
	Where results make sense

Topic: Geologic eras

Related Topics

Geologic time scale

Precambrian

Caenozoic

Mesozoic

Tertiary

Miocene

Oligocene

Eocene

Coniferous

Paleocene

Pleistocene

Pliocene

Holocene

Orogeny

State Fossil

	Paleozoic - Wikipedia, the free encyclopedia
		The Paleozoic is a major division of the geologic timescale, one of four geologic eras.
		Geologically, the Paleozoic starts shortly after the breakup of a supercontinent called Rodinia and at the end of a global ice age.
		At the start of the era, life was confined to bacteria, algae, sponges and a variety of somewhat enigmatic forms known collectively as the Ediacarian fauna.
	en.wikipedia.org /wiki/Palaeozoic (455 words)

	Geologic Eras
		The Eras are the next largest interval units into which the Geologic Time is divided and represented on the chart.
		Eras encompass major intervals of Time and are defined based on the fossil life-forms found in the rock layers, and the Law of Superposition.
		However, the Mesozoic Era landscape was also occupied by insects, early mammals, plants such as conifers and ferns, fish, and finally flowering plants and early birds.
	imnh.isu.edu /geo_time/geo_time_eras.htm (249 words)

	Geologic timescale -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-19)
		The geologic timescale is used by (A specialist in geology) geologists and other scientists to describe the timing and relationships between events that have occured during the (A record or narrative description of past events) history of the (The 3rd planet from the sun; the planet on which we live) Earth.
		The geologic or "deep" time of Earth's past has been organized into various periods according to events which took place in each period.
		First (Any of numerous extinct terrestrial reptiles of the Mesozoic era) dinosaurs, (Any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk) mammals, (A bony fish of the subclass Teleostei) teleosts, and (Crocodiles; alligators; caimans; gavials) crocodylia.
	www.absoluteastronomy.com /encyclopedia/g/ge/geologic_timescale.htm (2080 words)

	AMS Glossary
		In general, two or more geologic ages constitute a geologic epoch, and geologic ages may be defined differently in different parts of the world.
		Two or more epochs are required to make up a geologic period, and, in turn, two or more periods are needed to constitute a geologic era.
		Depending on the part of the geologic time scale, increments are as long as tens of millions of years or as short as hundreds of years.
	amsglossary.allenpress.com /glossary/browse?s=g&p=10 (522 words)

	Geology Driving Tour
		In this era, weathering and erosion continue to shape the landscape.
		Geologic time lines are expressed in geologic eras and periods.
		During the Paleozoic Era, this area was a basin covered by a shallow sea that, over millions of years, deposited a thick blanket of sediments over the Precambrian igneous and metamorphic rocks.
	www.nps.gov /wica/Geology_Driving_Tour.htm (1095 words)

	Geologic Time
		The Geologic Timescale was initially built from many observations of rock sequences from many parts of the world; no single locality contains the entire geologic time sequence, and correlation of geologic units across different localities allowed geologists to construct a composite timescale.
		The different Eras are marked by major life extinctions in the fossil records, including the famous demise of the dinosaurs at the Mesozoic-Cenozoic boundary, as well as an even larger extinction of marine life at the Paleozoic-Mesozoic boundary.
		Geologists immediately started determining the ages of volcanic rock layers that were interbedded with the fossil-containing sedimentary rocks that were used to determine the first geologic timescale, adding absolute ages to the geologic eras and periods.
	www.geology.wisc.edu /homepages/g100s2/public_html/geologic_time.htm (686 words)

	Fossils
		The geologic range of a fossil species is defined as the interval between its first occurrence and last occurrence in the geologic record.
		The geologic range of a species is determined by recording the occurrence of the fossils in numerous stratigraphic sequences from hundreds of locations.
		You have to establish the geologic range of the fossil, correlate it from place to place, and then you have to find a locality where there is a datable bed stratigraphically at or near the first appearance of the fossil, and a datable bed stratigraphically at or near the last appearance of the fossil.
	www.gpc.edu /~pgore/Earth&Space/GPS/fossils.html (4066 words)

	Geologic Time Scale
		The modern geologic time scale shown in Figure A1 was nearly complete by the end of the 19th century and was based on stratigraphic and fossil studies in northern Europe and the United States.
		Originally, geologic time scale divisions were based on the natural breaks in the stratigraphic column.
		Thus, the Paleozoic Era refers to ‘‘ancient life,’’ the Mesozoic Era to ‘‘medieval life’’ and the Cenozoic Era to ‘‘modern life.’’ Rocks older than Paleozoic generally lack diagnostic fossils and are widely known as belonging to the Precambrian Era.
	southwest.library.arizona.edu /azso/back.1_div.1.html (1090 words)

	The Geologic Time Scale
		In order to simplify the huge amount of geological information, geologists have broken Earth's history down into sections which are called geological eras, periods, and epochs.
		An era of geologic time from the beginning of the Tertiary period to the present.
		An era of geologic time, from the end of the Precambrian to the beginning of the Mesozoic.
	scienceviews.com /dinosaurs/geologictime.html (717 words)

	Portable Planetariums Home (Site not responding. Last check: 2007-10-19)
		The Ordovician period was an era of extensive diversification and expansion of numerous marine clades.
		The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 439 million years ago (mega years ago, mya), to the beginning of the Devonian period, about 408.5 mya.
		As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by 5-10 million years.
	www.planetarios.com /paleozoico.htm (7117 words)

	Virtual Silurian Reef -- Geologic Time (Site not responding. Last check: 2007-10-19)
		The Paleozoic Era, a term that means "old animal life," is characterized by extinct animal groups such as trilobites.
		The Mesozoic Era, which means "middle animal life," is characterized by a different assemblage of fossils, including ammonites and dinosaurs.
		The Cenozoic Era, which means "modern animal life," is dominated by fossils of animal groups that still survive, such as mammals.
	www.mpm.edu /reef/geoltime.html (224 words)

	Geologic Periods
		The Geologic Eras are large interval units of time that encompass smaller intervals of time called Periods.
		Each of the three Eras of the Phanerozoic Eon are comprised of several Periods that are each subject to the Law of Superposition and the Law of Faunal Succession.
		The Cenozoic Era is comprised of two Periods derived from an earlier 1900's Geologic Time Chart that separated the rock layers into a fourfold division named Primary, Secondary, Tertiary, and Quaternary.
	imnh.isu.edu /geo_time/geo_time_periods.htm (606 words)

	Geology Entrance
		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)

	Golden Gate Photo - Glossary of Technical Terms
		The third of the four Geologic Eras in which geologic time is divided.
		The second of the four Geologic Eras in which geologic time is divided.
		The Paleozoic Era is subdivided into the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian periods.
	www.goldengatephoto.com /glossary2.html (2234 words)

	era -- Encyclopædia Britannica
		The major divisions of the era, from oldest to youngest, are the Triassic, Jurassic, and Cretaceous periods.
		It was the interval of time during which the continents assumed their modern configuration and geographic positions and during which the Earth's flora and fauna evolved toward those of the present.
		The major divisions of the Paleozoic Era, from oldest to youngest, are the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian periods.
	www.britannica.com /eb/article-9032855 (895 words)

	Search Results for Mesozoic - Encyclopædia Britannica
		The Mesozoic Era (245 to 66.4 million years ago) is divided into three periods—the Triassic, Jurassic, and Cretaceous—and is remarkable for the transgression of ancient seas and for the emergence of...
		The events in Asia of the Mesozoic (248 to 65 million years ago) may be summarized as follows: events in the Tethysides, events in the Altaids, events in the continental nuclei, and events in the...
		During the Mesozoic era a new ocean, the Tethys, evolved in what is now southern Europe, and during the Cenozoic era this ocean was destroyed by subduction, with the result that many small plates...
	www.britannica.com /search?query=Mesozoic&submit=Find&source=MWTAB (498 words)

	Geologic Time Scale II
		To access what the students recall from the previous year’s activity, as well as any other knowledge they may have about the Geologic Time Scale, the students will be given the Geology Questionnaire.
		After the questionnaire has been given and discussed, the students will be introduced to the periods within the eras in the geologic time scale.
		Instead of using a time line to show the eras, the students could us a clock to show the eras and periods.
	www.geology.wisc.edu /~museum/hughes/GeoTimeScale2.html (867 words)

	"Summary of Tenn. Geologic History "
		Based on the duration of some of the gaps in Tennessee's rock record, it is safe to assume that major erosional episodes removed huge volumes of rock and left behind major unconformities.
		Eras are the 2nd largest subdivision of geologic time; the largest is the Eon.
		Rocks in Tennessee from these three eras are predominately sedimentary in origin, and constitute most of the rock exposed at the surface in the state.
	www.mtsu.edu /~cdharris/GEOL100/TN-geology/tn-geol2.htm (1826 words)

	Earth Floor: Geologic Time
		This is the last of three geologic eras squeezed into the Phanerozoic ("Evident Life") Eon that covers the last 10% of Earth's whole geologic history.
		This is the "Age of Mammals" in which whales took over the oceans, saber-tooth cats shared the land with elephants and giant sloths, and humans finally appeared.
		In the last 10,000 years, a blink of the eye in geologic time, humanity has spread across the lands and seas of Earth, altering the face of Earth with cities and farms, destroying some plants and animals and domesticating others.
	www.cotf.edu /ete/modules/msese/earthsysflr/cenozoic.html (490 words)

	A Visit to the ICR: Part 5
		Unlike old-earth creationists and theistic evolutionists, who accept radiometric dating, the fossil record, and immense periods of geologic time, young-earth creationists are forced to explain the geologic features of earth almost exclusively as products of a global flood.
		This is one of the unrecognized difficulties of flood geology.
		Banded iron formations are not found in all geologic eras, but occur sparingly in the Archean, and 92% of them occur in the interval from 2.5 to 2.0 billion years ago.
	www.talkorigins.org /faqs/icr-visit/bartelt4.html (2072 words)

	B.C. (comic) - Wikipedia, the free encyclopedia
		It is set in prehistoric times, featuring a group of cavemen and anthropomorphic animals from a variety of geologic eras.
		It is one of the longest-running strips done by its original creator, having appeared daily in newspapers since February 17, 1958.
		Originally, the strip's setting was very firmly set in prehistoric times, with the characters clearly living in an era untouched by modernity.
	en.wikipedia.org /wiki/B.C._(comic) (691 words)

	Handprint : Geoevolution
		The Carboniferous era saw the first amphibians and the climax of large ancient fern forests, which built up over millions of years the coal and petrochemical deposits that fueled the Twentieth Century.
		During the Permian era the newly assembled supercontinent of Pangaea ("All Earth") lay across the equator stretching almost from pole to pole.
		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)

	Eras Geologic (Site not responding. Last check: 2007-10-19)
		The state's rocks constitute one of the most complete and informative geologic records of any part of North America...
		Le periodos geologic o epochas son generalmente fixate con alicun distinct eventos como, per exemplo, extinction in massa.
		Report on the ground truth geologic data gathering in Nueva Era, Ilocos Norte and vicinity, for the Landsat imagery inte...
	interlingua.encyclopedia.st /Eras_Geologic (344 words)

	Evolution (Site not responding. Last check: 2007-10-19)
		Identify selected fossils from the Paleozoic, Mesozoic and Cenozoic eras and utilizing this information, infer the type of environment under which they were living.
		Using any resources available to you, find a geological history chart that includes the eras, periods, and if possible the dominant life forms for the periods.
		Repeat this process until you have examined the fossils of the three geologic eras.
	www.pc.cc.va.us /biology-labmanual/lab11evol/evolution.htm (659 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.
		University of California's Museum of Paleontology Web Lift for Geologic Time.
	www.enchantedlearning.com /subjects/Geologictime.html (592 words)

	How Plants and Animals Have Changed Through the Geologic Eras
		The geologic record gives us a fascinating glimpse into the history of the earth and the forms of life that have lived on it.
		Second, geologic strata lie on top of one another, and the layers indicate relative age — the bottom layers are much older than layers near the top.
		Throughout the geologic record, and continuing even today, algae are still depositing limestone in a manner similar to that found in the earliest rock strata in the bottom of the Grand Canyon.
	www.wcg.org /lit/booklets/science/burky3.htm (3608 words)

	Objectives for Exam #4 (Site not responding. Last check: 2007-10-19)
		Given a geologic cross-section, use the rules of relative age dating to put geologic events in their proper time sequence.
		Place the geologic eras (Precambrian, Paleozoic, Mesozoic, Cenozoic) in proper time sequence; memorize the age of the boundaries between these eras.
		Place the following descriptions in the proper geologic eras: The age of amphibians, that age of reptiles, the age of mammals, human development (See figure 11.5 for this).
	www.csus.edu /indiv/e/evansd/geology8/Objectives_Exam4_F01.htm (1035 words)

	Mesozoic Era -- Encyclopædia Britannica
		The Mesozoic Era (245 to 66.4 million years ago) is divided into three periods—the Triassic, Jurassic, and Cretaceous—and is remarkable for the transgression of ancient seas and for the emergence of massive land formations containing interesting fossil remains.
		During the Mesozoic era a new ocean, the Tethys, evolved in what is now southern Europe, and during the Cenozoic era this ocean was destroyed by subduction, with the result that many small plates collided.
		Often considered the earliest of the plant-eating mammals, they bore a superficial resemblance to today's rodents, and that is how they got their nickname of rodents of the Mesozoic.
	www.britannica.com /eb/article-9117448?tocId=9117448 (835 words)

	ESCI 308 review guides (Site not responding. Last check: 2007-10-19)
		Describe what types of rocks (and their ages, on the scale of geologic eras) are exposed in each park.
		Recognize which park is which from photographs (of the surface of the park and of the caves), geologic maps, geologic cross-sections and geologic columns.
		Explain why the geologic processes that lead to the formation of arkose or arkosic conglomerates versus the formation of a well-sorted quartz sandstone.
	www.neiu.edu /~kbartels/308handouts.html (1732 words)

Try your search on: Qwika (all wikis)