Supai group?

The Supai Group forms the red stairsteps below the Hermit Shale slopes and above the high red cliffs of the Redwall Limestone. The group comprises four formations composed of rust red sandstones, siltstones, shales and a few limestone beds containing a beautiful red chert called jasper.

Where is the time boundary between the Permian and Pennsylvanian periods?

The time boundary between the Permian and Pennsylvanian Periods occurs in the Supai Group just beneath the Esplanade Sandstone (see Geologic Time Chart --return with your back button). The Esplanade is Permian; the Wescogame, Manacacha and Watahomigi are Pennsylvanian.

What are the structural features of the eolian sandstone?

Several structural features such as ripple marks, sand dune deposits, rain patches, slump marks, and fossil tracks are not only well preserved within the formation, but also contribute evidence of its eolian origin. Lechatelierite (silica glass), as well as coesite and stishovite (high pressure forms of SiO 2) were formed during the impact ...

How thick is the Grand Canyon?

The thickness of the formation varies due to regional structural features; in the Grand Canyon area it is only 65 feet (20 m) thick in the west , thickens to over 600 feet (180 m) in the middle and then thins to 57 feet (17 m) in the east. Either the Kaibab Limestone or Toroweap Formation overlies the Coconino Sandstone.

Where is the Coconino Plateau?

N. H. Darton, 1910. The Coconino Sandstone forms the two prominent white cliffs in the middle distance in this view from the South Rim of the Grand Canyon. Coconino Sandstone is a geologic formation named after its exposure in Coconino County, Arizona. This formation spreads across the Colorado Plateau province ...

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