Share
VIDEOS 1 TO 50
Rockies Thrust Up | National Geographic
Rockies Thrust Up | National Geographic
Published: 2008/02/07
Channel: National Geographic
Historical Geology: Mesozoic, Laramide Orogeny
Historical Geology: Mesozoic, Laramide Orogeny
Published: 2014/08/12
Channel: DCC - Geology Online
Laramide orogeny
Laramide orogeny
Published: 2016/09/04
Channel: WikiWikiup
Laramide Orogeny
Laramide Orogeny
Published: 2017/05/05
Channel: Sara Flores
Laramie Orogeny by Dr. Paul Heller, PhD University of Wyoming
Laramie Orogeny by Dr. Paul Heller, PhD University of Wyoming
Published: 2016/05/19
Channel: Geologists of Jackson Hole
Rocky Mountain Formation by Eric Erslev, UW/CSU
Rocky Mountain Formation by Eric Erslev, UW/CSU
Published: 2016/04/13
Channel: Geologists of Jackson Hole
Compression during the Laramide orogeny
Compression during the Laramide orogeny
Published: 2014/08/05
Channel: Virtual Field Trips
Laramide Orogeny Clarification
Laramide Orogeny Clarification
Published: 2017/06/19
Channel: Matthew Clay
How the Rockies were formed
How the Rockies were formed
Published: 2016/02/20
Channel: Mr.Duncan's Social Studies Channel
Impact of Laramide Movements on Northern Hemisphere Hydrocarbon Systems
Impact of Laramide Movements on Northern Hemisphere Hydrocarbon Systems
Published: 2012/08/02
Channel: HGSGeoEducation
Flatirons of Boulder Colorado
Flatirons of Boulder Colorado
Published: 2012/09/19
Channel: AirRaid Aerials
Importance of the Laramide uplift
Importance of the Laramide uplift
Published: 2014/09/03
Channel: Virtual Field Trips
The Grenville Orogeny and rifting of Rodinia, Virginia
The Grenville Orogeny and rifting of Rodinia, Virginia
Published: 2012/05/29
Channel: Callan Bentley
Versus The Collective -- Laramide Orogeny
Versus The Collective -- Laramide Orogeny
Published: 2011/06/15
Channel: HeavyMetalRhino
The Rocky Mountain
The Rocky Mountain
Published: 2014/12/08
Channel: Brian C
Colorado Laramide Highlands at 57 million years
Colorado Laramide Highlands at 57 million years
Published: 2012/11/29
Channel: igpcolorado
Documental así se hizo la tierra Las Montañas Rocosas
Documental así se hizo la tierra Las Montañas Rocosas
Published: 2017/02/11
Channel: Documentales HD
Historical Geology: Mesozoic, Nevadan Orogeny
Historical Geology: Mesozoic, Nevadan Orogeny
Published: 2014/08/12
Channel: DCC - Geology Online
Bicycle on Rocky Mountain
Bicycle on Rocky Mountain
Published: 2017/10/10
Channel: Diana Blackfyre 2.0
Bill Rehrig Preview - Discoveries 2017
Bill Rehrig Preview - Discoveries 2017
Published: 2017/06/06
Channel: Mexico Mining Center
Bearthooth Highway - Wyoming
Bearthooth Highway - Wyoming's Cultural Geology Guide
Published: 2015/10/27
Channel: Wyoming Geological Survey
Grand Canyon Formation
Grand Canyon Formation
Published: 2010/06/25
Channel: PeakPixels
Laramide Resources (LAM.TO) Could Be Large Australian Uranium Producer
Laramide Resources (LAM.TO) Could Be Large Australian Uranium Producer
Published: 2014/02/05
Channel: goldstocktrades
How The Rocky Mountains Were Formed?
How The Rocky Mountains Were Formed?
Published: 2017/11/10
Channel: Kloot Kubw
St. Nullimnesia - Cimmerian Orogeny
St. Nullimnesia - Cimmerian Orogeny
Published: 2013/11/21
Channel: Saint Nullimnesia
Geology of the Northern Rockies Field Course
Geology of the Northern Rockies Field Course
Published: 2015/09/24
Channel: Evan Lavery
Hypothetical Orogeny: An Illustration of Tectonic Cycles and Mountain Building
Hypothetical Orogeny: An Illustration of Tectonic Cycles and Mountain Building
Published: 2015/09/19
Channel: Πεύκο Ο
Orogeny
Orogeny
Published: 2015/01/20
Channel: Evoken - Topic
Historical Geology: Mesozoic, Alleghanian Orogeny
Historical Geology: Mesozoic, Alleghanian Orogeny
Published: 2014/08/12
Channel: DCC - Geology Online
What is EPEIROGENIC MOVEMENT? What does EPEIROGENIC MOVEMENT mean? EPEIROGENIC MOVEMENT meaning
What is EPEIROGENIC MOVEMENT? What does EPEIROGENIC MOVEMENT mean? EPEIROGENIC MOVEMENT meaning
Published: 2017/10/13
Channel: The Audiopedia
Plate Tectonics  400 Ma to Today  by CR Scotese
Plate Tectonics 400 Ma to Today by CR Scotese
Published: 2017/11/07
Channel: Christopher Scotese
From Denver to Aspen, Rocky Mountains, U.S. Route 6, Colorado, United States, North America
From Denver to Aspen, Rocky Mountains, U.S. Route 6, Colorado, United States, North America
Published: 2013/07/05
Channel: Pietro Pecco
Historical Geology: Mesozoic, Sevier Orogeny
Historical Geology: Mesozoic, Sevier Orogeny
Published: 2014/08/12
Channel: DCC - Geology Online
the Rockies - nature documentary (1976)
the Rockies - nature documentary (1976)
Published: 2017/02/12
Channel: TeNNeT RD
Himalayas in New York: The Grenville Orogeny
Himalayas in New York: The Grenville Orogeny
Published: 2015/04/16
Channel: Gabe Gabeler
Red Rocks - In A Colorado Minute (Week 237)
Red Rocks - In A Colorado Minute (Week 237)
Published: 2016/08/04
Channel: Moving Postcard
Plate Tectonics 300 Ma to Today by CR Scotese
Plate Tectonics 300 Ma to Today by CR Scotese
Published: 2017/11/07
Channel: Christopher Scotese
Growth and erosion of an orogenic wedge (re-upload)
Growth and erosion of an orogenic wedge (re-upload)
Published: 2014/02/12
Channel: TheGeoModels
Rocky Mountains
Rocky Mountains
Published: 2016/08/28
Channel: WikiWikiup
Mt  Princeton (Standard Route)
Mt Princeton (Standard Route)
Published: 2017/02/01
Channel: Thomas Benson
Historical Geology: Late Paleozoic, Antler Orogeny
Historical Geology: Late Paleozoic, Antler Orogeny
Published: 2014/08/12
Channel: DCC - Geology Online
Caledonian orogenic belt
Caledonian orogenic belt
Published: 2016/01/16
Channel: My Channels (global)
What Were The Major Events In The Cenozoic Era?
What Were The Major Events In The Cenozoic Era?
Published: 2017/10/11
Channel: Bet 2 Bet
Andean orogenic growth kinematic evolution, feedbacks between tectonics and climate - Slow version
Andean orogenic growth kinematic evolution, feedbacks between tectonics and climate - Slow version
Published: 2015/11/04
Channel: LabEx UnivEarthS
Exploring The Colorado Rocky Mountains with Bill Boggs
Exploring The Colorado Rocky Mountains with Bill Boggs
Published: 2016/08/02
Channel: BillBoggsTV
Oil Fields - American Frontier (1953) American Petroleum Institute; Williston Basin, North Dakota
Oil Fields - American Frontier (1953) American Petroleum Institute; Williston Basin, North Dakota
Published: 2017/01/05
Channel: Old Movies Reborn
Orogeny - Video Learning - WizScience.com
Orogeny - Video Learning - WizScience.com
Published: 2015/09/02
Channel: Wiz Science™
Hiking Mosquito Range.
Hiking Mosquito Range.
Published: 2010/09/22
Channel: videofilmik
Model Mountain Range: bivergent orogenic wedge experiment
Model Mountain Range: bivergent orogenic wedge experiment
Published: 2015/05/03
Channel: TheGeoModels
Dinosaur National Monument - Video Learning - WizScience.com
Dinosaur National Monument - Video Learning - WizScience.com
Published: 2015/08/06
Channel: Wiz Science™
NEXT
GO TO RESULTS [51 .. 100]

WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
Jump to: navigation, search

The Laramide orogeny was a period of mountain building in western North America, which started in the Late Cretaceous, 70 to 80 million years ago, and ended 35 to 55 million years ago. The exact duration and ages of beginning and end of the orogeny are in dispute. The Laramide orogeny occurred in a series of pulses, with quiescent phases intervening. The major feature that was created by this orogeny was deep-seated, thick-skinned deformation, with evidence of this orogeny found from Canada to northern Mexico, with the easternmost extent of the mountain-building represented by the Black Hills of South Dakota. The phenomenon is named for the Laramie Mountains of eastern Wyoming. The Laramide orogeny is sometimes confused with the Sevier orogeny, which partially overlapped in time and space.[1]

The Laramide orogeny was caused by subduction of a plate at a shallow angle.

The orogeny is commonly attributed to events off the west coast of North America, where the Kula and Farallon Plates were sliding under the North American plate. Most hypotheses propose that oceanic crust was undergoing flat-slab subduction, i.e., with a shallow subduction angle, and as a consequence, no magmatism occurred in the central west of the continent, and the underlying oceanic lithosphere actually caused drag on the root of the overlying continental lithosphere. One cause for shallow subduction may have been an increased rate of plate convergence. Another proposed cause was subduction of thickened oceanic crust.

Magmatism associated with subduction occurred not near the plate edges (as in the volcanic arc of the Andes, for example), but far to the east, called the Coast Range Arc. Geologists call such a lack of volcanic activity near a subduction zone a magmatic null. This particular null may have occurred because the subducted slab was in contact with relatively cool continental lithosphere, not hotter asthenosphere.[2] One result of shallow angle of subduction and the drag that it caused was a broad belt of mountains, some of which were the progenitors of the Rocky Mountains. Part of the proto-Rocky Mountains would be later modified by extension to become the Basin and Range Province.

Ecological consequences[edit]

According to paleontologist Thomas M. Lehman, the Laramide orogeny triggered "the most dramatic event that affected Late Cretaceous dinosaur communities in North America prior to their extinction."[3] This turnover event saw the replacement of specialized and highly ornamented centrosaurine and lambeosaurines by more primitive upland dinosaurs in the south, while northern biomes became dominated by Triceratops with a greatly reduced hadrosaur community.[4]

Basins and mountains[edit]

The Laramide orogeny produced intermontane structural basins and adjacent mountain blocks by means of deformation. This style of deformation is typical of continental plates adjacent to convergent margins of long duration that have not sustained continent/continent collisions. This tectonic setting produces a pattern of compressive uplifts and basins, with most of the deformation confined to block edges. Twelve kilometers of structural relief between basins and adjacent uplifts is not uncommon. The basins contain several thousand meters of Paleozoic and Mesozoic sedimentary rocks that predate the Laramide orogeny. As much as 5,000 meters (16,000 ft) of Cretaceous and Cenozoic sediments filled these orogenically-defined basins. Deformed Paleocene and Eocene deposits record continuing orogenic activity.[5]

During the Laramide orogeny, basin floors and mountain summits were much closer to sea level than today. After the seas retreated from the Rocky Mountain region, floodplains, swamps, and vast lakes developed in the basins. Drainage systems imposed at that time persist today. Since the Oligocene, episodic epeirogenic uplift gradually raised the entire region, including the Great Plains, to present elevations. Most of the modern topography is the result of Pliocene and Pleistocene events, including additional uplift, glaciation of the high country, and denudation and dissection of older Cenozoic surfaces in the basin by fluvial processes.[5]

Topographic map of the Bighorn Basin (highlighted in orange), formed by the Laramide Orogeny

In the United States, these distinctive intermontane basins occur principally in the central Rocky Mountains from Colorado and Utah (Uinta Basin) to Montana and are best developed in Wyoming, with the Big Horn, Powder River, and Wind River being the largest. Topographically, the basin floors resemble the surface of the western Great Plains, except for vistas of surrounding mountains.[5]

At most boundaries, Paleozoic through Paleogene units dip steeply into the basins off uplifted blocks cored by Precambrian rocks. The eroded steeply dipping units form hogbacks and flatirons. Many of the boundaries are thrust or reverse faults. Although other boundaries appear to be monoclinal flexures, faulting is suspected at depth. Most bounding faults show evidence of at least two episodes of Laramide (Late Cretaceous and Eocene) movement, suggesting both thrust and strike-slip types of displacement.[5]

See also[edit]

Footnotes[edit]

References[edit]

External links[edit]

Disclaimer

None of the audio/visual content is hosted on this site. All media is embedded from other sites such as GoogleVideo, Wikipedia, YouTube etc. Therefore, this site has no control over the copyright issues of the streaming media.

All issues concerning copyright violations should be aimed at the sites hosting the material. This site does not host any of the streaming media and the owner has not uploaded any of the material to the video hosting servers. Anyone can find the same content on Google Video or YouTube by themselves.

The owner of this site cannot know which documentaries are in public domain, which has been uploaded to e.g. YouTube by the owner and which has been uploaded without permission. The copyright owner must contact the source if he wants his material off the Internet completely.

Powered by YouTube
Wikipedia content is licensed under the GFDL and (CC) license