Geologic and Related Photographs of the Grand Canyon Region (1967–2010)

To mark this occasion, here are some facts about one of the world’s most amazing natural landmarks. It was formed by water erosion of the Colorado River. It is believed the river made its course through the canyon about six million years ago. The canyon is a massive miles long, 18 miles wide and one mile deep. It’s not the deepest in the world though. Because of all the layers of rock visible down the sides of the canyon as the river has eroded away at the land, it is an extremely important place for geological research. It is one of the most studied geological areas on Earth, with rocks dating back almost two billion years. In , an army lieutenant called Joseph Christmas Ives was the first person to explore the canyon.

13 Things You Didn’t Know About Grand Canyon National Park

Slopes of Dox Formation near Unkar Creek. How was it formed? The truth is that no one knows for sure though there are some pretty good guesses. The chances are that a number of processes combined to create the views that you see in todays Grand Canyon. The most powerful force to have an impact on the Grand Canyon is erosion, primarily by water and ice and second by wind.

to how the Grand Canyon that visitors see today was actually formed. Modern technology and rock-dating techniques have begun to provide.

Nicolaus Steno introduced basic principles of stratigraphy , the study of layered rocks, in William Smith , working with the strata of English coal Former swamp-derived plant material that is part of the rock record. The figure of this geologic time scale shows the names of the units and subunits. Using this time scale, geologists can place all events of Earth history in order without ever knowing their numerical ages.

The specific events within Earth history are discussed in Chapter 8. A Geologic Time Scale Relative dating is the process of determining if one rock or geologic event is older or younger than another, without knowing their specific ages—i. The principles of relative time are simple, even obvious now, but were not generally accepted by scholars until the scientific revolution of the 17th and 18th centuries.

New research suggests Grand Canyon is ‘younger’ rather than ‘older’

For more than a century, tourists from all over the world have visited the Grand Canyon to experience its awe-inspiring vistas. As we celebrate nearly years of protecting this special place, check out 13 great facts about this Arizona icon. The Grand Canyon is bigger than the state of Rhode Island. The Grand Canyon is a mile deep, miles long and 18 miles wide. In comparison, Rhode Island is around 1, square miles. The Grand Canyon itself can influence the weather.

However, using new results from a rock-dating method called “thermochronology,​” which measures erosion when deeper rocks are brought near.

Toggle navigation ScienceBase-Catalog. Your browser does not have support for cookies enabled. Some features of this application will not work. Billingsley, G. Summary The Grand Canyon geologic field photograph collection contains 1, geotagged photographs collected during 43 years of geologic mapping from to The photographs document some key geologic features, structures, and rock unit relations that were used to compile nine geologic maps of the Grand Canyon region published at , scale, and many more maps published at , scale.

Metadata for each photograph include description, date captured, coordinates, and a keyword system that places each photograph in one or more of the following categories: arches and windows, breccia pipes and collapse structures, faults and folds, igneous rocks, landslides and rockfalls, metamorphic rocks, sedimentary rocks, sinkholes, and springs [ Metadata for each photograph include description, date captured, coordinates, and a keyword system that places each photograph in one or more of the following categories: arches and windows, breccia pipes and collapse structures, faults and folds, igneous rocks, landslides and rockfalls, metamorphic rocks, sedimentary rocks, sinkholes, and springs and waterfalls.

Where photographs fit into multiple categories, they are duplicated with different captions to explain the visible features. These data are displayed in an interactive online map in the following publication: Billingsley, G. View children in Folder Search children. About All photographs. Click on title to download individual files attached to this item. Rights Public domain.

Module 9 Assignment

When asked to imagine the biggest, deepest, longest canyon one can imagine, an image of the Grand Canyon will often pop into a person’s mind. The Grand Canyon is a site of almost unfathomable grandeur, which inspires awe in anyone who sees it. Lately, however, the canyon has also inspired controversy, specifically over its origins. It is generally held by the scientific community that the Grand Canyon formed by the slow erosion of the Colorado River over millions of years.

It is one of the most studied geological areas on Earth, with rocks dating back almost two billion years. 4. In , an army lieutenant called.

Deep inside the Inner Gorge of Grand Canyon, northern Arizona, are the crystalline basement rocks that probably date back even to the Creation Week itself. Clearly visible in the canyon walls are the light-colored granites, such as the Zoroaster Granite, which are stark against the darker, folded strata of the Vishnu Schist and the other metamorphic rock units of the Granite Gorge Metamorphic Suite 1 see lowest purple and green shading in diagram.

These are former sedimentary and volcanic strata that have been transformed by heat and pressure, possibly during the intense upheavals when the dry land was formed on Day 3 of Creation Week. These were originally basalt lava flows several meters to tens of meters thick. In some outcrops pillow structures have been preserved, testimony to the basalt lavas having originally erupted and flowed under water onto the Creation Week ocean floor.

Metamorphic rocks are not always easy to date using radio-isotopes. Results obtained usually signify the “date” of the metamorphism, but they may also yield the “age” of the original volcanic or sedimentary rock. The “age” or “date” is calculated from the amount of the daughter isotope produced by radioactive decay of the parent isotope. In Grand Canyon, the “date” of metamorphism of the basalt lavas to form these Brahma amphibolites has been determined as Ma million years ago , based on U-Pb dating of minerals in the overlying Vishnu Schist and underlying Rama Schist that formed during the metamorphism.

These included seven samples from a meter long and 2 meter wide amphibolite body outcropping just upstream from the mouth of Clear Creek at river mile 84 measured from Lees Ferry. All 27 samples were sent to two well-credentialed internationally-recognized, commercial laboratories for radioisotope analyses—potassium-argon K-Ar at a Canadian laboratory, and rubidium-strontium Rb-Sr , samarium-neodymium Sm-Nd , and lead-lead Pb-Pb , at an Australian laboratory.

Geology and Ecology of National Parks

The Grand Canyon is a mile-deep, mile wide, mile long 1. The colorful spires, the rocky cliffs, the hidden pocket canyons, the pristine springs laying down lovely deposits, the roaring thunderstorms and arching rainbows are to many the quintessence of the U. When the author, his cousin Chuck, and his sister, Sharon, were hiking the Bright Angel Trail from the North Rim into the canyon, a snake crossed the trail and slithered into some dry grass just at the trail edge.

Sharon, just behind, was not aware of the snake until it stuck its head out and rattled the grass just at her feet. Deciding that discretion was the better part of valor, and that if it rattles like a rattler it might actually be one, she made one mighty leap backward, landing in a cloud of dust on a switchback below. Sharon almost certainly was not concerned with the rocks about her at that instant, but she had leaped backward through history.

For geologists, the Grand Canyon is one of the most spectacular natural of rivers to erode landscapes, the walls of the canyon reveal rock strata that date from.

Las Vegas Valley rock layer matches that of a famous interval of rocks at the Grand Canyon; findings reported in the journal Geology. Rock formations are significant for geologists, and formation names help keep track of time and events in Earth history. A new name — Frenchman Mountain Dolostone — has been added to a key interval of rocks in the Grand Canyon.

Frenchman Mountain is a large mountain on the east side of the Las Vegas Valley. Many locals mistakenly call it Sunrise Mountain which is actually the name of the lower peak behind nearby Nellis Air Force Base. Even though Frenchman Mountain is 60 miles from the mouth of the Grand Canyon, an important connection exists between these two geologic features, and geologists have now formally linked them together.

In a study published in the May edition of the journal Geology , a team of geologists from several western universities and museums, including a researcher from UNLV, have redefined a famous interval of rocks in the Grand Canyon — the Tonto Group — by adding to it the name Frenchman Mountain Dolostone. Steve Rowland, an emeritus professor of geology at UNLV and a co-author of the paper, and former graduate student Slava Korolev proposed the name Frenchman Mountain Dolostone several years ago.

They traced this Cambrian-age layer of rocks from one mountain range to another across the Lake Mead region and deep into the Grand Canyon. The surprise is that the interval within the Tonto Group where it belongs has never been formally named, so now it has a proper name. The research paper now redefines the Tonto Group to include layers above and below that were poorly understood.

The Sixtymile Formation is added to the bottom and the Frenchman Mountain Dolostone to the top, and it also adds new radiometric dating.

A deeper understanding of the Grand Canyon

The canyon itself is made up of rock layers that are millions and, in some cases, billions of years old, with each layer representing a different geological time period. But the actual carving of the canyon and when it began to resemble the Grand Canyon as we know it today is a bit harder to pin down. One thing geologists can agree on is the age of the layers of rock that make up the walls of the Grand Canyon.

The youngest layer of the canyon—the Kaibab—is million years old, while the oldest layers date back as far as 1.

The three main rock layer sets in the Grand Canyon are grouped based on position and common composition and 1) Metamorphic basement rocks, 2) The.

The Grand Canyon is one of the supreme geologic laboratories on Earth and, after about years of geologic investigation, one might think that its secrets have been mostly resolved. This is especially true of the flat-lying layered rocks that are so visible from both rims within Grand Canyon National Park. Nearly five decades ago, in the late s, was the last time a new formation was discovered and defined in the Grand Canyon with the discovery of the Surprise Canyon Formation.

Their research paper, recently published in Nature Geoscience , titled “Cambrian Sauk transgression in the Grand Canyon region redefined by detrital zircons”, found the Sixtymile Formation sandstone to be much younger than previously thought. This unit occurs in only four outcrops in a remote and relatively inaccessible section of eastern Grand Canyon.

The Sauk marine Transgression occurred during a period of time dating from the to million years ago when the sea level rose across North America leaving behind zircons, commonly found in sand, that contain trace amounts of uranium and thorium mineral deposits within specific sedimentary units enabling researchers to date the deposits.

Radioisotope dating of rocks in the Grand Canyon


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