Castle Hill Field Guide (Teacher version)
... Five million years ago, the rate of uplift accelerated such that the Southern Alps are now rising faster than most other mountain ranges on Earth. If the Alps are rising at an estimated 10-20 millimetres per year and the uplift has been going on for so long, why are the Alps only kilometres high? In ...
... Five million years ago, the rate of uplift accelerated such that the Southern Alps are now rising faster than most other mountain ranges on Earth. If the Alps are rising at an estimated 10-20 millimetres per year and the uplift has been going on for so long, why are the Alps only kilometres high? In ...
Advertising - Science Outreach
... Five million years ago, the rate of uplift accelerated such that the Southern Alps are now rising faster than most other mountain ranges on Earth. If the Alps are rising at an estimated 10-20 millimetres per year and the uplift has been going on for so long, why are the Alps only kilometres high? In ...
... Five million years ago, the rate of uplift accelerated such that the Southern Alps are now rising faster than most other mountain ranges on Earth. If the Alps are rising at an estimated 10-20 millimetres per year and the uplift has been going on for so long, why are the Alps only kilometres high? In ...
Falls Lake geology_from_CGS1994 guidebook
... formationwill be examined in a quarry at Holly Springs, southwest of the map area. The age of the Cary formation is interpreted to be Late Proterozoic based on a preliminary U-Pb zircon age of 574±12 Ma (see article by S.A. Goldberg in this guidebook) as well as similarity and proximity to volcanoge ...
... formationwill be examined in a quarry at Holly Springs, southwest of the map area. The age of the Cary formation is interpreted to be Late Proterozoic based on a preliminary U-Pb zircon age of 574±12 Ma (see article by S.A. Goldberg in this guidebook) as well as similarity and proximity to volcanoge ...
GY 111 Lecture Note Series Mountain Building 1
... another. The Cordilleran Mountains1 of western North America and the Andes of western South America are the result of oceanic-continental plate collisions. The Himalayas are the result of a continent-continent collision (India-Asia). Transform plate boundaries also result in impressive mountains as ...
... another. The Cordilleran Mountains1 of western North America and the Andes of western South America are the result of oceanic-continental plate collisions. The Himalayas are the result of a continent-continent collision (India-Asia). Transform plate boundaries also result in impressive mountains as ...
Geology of the Precambrian Sangre De Cristo Range of New Mexico
... -It was a prolonged thermotectonic episode resulting from collision, subduction, and continued convergence. -This occurred along the paleosuture known as the Cheyenne Belt along the Archean Wyoming ...
... -It was a prolonged thermotectonic episode resulting from collision, subduction, and continued convergence. -This occurred along the paleosuture known as the Cheyenne Belt along the Archean Wyoming ...
Geology of Paraná
... massive sequence of sedimentary and volcanic rocks of Silurian to Cretaceous age that sustains the state's second and third plateaus. In the early stages of the basin´s evolution, South America and Africa were still unseparated parts of a supercontinent called Gondwana, and their geographic location ...
... massive sequence of sedimentary and volcanic rocks of Silurian to Cretaceous age that sustains the state's second and third plateaus. In the early stages of the basin´s evolution, South America and Africa were still unseparated parts of a supercontinent called Gondwana, and their geographic location ...
Faults
... -__________________-the largest mountain systems are part of larger mountain belts (two major belts of the world- Eurasian-Melanesian belt and Circum-Pacific belt) 2.What results when oceanic and continental crust collide? -Volcanic mountains due to subduction of oceanic crust (ex. Cascades Mountain ...
... -__________________-the largest mountain systems are part of larger mountain belts (two major belts of the world- Eurasian-Melanesian belt and Circum-Pacific belt) 2.What results when oceanic and continental crust collide? -Volcanic mountains due to subduction of oceanic crust (ex. Cascades Mountain ...
kittitas valley field trip
... mélange rocks arrived at the subduction zone, they were obducted (thrust over) across the top of the continent along low-angle thrust faults. Some of these great “thrust sheets” may have been thrust for hundreds of kilometers. We suspect that this happened about 90 million years ago. These rocks ove ...
... mélange rocks arrived at the subduction zone, they were obducted (thrust over) across the top of the continent along low-angle thrust faults. Some of these great “thrust sheets” may have been thrust for hundreds of kilometers. We suspect that this happened about 90 million years ago. These rocks ove ...
Fact sheets that describe California`s geomorphic provinces
... California's Geomorphic Provinces California's Geomorphic Provinces:17 California can be divided up into 11 Geomorphic Provinces, many which include volcanic features. The Provinces are: 1. Basin and Range The Basin and Range is the westernmost part of the Great Basin. The province is characterized ...
... California's Geomorphic Provinces California's Geomorphic Provinces:17 California can be divided up into 11 Geomorphic Provinces, many which include volcanic features. The Provinces are: 1. Basin and Range The Basin and Range is the westernmost part of the Great Basin. The province is characterized ...
MMEW Field Trip-99 - University of Minnesota Duluth
... North American continent (Laurentia) to break apart about 1,100 million years ago. Continental rifting is a common and recurring process in the history of the earth that leads to break-up of continents and the formation of ocean basins. A geologically recent example is the ongoing expansion of the A ...
... North American continent (Laurentia) to break apart about 1,100 million years ago. Continental rifting is a common and recurring process in the history of the earth that leads to break-up of continents and the formation of ocean basins. A geologically recent example is the ongoing expansion of the A ...
chapter 11—the mesozoic era
... albedo (482): The fraction of solar energy reflected back into space is termed the Earth’s albedo. channeled scablands (480): With the recession of the glacier, the ice dam broke, and tremendous floods of water rushed out catastrophically across eastern Washington, causing severe erosion and deposit ...
... albedo (482): The fraction of solar energy reflected back into space is termed the Earth’s albedo. channeled scablands (480): With the recession of the glacier, the ice dam broke, and tremendous floods of water rushed out catastrophically across eastern Washington, causing severe erosion and deposit ...
A field guide to the geology of the Castle Hill Basin
... uplift and folding of those sediments. This event is called the Rangitata Orogeny (see glossary). The first collision lasted for 50 million years during which some of the sediments were submerged to great depths where high pressures and temperatures resulted in the transformation (metamorphism) of t ...
... uplift and folding of those sediments. This event is called the Rangitata Orogeny (see glossary). The first collision lasted for 50 million years during which some of the sediments were submerged to great depths where high pressures and temperatures resulted in the transformation (metamorphism) of t ...
Advertising - Science Outreach
... uplift and folding of those sediments. This event is called the Rangitata Orogeny (see glossary). The first collision lasted for 50 million years during which some of the sediments were submerged to great depths where high pressures and temperatures resulted in the transformation (metamorphism) of t ...
... uplift and folding of those sediments. This event is called the Rangitata Orogeny (see glossary). The first collision lasted for 50 million years during which some of the sediments were submerged to great depths where high pressures and temperatures resulted in the transformation (metamorphism) of t ...
Essay: “Where Is (and Was) Pennsylvania?”
... “Pennsylvania” on the Earth’s surface some 1.2 billion years ago in the later stages of the Precambrian Era. A lot had gone on during the 3.5 to 4 billion years of this era: oceans and continents had formed, life had come in being, although it was still confined to the oceans, and an atmosphere co ...
... “Pennsylvania” on the Earth’s surface some 1.2 billion years ago in the later stages of the Precambrian Era. A lot had gone on during the 3.5 to 4 billion years of this era: oceans and continents had formed, life had come in being, although it was still confined to the oceans, and an atmosphere co ...
Geology Background booklet
... Sedimentary rocks are made from sediments (eroded pebbles, sand, silt, clay, and plant and animal remains) that have been deposited in layers and compacted under land or sea. Examples of sedimentary rocks include sandstone, conglomerate, mudstone, shale, chert, chalk, and limestone. Metamorphic rock ...
... Sedimentary rocks are made from sediments (eroded pebbles, sand, silt, clay, and plant and animal remains) that have been deposited in layers and compacted under land or sea. Examples of sedimentary rocks include sandstone, conglomerate, mudstone, shale, chert, chalk, and limestone. Metamorphic rock ...
Geology of the Rogue Valley
... The names for the three rock types—igneous, sedimentary, and metamorphic— refer to the way each rock is formed. Igneous rocks form when molten rock (melted by Earth’s internal heat) cools. Extrusive igneous rock forms when molten lava cools quickly on the earth’s surface after a volcanic eruption. L ...
... The names for the three rock types—igneous, sedimentary, and metamorphic— refer to the way each rock is formed. Igneous rocks form when molten rock (melted by Earth’s internal heat) cools. Extrusive igneous rock forms when molten lava cools quickly on the earth’s surface after a volcanic eruption. L ...
an overview of the geology of the great lakes basin
... interbedded sedimentary rocks. Intrusions of basaltic magma formed dikes, sills, and a large layered complex intrusive body and are notable hosting for nickel, copper, and platinum-group elements deposits. Active Midcontinent rifting and its associated volcanism was followed by continued downwarping ...
... interbedded sedimentary rocks. Intrusions of basaltic magma formed dikes, sills, and a large layered complex intrusive body and are notable hosting for nickel, copper, and platinum-group elements deposits. Active Midcontinent rifting and its associated volcanism was followed by continued downwarping ...
Geologic Time Part I: Relative Dating
... Think about Mercer Island. When where our glacial sediments deposited? About 15,000 years ago. When do you expect to see more sediment deposited over University Hill? 60,000 years in the future during the next glacial cycle. That’s 75,000 years between depositional events! ...
... Think about Mercer Island. When where our glacial sediments deposited? About 15,000 years ago. When do you expect to see more sediment deposited over University Hill? 60,000 years in the future during the next glacial cycle. That’s 75,000 years between depositional events! ...
The Qaidam basin in Western China: monitoring
... maximum 16, in average 6 – 8 kilometers thick basin fill. It was initially formed during Paleocene/Eocene, started to subside mainly during early Oligocene, is active at present comprising up to ca. 3,500 meter thick Quaternary sediments, and displays prominent Pliocene to Recent contractional defor ...
... maximum 16, in average 6 – 8 kilometers thick basin fill. It was initially formed during Paleocene/Eocene, started to subside mainly during early Oligocene, is active at present comprising up to ca. 3,500 meter thick Quaternary sediments, and displays prominent Pliocene to Recent contractional defor ...
The Australian North West Shelf
... decrease density and thus suppress subsidence. In addition, the process of multiphase extension with relatively long time periods between events (see Figure 5) means that the thermal effects of previous rift events will be largely dissipated by the time of the next event, and that both deep sediment ...
... decrease density and thus suppress subsidence. In addition, the process of multiphase extension with relatively long time periods between events (see Figure 5) means that the thermal effects of previous rift events will be largely dissipated by the time of the next event, and that both deep sediment ...
Outline 4: Sedimentary Rocks
... • Generally speaking, higher energy water or wind currents are required to move larger grain sizes. ...
... • Generally speaking, higher energy water or wind currents are required to move larger grain sizes. ...
Sedimentary Rocks
... • Generally speaking, higher energy water or wind currents are required to move larger grain sizes. ...
... • Generally speaking, higher energy water or wind currents are required to move larger grain sizes. ...
Weathering, Erosion, Deposition, and Lithification: Or How to Make a
... Continental shelf: The area between the shore and the top of the continental slope. Continental slope: The inclined area between the continental shelf and the deep ocean: it averages about six degrees from the horizontal. Delta: Flat, commonly triangular, alluvial deposit occurring at the mouth of a ...
... Continental shelf: The area between the shore and the top of the continental slope. Continental slope: The inclined area between the continental shelf and the deep ocean: it averages about six degrees from the horizontal. Delta: Flat, commonly triangular, alluvial deposit occurring at the mouth of a ...
Genesis of the Caballo and Burro Mountains REE
... with pegmatite and aplite dikes, mafic xenoliths and complex textural variations in the host rock suggest that episyenites may be emplaced/formed near the margins of older plutons. Textural, mineralogical and chemical variations between granitic basement, episyenite and transitional rocks were chara ...
... with pegmatite and aplite dikes, mafic xenoliths and complex textural variations in the host rock suggest that episyenites may be emplaced/formed near the margins of older plutons. Textural, mineralogical and chemical variations between granitic basement, episyenite and transitional rocks were chara ...
Geology of the Death Valley area
The exposed geology of the Death Valley area presents a diverse and complex set of at least 23 formations of sedimentary units, two major gaps in the geologic record called unconformities, and at least one distinct set of related formations geologists call a group. The oldest rocks in the area that now includes Death Valley National Park are extensively metamorphosed by intense heat and pressure and are at least 1700 million years old. These rocks were intruded by a mass of granite 1400 Ma (million years ago) and later uplifted and exposed to nearly 500 million years of erosion.Marine deposition occurred 1200 to 800 Ma, creating thick sequences of conglomerate, mudstone, and carbonate rock topped by stromatolites, and possibly glacial deposits from the hypothesized Snowball Earth event. Rifting thinned huge roughly linear parts of the supercontinent Rodinia enough to allow sea water to invade and divide its landmass into component continents separated by narrow straits. A passive margin developed on the edges of these new seas in the Death Valley region. Carbonate banks formed on this part of the two margins only to be subsided as the continental crust thinned until it broke, giving birth to a new ocean basin. An accretion wedge of clastic sediment then started to accumulate at the base of the submerged precipice, entombing the region's first known fossils of complex life. These sandy mudflats gave way about 550 Ma to a carbonate platform which lasted for the next 300 million years of Paleozoic time.The passive margin switched to active margin in the early-to-mid Mesozoic when the Farallon Plate under the Pacific Ocean started to dive below the North American Plate, creating a subduction zone; volcanoes and uplifting mountains were created as a result. Erosion over many millions of years created a relatively featureless plain. Stretching of the crust under western North America started around 16 Ma and is thought to be caused by upwelling from the subducted spreading-zone of the Farallon Plate. This process continues into the present and is thought to be responsible for creating the Basin and Range province. By 2 to 3 million years ago this province had spread to the Death Valley area, ripping it apart and creating Death Valley, Panamint Valley and surrounding ranges. These valleys partially filled with sediment and, during colder periods during the current ice age, with lakes. Lake Manly was the largest of these lakes; it filled Death Valley during each glacial period from 240,000 years ago to 10,000 years ago. By 10,500 years ago these lakes were increasingly cut off from glacial melt from the Sierra Nevada, starving them of water and concentrating salts and minerals. The desert environment seen today developed after these lakes dried up.