Natural Wonders of the World
... Different kinds of rocks factor into water erosion. Some rocks are soft and break easily, while other rocks are hard and resist breakage. In the Grand Canyon, the Colorado River flowed downstream, carrying pieces of the softer rocks and leaving behind the harder rocks. Over millions of years, this p ...
... Different kinds of rocks factor into water erosion. Some rocks are soft and break easily, while other rocks are hard and resist breakage. In the Grand Canyon, the Colorado River flowed downstream, carrying pieces of the softer rocks and leaving behind the harder rocks. Over millions of years, this p ...
Outline 4: Sedimentary Rocks
... • Poorly-sorted sediments may indicate weak currents, or transport by glaciers. ...
... • Poorly-sorted sediments may indicate weak currents, or transport by glaciers. ...
Sedimentary Rocks
... • Poorly-sorted sediments may indicate weak currents, or transport by glaciers. ...
... • Poorly-sorted sediments may indicate weak currents, or transport by glaciers. ...
Geologic Time and Stratigraphic Correlation
... cross-cutting cutting and intrusive relationships – unconformities ...
... cross-cutting cutting and intrusive relationships – unconformities ...
New Insights on old rocks: an evolving story of ~two billion years of
... These preserve information on past climates, past river levels, and past landscapes (Crossey et al., 2006) and are an indication of leakage of mantle-derived fluids up faults (originating at surprising depths of >80 km) all across the western U.S. (Newell et al., 2005). Incision rates in the last ha ...
... These preserve information on past climates, past river levels, and past landscapes (Crossey et al., 2006) and are an indication of leakage of mantle-derived fluids up faults (originating at surprising depths of >80 km) all across the western U.S. (Newell et al., 2005). Incision rates in the last ha ...
2 A Grand Canyon
... behind but their rocky bones. I kept walking up, leaving the unconformity behind, and noticed burrows and tracks of simple wormlike animals in the cliff of Tapeats Sandstone through which the trail ran. The fact that marine life was crawling around the bottom of an ancient sea, as documented in the ...
... behind but their rocky bones. I kept walking up, leaving the unconformity behind, and noticed burrows and tracks of simple wormlike animals in the cliff of Tapeats Sandstone through which the trail ran. The fact that marine life was crawling around the bottom of an ancient sea, as documented in the ...
1. THE COLORADO PLATEAU
... million years ago) during which the Colorado Plateau was mainly an ocean, providing a rich marine environment. The deposits we now see are widespread layers of limestone and shale with marine fossils which are locally abundant. Following this period several parts of the Colorado Plateau were moderat ...
... million years ago) during which the Colorado Plateau was mainly an ocean, providing a rich marine environment. The deposits we now see are widespread layers of limestone and shale with marine fossils which are locally abundant. Following this period several parts of the Colorado Plateau were moderat ...
Natural woNders of GeorGia
... the Cretaceous period, about 67 to 70 million years ago. The upper layer of this formation consists of very fine sand mixed with kaolin (a type of white clay). The middle layer is coarser-grained and more colorful, with crossbeds stained yellow by limonite and purple by manganese. The oldest layer i ...
... the Cretaceous period, about 67 to 70 million years ago. The upper layer of this formation consists of very fine sand mixed with kaolin (a type of white clay). The middle layer is coarser-grained and more colorful, with crossbeds stained yellow by limonite and purple by manganese. The oldest layer i ...
Grand Canyon
... Immense gorge cut by the Colorado River into the high plateaus of northwestern Arizona, U.S., noted for its fantastic shapes and coloration. The broad, intricately sculptured chasm of the Grand Canyon contains between its outer walls a multitude of imposing peaks, buttes, canyons, and ravines. It ra ...
... Immense gorge cut by the Colorado River into the high plateaus of northwestern Arizona, U.S., noted for its fantastic shapes and coloration. The broad, intricately sculptured chasm of the Grand Canyon contains between its outer walls a multitude of imposing peaks, buttes, canyons, and ravines. It ra ...
Geologic Map of the Grand Canyon
... Not red, a brown to bluish gray limestone and dolomite, surfaces are stained red from the iron containing formations located above. ...
... Not red, a brown to bluish gray limestone and dolomite, surfaces are stained red from the iron containing formations located above. ...
Transcript: Climbing the Canyon
... Unit 10 GeoMation: Climbing the Canyon At the bottom of The Grand Canyon, deep in its channel, flowing out of the page towards you is the glorious Colorado River. And next to the river, there are rocks that were sediments. They have been lava flows and other things. They have been bent in the heart ...
... Unit 10 GeoMation: Climbing the Canyon At the bottom of The Grand Canyon, deep in its channel, flowing out of the page towards you is the glorious Colorado River. And next to the river, there are rocks that were sediments. They have been lava flows and other things. They have been bent in the heart ...
Hoodoos
... four different geologic periods and a time span of more than 240 million years. Fossils of long-extinct animals and plants have been found embedded in the rock layers. ...
... four different geologic periods and a time span of more than 240 million years. Fossils of long-extinct animals and plants have been found embedded in the rock layers. ...
Geochronology - The Grand Canyon Association
... The clock starts when atoms crystallize from magma into minerals to make an igneous rock. Isotopes are locked inside crystals when magma solidifies. And parent isotopes begin to decay into daughter isotopes By measuring the ratios of parent to daughter isotopes, one can determine the age of the mine ...
... The clock starts when atoms crystallize from magma into minerals to make an igneous rock. Isotopes are locked inside crystals when magma solidifies. And parent isotopes begin to decay into daughter isotopes By measuring the ratios of parent to daughter isotopes, one can determine the age of the mine ...
NAME: ____________________________________ Period: _______ Instructions:
... Bits and pieces of rocks are called particles or grains. One way that geologists classify particles is based on size. What is the name of the largest particle? What is the maximum size of gravel? What is the smallest size of a particle of sand? In the metric system, one meter is divided into 1,000 u ...
... Bits and pieces of rocks are called particles or grains. One way that geologists classify particles is based on size. What is the name of the largest particle? What is the maximum size of gravel? What is the smallest size of a particle of sand? In the metric system, one meter is divided into 1,000 u ...
The Grand Canyon - DiggingDeepIntoScienceLiteracy
... • Drops almost a mile at its deepest point. ...
... • Drops almost a mile at its deepest point. ...
Geology of the Grand Canyon area
The geology of the Grand Canyon area includes one of the most complete and studied sequences of rock on Earth. The nearly 40 major sedimentary rock layers exposed in the Grand Canyon and in the Grand Canyon National Park area range in age from about 200 million to nearly 2 billion years old. Most were deposited in warm, shallow seas and near ancient, long-gone sea shores in western North America. Both marine and terrestrial sediments are represented, including fossilized sand dunes from an extinct desert. There are at least 14 known unconformities in the geologic record found in the Grand Canyon area.Uplift of the region started about 75 million years ago during the Laramide orogeny; a mountain-building event that is largely responsible for creating the Rocky Mountains to the east. In total, the Colorado Plateau was uplifted an estimated 2 miles (3.2 km). The adjacent Basin and Range province to the west started to form about 18 million years ago as the result of crustal stretching. A drainage system that flowed through what is today the eastern Grand Canyon emptied into the now lower Basin and Range province. Opening of the Gulf of California around 6 million years ago enabled a large river to cut its way northeast from the gulf. The new river captured the older drainage to form the ancestral Colorado River, which in turn started to form the Grand Canyon.Wetter climates brought upon by ice ages starting 2 million years ago greatly increased excavation of the Grand Canyon, which was nearly as deep as it is now by 1.2 million years ago. Volcanic activity deposited lava over the area 1.8 million to 500,000 years ago. At least 13 lava dams blocked the Colorado River, forming lakes that were up to 2,000 feet (610 m) deep. The end of the last ice age and subsequent human activity has greatly reduced the ability of the Colorado River to excavate the canyon. Dams in particular have upset patterns of sediment transport and deposition. Controlled floods from Glen Canyon Dam upstream have been conducted to see if they have a restorative effect. Earthquakes and mass wasting erosive events still affect the region.