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Topic: Geologic periods

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In the News (Wed 16 Jan 19)

 List of time periods - Wikipedia, the free encyclopedia
The geologic timescale covers the extent of the existence of Earth, from about 4600 million years ago to the present day.
These names differ across different countries; in particular, the division of the Carboniferous period into Mississippian and Pennsylvanian is purely a North American distinction.
Periodization for a discussion of the tendency to try to fit history into non-overlapping periods.
en.wikipedia.org /wiki/List_of_time_periods   (328 words)

 Geologic Periods
Life-forms in the Triassic Period were arthropods, turtles, crocodilians, true lizard, bony fishes, sea urchins, early dinosaurs, marine reptiles, and the therapsids, the first mammal-like reptiles appear.
Life-forms in the Jurassic Period were flying reptiles, dinosaurs, earwigs, conifers, redwood, cypress, yew, cycads, ginkgoes, and the early mammalian dicynodonts.
The Cretaceous Period was the final Period of the Mesozoic Era and extended from 144 Million to 65 Million Years Ago.
imnh.isu.edu /geo_time/geo_time_periods.htm   (606 words)

 List of time periods - Encyclopedia.WorldSearch   (Site not responding. Last check: 2007-11-07)
The planters of the commonwealth;: A study of the emigrants and emigration in colonial times: to which are added lists of passengers to Boston and to the...
Illustrated history of the United States mint with a complete description of American coinage,: From the earliest period to the present time.
The judicial chronicle: Being a list of the judges of the courts of common law and Chancery in England and America, and of the contemporary reports, from...
encyclopedia.worldsearch.com /list_of_time_periods.htm   (557 words)

 Fathoming Geologic Time
Geologic time is divided into units based on major geological and biological events, such as mountain building phases ('orogeny' in Geo-speak) or mass extinctions (relatively brief periods during which several - sometimes many - lineages die out).
The Cenozoic is popularly known as The Age of Mammals*, as this is the period during which we fabulous fur-balls appeared and thus in which we have the greatest self-interest.
A handy mnemonic for recalling the sequence of geologic periods and epochs - from oldest to youngest - is, "Camels often sit down carefully.
www.elasmo-research.org /education/evolution/geologic_time.htm   (1252 words)

 Articles - Geologic time scale   (Site not responding. Last check: 2007-11-07)
The geologic time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of the Earth.
The table of geologic periods presented here is in accordance with the dates and nomenclature proposed by the International Commission on Stratigraphy, and uses the standard color codes of the United States Geologic Survey.
For example, the boundary between the Cretaceous period and the Palaeogene period is defined by the extinction event that marked the demise of the dinosaurs and of many marine species.
lastring.com /articles/Geologic_time_scale?...   (1758 words)

 Hands On Earth Science No. 07, Modeling Ohio's Geology   (Site not responding. Last check: 2007-11-07)
Geologic maps are representations of the geology of an area.
For example, the geologic map of Ohio shows the distribution of bedrock belonging to six geologic systems, that is, rock laid down during corresponding geologic time periods.
Geologic maps generally are colorful, and commonly are accompanied by cross sections that help in their interpretation.
www.dnr.state.oh.us /geosurvey/edu/hands07.htm   (647 words)

 RRT Pg3 text & Pg4 map   (Site not responding. Last check: 2007-11-07)
A second type of standard geologic diagram is the stratigraphic column, which shows the sedimentary rocks present in an area as if they were stacked on top of each other like a layer cake.
A third standard geologic diagram is a cross section, which views the earth as if it were cut open and seen from the side.
Geologic cross sections are interpretative, since the relations can generally not be observed directly.
imnh.isu.edu /digitalatlas/geog/rrt/part2/4.htm   (285 words)

 [No title]   (Site not responding. Last check: 2007-11-07)
See periodization for a discussion of the tendency to try to fit history into non-overlapping periods.
A short first period is measured in tiny fractions of seconds, but thereafter most things happen on the scale of billion years.
It is used to consider events noticeable on a universal scale, such as the formation of matter, stars, and galaxies.
www.askmytutor.co.uk /l/li/list_of_time_periods.html   (424 words)

 - The Geologic Column: Does It Exist? -   (Site not responding. Last check: 2007-11-07)
Periodically, we also hear the claim that ‘missing’ geologic periods are expected because the earth was never ‘depositional’ everywhere at the same time.
Firstly, the presence or absence of all ten periods is not the issue, because the thickness of the sediment pile, even in those locations, is only a small fraction (8–16% or less) of the total thickness of the hypothetical geologic column.
Clearly, if the periods in these locations were assigned by assuming that the geological column was real, then it is circular reasoning to use the assigned ten periods to argue the reality of the column.
www.trueorigin.org /geocolumn.htm   (4565 words)

 Earth Floor: Geologic Time
The age of the rock in years can be found by measuring the rate at which a parent element decays and then measuring the ratio of parent element to daughter element in the rock.
The ages in years of the different geological time periods are found by measuring the absolute ages of many rocks from all of the different periods.
The absolute ages of rocks taken from the different time periods have shown that the time periods were of greatly differing lengths.
www.cotf.edu /ete/modules/msese/earthsysflr/ages.html   (465 words)

 My Geologic Time Period -- RJ   (Site not responding. Last check: 2007-11-07)
An interactive geologic map and associated geologic column that allow the user to explore the paleontology of any state during any time period.
Navigate to a particular geologic period for the author's illustrations that represent his interpretation of life during that particular period.
Another time chart from which to link to a paricular geologic period for information on meteoric impacts, significant events, and graphics of both fossils and lifeforms for you geologic period.
pinetlibrary.com /classpage.php?page_id=666   (585 words)

 Handprint : Geoevolution
The continental events of the period covered here form three very large scale episodes: [1] the break up of the ancient south polar supercontinent of Rodinia, [2] the reassembly of Rodinian fragments (Gondwana and Laurasia) into the pole-to-pole supercontinent of Pangaea, and [3] the fragmentation and reassembly of Pangaea into the continental pattern of today.
These geologic transformations are illustrated in hemispheric views approximately centered on the North American and northern European (Baltic) continental blocks.
During the Jurassic era, as the Cimmerian blocks collided with the Siberian extension of Pangaea in the northeast, the various components of the supercontinent began to shift and rotate.
www.handprint.com /PS/GEO/geoevo.html   (3279 words)

 Fossil Collections, Specimens, Amber, Triops and more.
A geologic time chart on the inside of the box lid shows the geologic time during which the various fossils were living, active creatures.
Geologic Time Chart - The same 11" x 17" geologic time chart that we include with 0090-03A, C200S, 1602-000 and 1610-000 except that it is printed in color, framed in solid oak and has 17 fossil specimens mounted on it to demonstrate examples of different geologic periods.
This is an excellent example of a Cretaceous Period gastropod from Texas.
www.rocksandminerals.com /fossil/fossil.htm   (1599 words)

 Journal of Geoscience Education: Combining a historical geology project with a campus student organization's ...   (Site not responding. Last check: 2007-11-07)
Typical assignments relating to the geologic time scale include asking students to scale geologic time to something more familiar to them such as their age, the distance between two cities, even the length of a song.
Students may be shown visual models to compare to the age of the Earth and significant geologic events, such as spacing the timescale to the length of a classroom, or by comparing the occurrence of events in geologic time to the length of clothesline held across the classroom (Richardson, 2000).
Students were told that on the day of the project they would stand along their section of geologic time and discuss with other members of the campus and local community what happened during their segment or discuss the geologic history of their organism.
www.findarticles.com /p/articles/mi_qa4089/is_200309/ai_n9281596   (1360 words)

 How Good are those Young-Earth Arguments: Geologic Column
Some of the geologic periods may be missing, either because they were never laid down at that location or because they have since eroded away.
In the geologic column (American version), the Pennsylvanian Period is the sixth period in the Paleozoic era and is characterized in many places by great coal-, oil-, and gas-bearing deposits.
The question as to whether some locality has all the periods in the geologic column is only of academic interest; it has no bearing on the fitness of the concept.
www.talkorigins.org /faqs/hovind/howgood-gc.html   (7911 words)

 Untitled Document
Understanding the immensity of geologic time is important because many geologic processes and evolutionary events are so gradual that vast quantities of time are required to effect perceivable changes.
The four great Eons of geologic time, from oldest to youngest are the Hadean (4.6 - 3.8 billion years ago), the Archean (3.8 - 2.5 billion years ago), the Proterozoic (2.5 - 0.57 billion years ago), and the Phanerozoic (0.57 billion years ago - present).
All geologic time prior to the Phanerozoic is often refered to as the "Precambrian." The diagram in the following link shows the Geologic Time Scale.
www.depauw.edu /acad/geosciences/fsoster/GeoTime.htm   (1181 words)

 Geologic Time - Enchanted Learning Software
The first geologic time scale was proposed in 1913 by the British geologist Arthur Holmes (1890 - 1965).
This was soon after the discovery of radioactivity, and using it, Holmes estimated that the Earth was about 4 billion years old - this was much greater than previously believed.
Triassic period ends with a minor extinction 213 mya (35% of all animal families die out, including labyrinthodont amphibians, conodonts, and all marine reptiles except ichthyosaurs).
www.enchantedlearning.com /subjects/Geologictime.html   (592 words)

 Table of Geological Periods
The known geological history of Earth since the Precambrian Time is subdivided into three eras, each of which includes a number of periods.
This period is the first new one added in 120 years.
The U.S. Geological Survey divides the Cenezoic Era into the Tertiary Period (with the Paleocene, Eocene, Oligocene, Miocene, and Pliocene Epochs) and the Quaternary Period (with the Pleistocene and Holocene Epochs).
www.infoplease.com /ipa/A0001822.html   (532 words)

 Untitled Document   (Site not responding. Last check: 2007-11-07)
If you gave different geologic periods for the ages of #1 and #2, then you should have answered NO to both of these questions.
If they formed in different geologic periods then they are neither the same age nor equivalent in time.
The table of the geologic periods in the text (p.
www.colorado.edu /geolsci/courses/GEOL1020/home3.html   (712 words)

 Exploring Geologic Time   (Site not responding. Last check: 2007-11-07)
Clickable Geologic Time Scale - A clickable time scale offering breif information on each span of time on the scale.
Geologic Time Scale - Offers a clickable time scale that give information on life during specific spans of time.
Take our Web Geological Time Machine - Has a clickable time scale with indepth information on the different eras and eons.
www.kn.pacbell.com /wired/fil/pages/listgeologicms.html   (127 words)

 GLY 110 Lecture 4   (Site not responding. Last check: 2007-11-07)
Georges Cuvier (1769-1832) like, William Smith, recognized that the geologic record contained unique groups of animals that lived for a while, then disappeared (became extinct) and were replaced by new groups of animals.
Actualism states that the geologic record is the product of both NATURAL catastrophes (like local floods, earthquakes, meteorite impacts, and hurricanes) and slow and gradual processes (such as lakes drying up over long periods of time and precipitating salt deposits).
By the early 1840’s, the geologic time scale looked much like it does today, except that all of the geologic periods were relative.
www.uky.edu /ArtsSciences/Geology/henke/110/kh110lec4.html   (2439 words)

 Geologic Time Scale   (Site not responding. Last check: 2007-11-07)
efore modern radiometric dating techniques made it is possible to determine rock ages empirically, the geologic record was divided into relative time units based on correlation of the rock formations, mostly by the index fossils they contained.
This was the basis for the modern Geologic Time Scale, a concoction of names like Cretaceous, Jurassic, and Ordovician, assigned by early European geologists.
This is accomplished by measuring the amounts of certain radioactive isotopes contained in the rocks (usually limited to igneous rocks), in relation to the amount of corresponding decay isotopes (daughter products) that are present.
www.clearlight.com /~mhieb/WVFossils/GeolTimeScale.html   (147 words)

 Geologic Time - Part of Kuban's Paleo Place   (Site not responding. Last check: 2007-11-07)
Geologic Time Scale by GSA - Detailed Geologic Time Scale by the Geologic Society of America.
Geologic Time Scale - This chart is upside down (shows older dates at top, opposite real geologic column), but includes summaries of the dominant life forms in each period.
Geologic Time Scale - Imagemap derived primarily from the Geologic Time Scale of W.H. Harland, et al.
paleo.cc /kpaleo/paletime.htm   (314 words)

 Geology Entrance   (Site not responding. Last check: 2007-11-07)
Exploring this series of exhibits will take you on a journey through the history of the Earth, with stops at particular points in time to examine the fossil record and stratigraphy.
The Geology Wing is organized according to the geologic time scale.
You might wish to start in the Cenozoic Era (65 million years ago to the present) and work back through time, or start with Hadean time (4.5 to 3.8 billion years ago) and journey forward to the present day.
www.ucmp.berkeley.edu /exhibit/geology.html   (198 words)

Your crazy science teacher created a time machine that allows you to travel back to any geologic period beginning 4.5billon years ago to the present.
Click on one of the geologic period links located on the left hand side of the web page.
3 to 5 sentences to summarize the climate conditions present during this period.
www.csus.edu /indiv/p/peachj/webquest/232_fall_2003/tozzi/climates.htm   (262 words)

 AllRefer.com - Quaternary period (Geology And Oceanography) - Encyclopedia
Quaternary period[kwutUr´nurE] Pronunciation Key, younger of the two geologic periods of the Cenozoic era of geologic time (see Geologic Timescale, table) from 2 millon years ago to the present.
Comprising all geologic time from the end of the Tertiary period to the present, it is divided into the Pleistocene and Holocene, or Recent, epochs.
It was named (1759) by Giovanni Arduino, an Italian scientist who thought that the biblical great flood was responsible for its deposits.
reference.allrefer.com /encyclopedia/Q/Quaterna.html   (291 words)

 Thirteen Ed Online - Evolution
Have students look at a geologic timeline to see how it relates to the appearance and evolution of different forms of life on Earth.
Show each geologic period, the organisms that appeared in it, and how each organism fits into the evolutionary story.
Students can bring along their geologic time-scale flow charts, compare them to what is on display, and see examples of what they have been learning about.
www.thirteen.org /edonline/lessons/evolution/b.html   (1006 words)

 Lesson Plans - The Evolution of Dinosaurs Over Geologic Time   (Site not responding. Last check: 2007-11-07)
This lesson asks them to combine their knowledge of evolution, geologic time, and dinosaurs into a discussion of how these three topics overlap with regard to dinosaur evolution in the Cretaceous period.
Review students' understanding of geologic time by having them go to the Geological Time Machine and look through the different time periods.
Ask students to compare the dinosaur species that were present during the Triassic, Jurassic, and Cretaceous periods and explain the ways in which geological and climatic changes on Earth may have contributed to the development of these species.
www.nationalgeographic.com /xpeditions/lessons/17/g912/serenoevol.html   (617 words)

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