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harukas

Relative and absolute ages in the histories of Earth and the Moon: The Geologic Time Scale | The Planetary Society - 0 views

www.planetary.org/...gic-time-scale-earth-moon.html

relative absolute earth time scale

shared by harukas on 26 Jan 16 - No Cached
  • harukas on 26 Jan 16
     
    This website is about the differences between absolute ages and relative ages. Also, it shows the geologic time scales.
aleksandera

Geologic Time and Climate Change Science - 0 views

www.skepticalscience.com/Climate-Change-Sciencertf.html

time dating change

shared by aleksandera on 26 Jan 16 - No Cached
  • janbanaszuk on 26 Jan 16
     
    The article explains the concept of the geological time scale, it compares it to the climate change which had already occurred and  is occurring.
  • aleksandera on 26 Jan 16
     
    This site explains the relative dating.
harukas

Palaeos Proterozoic: The Paleoproterozoic Era - 0 views

palaeos.com/...paleoproterozoic.html

Proterozoic

shared by harukas on 26 Jan 16 - No Cached
  • It was during the Paleoproterozoic that small islands of crust were first stitched together to form the stable nuclei of the continents we know today.
  • India has a similar history. Similarly, India appears to be an amalgamation of four cratons.
  • The formation of Baltica - the continent which was to become Europe -- is one of the best-known examples. Baltica formed in the Paleoproterozoic from the fusion of three cratons
  • ...1 more annotation...
  • For example, the core of South America formed around Amazonia in the Paleoproterozoic. The geologically stable core of South America is the Amazonian craton, roughly coterminous with northern and central Brazil and the inland areas of Venezuela, both Guyanas, and Suriname.
  • harukas on 26 Jan 16
     
    This website talks about the geography in the Paleoproterozoic era. There are many useful examples about the cratons or small islands connecting into a large continent. There are also explanations about the geochemistry during that time too. 
jennyw20

Jurassic Period -- Britannica School - 1 views

school.eb.co.uk/...117450

Jurassic

shared by jennyw20 on 26 Jan 16 - No Cached
  • claudiav2 on 26 Jan 16
     
    Useful for this period 
  • jennyw20 on 26 Jan 16
     
    Useful for researching Jurassic time period.
  • lauran1 on 26 Jan 16
     
    The climate is a lot like the Cretaceous period. The ocean temperatures were very similar.
aleksandera

Geologic Changes to the Very Good Earth | The Institute for Creation Research - 0 views

www.icr.org/...ologic-changes-very-good-earth

relative dating earth changes

shared by aleksandera on 26 Jan 16 - No Cached
  • aleksandera on 26 Jan 16
     
    This site explains the geological changes over time
emmab25

Introduction to the Ceratopsians - 1 views

www.ucmp.berkeley.edu/...ceratopsia.html

Cretaceous Ceratopsians fossils

shared by emmab25 on 26 Jan 16 - No Cached
  • five-ton animal the size of a car, with a giant bony frill on its head, and you've got a fairly accurate picture of a ceratopsian dinosaur such as Triceratops.
  • are found only in the Late Cretaceous of North America; they are among the last of the dinosaurs (other than the birds of course).
  • Ceratopsians were ornithischians, or "bird-hipped" dinosaurs.
  • ...7 more annotations...
  • The oldest ceratopsians appeared at the beginning of the Cretaceous, about 140 million years ago. In the Late Cretaceous, about 100 million years ago, the ceratopsians began to diversify in North America and in Asia.
  • Forms without the enormous horns and frills of Triceratops, in the family Protoceratopsidae, include the Mongolian genus Protoceratops and the unusual bipedal, frill-less dinosaur Psittacosaurus ("parrot-lizard").
  • Their "beak" and rows of grinding cheek teeth suggest that they fed on tough vegetation. The huge, heavy "frill" of ceratopsians such as Triceratops may have served as armor against the attacks of saurischian predators like Tyrannosaurus, which lived in the same time and place as Triceratops.
  • other ceratopsians had smaller frills and/or frills with large openings; such frills would have been little defense against a predator. So ceratopsian frills may also have functioned as heat radiators, or signaling devices, or to attract mates, in addition to whatever protective function they may or may not have had.
  • Recent work on the oxygen isotopes found inside the bony frill, which indicate the relative temperatures of different parts of the bone, supports the first of these hypotheses: the frills functioned as heat radiators.
  • Ceratopsians probably traveled in herds; there are "bone beds" in the western United States that contain the bones of hundreds of individuals of the same species of ceratopsian.
  • f attacked, the herd could stampede, or "circle the wagons" and fend off predators. In terms of animals living today, it may be best to think of ceratopsians — at least the larger ones — as analogues of elephants or rhinos: large herbivores in herds that relied on horns and attitude to protect themselves.
jiminp

Proterozoic Eon | geochronology | Britannica.com - 0 views

www.britannica.com/...Proterozoic-Eon

proterozoic eukaryote oxygen

shared by jiminp on 26 Jan 16 - No Cached
  • The Proterozoic Eon extended from 2.5 billion to 541 million years ago and is often divided into the Paleoproterozoic (2.5 billion to 1.6 billion years ago), the Mesoproterozoic (1.6 billion to 1 billion years ago), and the Neoproterozoic (1 billion to 541 million years ago) eras.
  • Megascopic eukaryotes first appeared about 2.3 billion years ago and became widespread by about 1.8 billion years ago.
  • Eukaryotes employed a form of respiration and oxidative metabolism; they had a central nucleus that could split into separate sex cells, and so for the first time a mixed and variable genetic code could be passed to younger generations.
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  • Many mountain belts formed during the Proterozoic
  • jiminp on 26 Jan 16
     
    Useful for the period. 
zosiaa

Cretaceous - Dinopedia - Wikia - 0 views

dinopedia.wikia.com/...Cretaceous

Cretaceous paleography

shared by zosiaa on 26 Jan 16 - No Cached
  • uring the Cretaceous, the late Paleozoic - early Mesozoic supercontinent of Pangea completed its breakup into present day continents, although their positions were substantially different at the time
  • llera
  • zosiaa on 26 Jan 16
     
    This describes the continents during the Cretaceous period.
aurciuolo

The Archean Eon and the Hadean - 0 views

www.ucmp.berkeley.edu/...archean_hadean.php

Archean

shared by aurciuolo on 26 Jan 16 - No Cached
  • Online exhibits : Geologic time scale The Archean Eon and the Hadean The Archean eon, which preceded the Proterozoic eon, spanned about 1.5 billion years and is subdivided into four eras: the Neoarche
  • aurciuolo on 26 Jan 16
     
    The Archean eon, which preceded the Proterozoic eon, spanned about 1.5 billion years and is subdivided into four eras: the Neoarchean (2.8 to 2.5 billion years ago)
amys123

Quaternary Period: Climate, Animals & Other Facts - 0 views

www.livescience.com/43151-quaternary-period.html

animals quaternary climate fossils

shared by amys123 on 26 Jan 16 - No Cached
  • The Quaternary Period is a geologic time period that encompasses the most recent 2.6 million years — including the present day. Part of the Cenozoic Era, the period is usually divided into two epochs — the Pleistocene Epoch, which lasted from approximately 2 million years ago to about 12,000 years ago, and the Holocene Epoch, which began about 12,000 years ago
  • amys123 on 26 Jan 16
     
    Information about the Quaternary period (landforms, climates, animals etc.)
emmab25

Cretaceous: Extinction of the Dinosaurs - 0 views

paleobiology.si.edu/...cretaceous4.html

Cretaceous Mass-extinction

shared by emmab25 on 26 Jan 16 - No Cached
  • About 65 million years ago the second greatest mass extinction in Earth history occurred, resulting in the loss of the dinosaurs as well as nearly 50% of all the world’s species. Though not nearly as severe as the end-Permian mass extinction, the end-Cretaceous extinction is the most famous mass extinction in Earth history
  • Terrestrial plants also suffered a major extinction at this time; in some regions up to 60% of latest Cretaceous plant species were absent in the subsequent Paleocene.
  • The causes of the end-Cretaceous extinction are still being debated by paleontologists. Researchers agree that a major factor was an asteroid about 10 kilometers in diameter that struck what is now the Yucatán peninsula in Mexico. The effects of the impact were catastrophic, probably including global forest fires, possibly a period of cold weather due to sunlight-blocking dust and smoke, and a subsequent period of hot climate caused by the high levels of CO2 released into the atmosphere by the impact.
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  • Some paleontologists argue that dinosaurs were already in decline before the asteroid impact, so that its environmental effects merely hastened their extinction.
benjamink12

Australopithecus afarensis - 0 views

humanorigins.si.edu/...australopithecus-afarensis

Neogene Australopithecusafarensis

shared by benjamink12 on 26 Jan 16 - No Cached
  • Found between 3.85 and 2.95 million years ago in Eastern Africa (Ethiopia, Kenya, Tanzania),
  • Similar to chimpanzees, Au. afarensis children grew rapidly after birth and reached adulthood earlier than modern humans. This meant Au. afarensis had a shorter period of growing up than modern humans have today, leaving them less time for parental guidance and socialization during childhood.
  • Au. afarensis had both ape and human characteristics: members of this species had apelike face proportions (a flat nose, a strongly projecting lower jaw) and braincase (with a small brain, usually less than 500 cubic centimeters -- about 1/3 the size of a modern human brain)
  • benjamink12 on 26 Jan 16
     
    All basic good information about Australopithecus afarensis
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