File
... Discovery of underwater plate boundary ridges where new crust is formed (like the Mid Atlantic Ridge) Paleomagnetic evidence Earth’s magnetic field reverses every few thousand years Leaves traces in the rocks of emerging crust – “bands” that move out from the plate boundary New data on glo ...
... Discovery of underwater plate boundary ridges where new crust is formed (like the Mid Atlantic Ridge) Paleomagnetic evidence Earth’s magnetic field reverses every few thousand years Leaves traces in the rocks of emerging crust – “bands” that move out from the plate boundary New data on glo ...
1 billion years ago
... deposited in the rift valley. The flood basalt lavas that erupted along the rifts are now preserved as traprock ridges. One lava flow was about 200 meters (over 600 feet) thick! Dinosaurs roamed the Connecticut valley and left footprints along the muddy margins of rift valley lakes. One type of larg ...
... deposited in the rift valley. The flood basalt lavas that erupted along the rifts are now preserved as traprock ridges. One lava flow was about 200 meters (over 600 feet) thick! Dinosaurs roamed the Connecticut valley and left footprints along the muddy margins of rift valley lakes. One type of larg ...
Timeline for Core Geology
... French Academy of Sciences. 1760 - John Michell suggests earthquakes are caused by one layer of rocks rubbing against another 1776 - James Keir suggests that some rocks might have been formed by the crystallisation of molten lava 1779 - Comte de Buffon speculates that the Earth is older than the 6,0 ...
... French Academy of Sciences. 1760 - John Michell suggests earthquakes are caused by one layer of rocks rubbing against another 1776 - James Keir suggests that some rocks might have been formed by the crystallisation of molten lava 1779 - Comte de Buffon speculates that the Earth is older than the 6,0 ...
Simple Impact Craters
... surface material and that of Earth concerns the most common kinds of rocks. On the Earth, the most common rocks are sedimentary, because of atmospheric and water erosion of the surface. On the Moon there is no atmosphere to speak of and little or no water, and the most common kind of rock is igneous ...
... surface material and that of Earth concerns the most common kinds of rocks. On the Earth, the most common rocks are sedimentary, because of atmospheric and water erosion of the surface. On the Moon there is no atmosphere to speak of and little or no water, and the most common kind of rock is igneous ...
NATS1311_120408_bw
... - material from deep inside Jupiter was ejected, and fell… left dark spots Such impacts probably occur on Jupiter once every 1,000 years. ...
... - material from deep inside Jupiter was ejected, and fell… left dark spots Such impacts probably occur on Jupiter once every 1,000 years. ...
Immature lunar formations and palaeoregolith deposits as sources
... New formation of modern palaeoregolith (preserved regolith) layers. ...
... New formation of modern palaeoregolith (preserved regolith) layers. ...
CAN IMPACTS INDUCE VOLCANIC ERUPTIONS? by H. J. Melosh
... impact event material is first pushed downward as the transient cavity opens, then rebounds upward. For most target material this excursion is adiabatic, so the amount of uplift effective for pressure melting is only that remaining after the collapse of the transient crater. Numerous field and numer ...
... impact event material is first pushed downward as the transient cavity opens, then rebounds upward. For most target material this excursion is adiabatic, so the amount of uplift effective for pressure melting is only that remaining after the collapse of the transient crater. Numerous field and numer ...
GEOLOGIC TIME
... volcanoes that erupted for centuries • Massive release of CO2 into atmosphere • Temps on planet warmed • Mass extinction of trilobites, eurypterids, fern-like plants and many insects ...
... volcanoes that erupted for centuries • Massive release of CO2 into atmosphere • Temps on planet warmed • Mass extinction of trilobites, eurypterids, fern-like plants and many insects ...
ppt - Earth2Class
... impacts of asteroids, meteorites, and other extraterrestrial objects with us since 2002. Her studies have taken her to many parts of the world, from Australia and New Zealand to the Hudson River and the continental shelf off NJ/NY. Today, she’ll discuss ongoing work in an area about 140 km east of M ...
... impacts of asteroids, meteorites, and other extraterrestrial objects with us since 2002. Her studies have taken her to many parts of the world, from Australia and New Zealand to the Hudson River and the continental shelf off NJ/NY. Today, she’ll discuss ongoing work in an area about 140 km east of M ...
Minor Members
... • Their return can be predicted. • Their tail shows the direction of the sun, not which way they are headed. ...
... • Their return can be predicted. • Their tail shows the direction of the sun, not which way they are headed. ...
While watching the movie video Asteroids, answer the follow
... believe it was a meteor crater? (There are 2.) What type of rock had been altered by the impact and was the clue needed to determine it was an asteroid impact? How long ago do scientists believe the impact occurred? ...
... believe it was a meteor crater? (There are 2.) What type of rock had been altered by the impact and was the clue needed to determine it was an asteroid impact? How long ago do scientists believe the impact occurred? ...
Evolution of Life and Mass Extinctions
... Mass Extinction: Points in geologic time where a large number of species become extinct Although not certain, scientists link many of these mass extinctions to asteroid, comet or meteoroid impact events It is believed that an object from outer space that left a crater in southern Mexico wiped out th ...
... Mass Extinction: Points in geologic time where a large number of species become extinct Although not certain, scientists link many of these mass extinctions to asteroid, comet or meteoroid impact events It is believed that an object from outer space that left a crater in southern Mexico wiped out th ...
CHICXULUB CRATER - University of Colorado Boulder
... (among others) Luis and Walter Alvarez, geologists at the University of California at Berkeley. ...
... (among others) Luis and Walter Alvarez, geologists at the University of California at Berkeley. ...
Chicxulub crater
The Chicxulub crater (/ˈtʃiːkʃʉluːb/; Mayan pronunciation: [tʃʼikʃuluɓ]) is an impact crater buried underneath the Yucatán Peninsula in Mexico. Its center is located near the town of Chicxulub, after which the crater is named. The age of the Chicxulub asteroid impact and the Cretaceous–Paleogene boundary (K–Pg boundary) coincide precisely. The crater is more than 180 kilometers (110 miles) in diameter and 20 km (12 mi) in depth, making the feature one of the largest confirmed impact structures on Earth; the impacting bolide that formed the crater was at least 10 km (6 mi) in diameter.The crater was discovered by Antonio Camargo and Glen Penfield, geophysicists who had been looking for petroleum in the Yucatán during the late 1970s. Penfield was initially unable to obtain evidence that the geological feature was a crater, and gave up his search. Through contact with Alan Hildebrand, Penfield obtained samples that suggested it was an impact feature. Evidence for the impact origin of the crater includes shocked quartz, a gravity anomaly, and tektites in surrounding areas.The age of the rocks marked by the impact shows that this impact structure dates from roughly 66 million years ago, the end of the Cretaceous period, and the start of the Paleogene period. It coincides with the K-Pg boundary, the geological boundary between the Cretaceous and Paleogene. The impact associated with the crater is thus implicated in the Cretaceous–Paleogene extinction event, including the worldwide extinction of non-avian dinosaurs. This conclusion has been the source of controversy. In March 2010, 41 experts from many countries reviewed the available evidence: 20 years' worth of data spanning a variety of fields. They concluded that the impact at Chicxulub triggered the mass extinctions at the K–Pg boundary. In 2013 a study compared isotopes in impact glass from the Chicxulub impact with the same isotopes in ash from the boundary where the extinction event occurred in the fossil record; the study concluded that the impact glasses were dated at 66.038±0.049 Ma, and the deposits immediately above the discontinuity in the geological and fossil record was dated to 66.019±0.021, the two dates being within 32,000 years of each other, or almost exactly the same within experimental error.