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Topic: Geologic ages

Related Topics

Geologic timescale

List of time periods

Jurassic

Timeline of geology

Holocene

Earth

Dinosaur

Crust

White Sands National Monument

List of minerals

Geologic timescale

	Geologic time scale - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-06)
		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 over 100 years, the age of the Earth and of the rock strata was the subject of considerable debate until advances in the latter part of the 20th century allowed radioactive dating to provide relatively firm dates to geologic horizons.
	en.wikipedia.org /wiki/Geologic_age (1763 words)

	Brown, R. H. --- How Solid is a Radioisotope Age of a Rock?
		It is reasonable to expect that a radioisotope age for a mineral formation should specify the length of time that formation has been in existence, and also the minimum age of any fossils that may be associated with it.
		Lack of chemical isolation generally (but not always) has been expected to produce radioisotope ages that are most likely to be younger than the correct real time age, particularly when the daughter isotope is highly mobile, as is the case for the inert gas (argon) produced by the radioactive decay of potassium.
		Radioisotope ages that are older than allowable on the basis of stratigraphic or biological control are explained as due to retention of daughter isotopes from a state in which the mineral components existed previous to the association in which they are now found.
	www.grisda.org /origins/10093.htm (1017 words)

	A Visit to the ICR: Part 4
		The geologic columns of Utah are rich in Mesozoic strata and dinosaur fossils, unlike the state of Illinois (where I reside), which has neither Mesozoic age rocks nor dinosaur fossils in most of its local columns.
		The 'ages' given to the periods of the geologic column have been assembled from a variety of data, including index fossils, magnetic reversals, and radiometric dating of rocks.
		Ages of rocks are sometimes estimated on the basis of the fossils they contain, but this estimate can and should be substantiated by other methods such as radiometric dating.
	www.talkorigins.org /faqs/icr-visit/bartelt3.html (1225 words)

	The Gap Theory (Site not responding. Last check: 2007-11-06)
		The geologic ages cannot be disposed of merely by ignoring the extensive fossil record on which they are based, which is what the theory tries to do.
		These supposed ages are inextricably involved in the entire structure of the evolutionary history of the earth and its inhabitants, up to and including man. The fossil record is the best evidence for evolution (in fact, the only such evidence which indicates evolution on more than a trivial scale).
		Furthermore, the geologic ages are recognized and identified specifically by the fossil contents of the sedimentary rocks in the earth’s crust.
	www.csinfo.org /gap_theory.htm (1074 words)

	CT DEP: Geologic Ages Represented in Connecticut Rocks (Site not responding. Last check: 2007-11-06)
		Letter represents the geologic age and is the first portion of the bedrock unit code
		Jurassic age rocks are the youngest rocks in Connecticut
		Proterozoic 'Y' age rocks are the oldest in Connecticut (~ 1100 mya)
	dep.state.ct.us /gis/dataguides/dep/layers/support/bedrock/geolage.htm (53 words)

	Information Bridge: DOE Scientific and Technical Information
		Geologic ages and accumulation rates, estimated from regressions, were used to evaluate measured ages and interpreted stratigraphic and structural relations of basalt and sediment in the unsaturated zone and the Snake River Plain aquifer at the Idaho National Engineering Laboratory (INEL) in eastern Idaho.
		Geologic ages and accumulation rates were estimated from standard linear regressions of 21 mean potassium-argon (K-Ar) ages, selected mean paleomagnetic ages, and cumulative depths of a composite stratigraphic section composed of complete intervals of basalt and sediment that were deposited in areas of past maximum subsidence.
		Estimated geologic ages range from about 200 thousand to 1.8 million years before present and are reasonable approximations for the interval of basalt and sediment above the effective base of the aquifer, based on reported uncertainties of corresponding measured ages.
	www.osti.gov /bridge/product.biblio.jsp?osti_id=481885 (477 words)

	GLY2010 (Site not responding. Last check: 2007-11-06)
		Second, the age of the Permo-Carboniferous boundary is relatively well constrained, and the nomenclature and stratigraphic position of the stage boundaries for the Early Permian are generally agreed upon.
		The age determination for their time scale is based on the distribution of "tie points"- rock samples with a combination of isotopic ages and fossils that can be used to correlate the stratigraphy.
		All of their ages within the Permian are interpolated from one weak tie point at the Permian/Triassic boundary, and two "pseudo tie points" in the mid Artinskian and at the Permo-Carboniferous boundary.
	www.clas.ufl.edu /users/emartin/GLY507599/sample.html (3922 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		The upper-case letters refer to the general geologic ages of the units (Q=Quaternary, T=Tertiary).
		RELATIVE AGE: Age of the geologic units as identified on the standard geologic time scale.
		ABSOLUTE AGE: Ranges or values for approximate ages of geologic units as determined from fossil ages, amino-acid racemization ages, and (or) radiocarbon ages.
	geology.er.usgs.gov /eespteam/sergp/database.txt (457 words)

	Geologic Time: Radiometric Time Scale
		Although Boltwood's ages have since been revised, they did show correctly that the duration of geologic time would be measured in terms of hundreds-to-thousands of millions of years.
		Potassium is found in most rock-forming minerals, the half-life of its radioactive isotope potassium-40 is such that measurable quantities of argon (daughter) have accumulated in potassium-bearing minerals of nearly all ages, and the amounts of potassium and argon isotopes can be measured accurately, even in very small quantities.
		The radiocarbon clock has become an extremely useful and efficient tool in dating the important episodes in the recent prehistory and history of man, but because of the relatively short half-life of carbon-14, the clock can be used for dating events that have taken place only within the past 50,000 years.
	pubs.usgs.gov /gip/geotime/radiometric.html (1295 words)

	Problems for the Geologic Column.
		The geologic column does not simply refer to the fact that rocks are found in the Earth in layers, but it mainly refers to the classification of rocks and fossils based on index fossils and the theoretical division of these layers into "ages".
		The use of these geological ages is so pervasive that it makes a an independent determination of fossil distribution and back checking the validity of the geologic column practically impossible.
		This one is fairly complete in that all "geologic period" are present but it in no way qualifies as a complete column, since there are numerous gaps when the strata are spread out on the geologic column chart.
	genesismission.4t.com /Geology/pgc.html (2338 words)

	OF-99-386: Development of a Digital Surface and Subsurface Geologic Map Database of Charleston County, SC
		The goal of the project is to develop a comprehensive large-scale, digital geologic dataset of surface and near-surface geology and a smaller scale subsurface geologic coverage for the Charleston county region.
		Because the utility of having geologic data in a digital format is the ability to view, query, and analyze the data, a database was developed separately and included a variety of qualitative information that might be useful to data users.
		Geologic formations are recognized at different depths throughout the core by analyzing the available data.
	pubs.usgs.gov /of/1999/of99-386/chirico.html (2594 words)

	GEOS110 Study Guide Chapter 15 (text only) (Site not responding. Last check: 2007-11-06)
		Explain how strike and dip are used to define the position of a geologic unit relative to N and to the imaginary surface we call “horizontal.” Generate an example of the orientation of a plane in space using a strike and dip symbol.
		The geologic ages of the bedrock units are provided in the legend.
		Determine the geologic ages (eras are fine) of the bedrock units underlying the following regions: a) crystalline area (granite and schist), b) limestone plateau, and c) Dakota sandstone (= Inyan Kara Group) hogback.
	www.lhup.edu /jway/110/110sg.15txt.htm (580 words)

	USGS GEOLOGIC NAMES DATABASE - HELP ON GEOLOGIC AGES (Site not responding. Last check: 2007-11-06)
		Age divisions are represented by "check" or "selection" boxes.
		If you select an era or period, all ages are assumed and enabled for the entire era or period.
		Related ages are automatically enabled or disabled as the user selects desired ages.
	ngmdb.usgs.gov /Geolex/Help/kwd_age.html (286 words)

	"The Antiquity of Man and the Geologic Ages" by Charles J. Ryan
		When we compare various modern scientific estimates of the duration of the geological eras since the first undisputed traces of life in the rocks, we are impressed by serious differences of opinion.
		The geological processes are not fully understood, and enormous gaps occur in the record.
		The exact duration of the rounds or the root-races has never been given out; and the geologists are not inclined to commit themselves definitely in regard to the length of their eras and periods.
	www.theosophy-nw.org /theosnw/cycles/cy-ryan.htm (2373 words)

	Biblical Evidences VS Compromise ~ Interpreting the Geologic Column ~ Mark Mayberry
		Evolutionists use circular reasoning when discussing the geologic column and the age of the various rock layers: They date the rocks by the fossils, and the fossils by the rocks.
		Although Dott believes that the geological record is almost exclusively a record of catastrophe rather than uniformity, he deliberately chose the word "episodic" rather than "catastrophic" to describe his views.
		The fossiliferous geological formations of the earth's crust are not a record of the evolution of life over many geological ages, but of the cataclysmic worldwide destruction of life in one age.
	www.watchmanmag.com /0204/020422.htm (4259 words)

	How Good are those Young-Earth Arguments: Geologic Column
		The principle of faunal succession in the geologic record was established by direct observation as early as 1799 by William Smith.
		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 geologic column has no missing strata because it is a catalog of all known strata; it is not a physical locality but a chronological compilation of all localities, an ideal reference frame.
	www.talkorigins.org /faqs/hovind/howgood-gc.html (7911 words)

	Dating Fossils: Geology; errors and assumptions
		Geologic ages are assigned to index fossils based upon the oft accepted Geologic Column.
		The Geologic Column is a 10 or 11 layered column that supposedly was formed over millions to billions of years by accumulation of star dust, and the death of animals and plants.
		Because of the difficulty with a Uniformitarian explanation of the geologic column [i.e.
	www.eadshome.com /Fossils.htm (1103 words)

	Pennsylvania Geological Survey: Metadata for Digital Bedrock Geology
		The geologic units depicted on the published map are, in many cases, taken from source
		geologic characteristics such as rock type, color, and texture, and are mappable at the scale
		AGE: The age of the geologic unit as shown on the 1980 state geologic map (Berg and
	www.dcnr.state.pa.us /topogeo/map1/pagmeta.aspx (4543 words)

	- The Geologic Column: Does It Exist? - (Site not responding. Last check: 2007-11-06)
		However, the average thickness of each local geologic column is about one mile (in some places, the column has essentially zero thickness, in a few places it may be up to 16 or so miles [25 km], but the worldwide average is about one mile [1.6 km]).
		Nowhere in the 19th century geologic literature, at least to my knowledge, is there a hint of a claim that an eventual find of ten superposed systems is a necessary phenomenon for validating the (presumed) reality of the geologic-age system.
		Thus, having used the geologic column to determine the geographic regions of non-deposition, the uniformitarians then complete the circle of reasoning by arguing that non-deposition accredits the 99%-incomplete geologic column.
	www.trueorigin.org /geocolumn.htm (4565 words)

	Geology 100 Lecture 15
		It is the time frame geologists use to describe the ages of geologic features (rocks, structures, or landforms).
		Relative Age: The age of a feature with respect to another feature.
		Correlation is the process of determining the age relationship between rocks at one location and rocks at another.
	ijolite.geology.uiuc.edu /01FallClass/geo100/Lectures/SM_lecture15.html (842 words)

	Geology
		The words “the same intensity” are important, as the idea that geologic changes in the past have occurred at more or less the same average speed as they happen today become the basis for the very long geological ages.
		Getting evolution and the long ages to go together in the details reminds me of a shoe salesmen trying to jam a woman’s foot into a shoe that is three sizes too small and convince her that it will fit just right after she gets it broken in.
		However, to square their idea of the age of the earth to the amount of sediments which have piled up, old age geologists have been forced into the position that the farther back one goes the slower the rate of deposition.
	www.creationism.org /heinze/HeinzeGeology.htm (17411 words)

	TIMELINE COSMIC HISTORY page of ULTIMATE SCIENCE FICTION WEB GUIDE
		Geological studies have long indicated that the amount of oxygen in the atmosphere increased dramatically two billion years ago.
		Jay Cross' attempt at all-embracing chronology 71,300,000-65,000,000 BC: Danian Age of Paleocene Epoch of Paleogene Subperiod of Tertiary Period of Cenozoic Era The DOL Geologic Ages of Earth History 65,000,000-60,500,000 BC: Thanetian Age of Paleocene Epoch of Paleogene Subperiod of Tertiary Period of Cenozoic Era The DOL Geologic Ages of Earth History
		During these ice ages, glaciers accumulate on land a substantial quantity of the earth's water in the form of ice and cause the water levels in the world's oceans to drop.
	www.magicdragon.com /UltimateSF/timelineCO.html (13090 words)

	Geologic Ages (Site not responding. Last check: 2007-11-06)
		Table is read bottom to top: lower boundaries for Ages are given.
		MYA = Million (years) ago; how long ago the age began.
		My = Million years; how long the age or period lasted.
	members.aol.com /sfc57/gospel/Geologic_Time.htm (34 words)

	Young World Evidence - ChristianAnswers.Net (Site not responding. Last check: 2007-11-06)
		The point is that the maximum possible ages are always much less that the required evolutionary ages, while the biblical age (6,000-10,000 years) always fits comfortably within the maximum possible ages.
		Strong geologic evidence(14) exists that the Cambrian Sawatch sandstone -- formed an alleged 500 million years ago -- of the Ute Pass Fault, west of Colorado Springs, was still unsolidified when it was extruded up to the surface during the uplift of the Rocky Mountains, allegedly 70 million years ago.
		Evolutionary anthropologists say that the Stone Age lasted for at least 100,000 years, during which time the world population of Neanderthal and Cro-magnon men was roughly constant, between one and 10 million.
	christiananswers.net /q-aig/aig-c012.html (1965 words)

	Chpter Eleven
		On geologic time-scales, global climate periodically undergoes major shifts between a relatively warm ice-free state and and an ice age period with continental ice sheets.
		The Pleistocene is sometimes misnamed an ice age, but it is only the most recent phase of the Late Cenozoic Ice Age which witnessed the rise of mammals and humanity (2003 deBlij et al.).
		Data retrieved as a result are atmospheric temperatures (from oxygen isotopes) CO2 and methane concentrations from bubbles trapped in the ice volcanic activity from electrical conductivity variations caused by sulfates, aerosol load and sources (2003 Barry and Chorley).
	www.accd.edu /sac/earthsci/sgirhard/1372/chap11.htm (1141 words)

	MAGNITUDE AND TIMING OF TERRESTRIAL BOLIDE IMPACTS: IMPLICATIONS FOR MASS EXTINCTION SEVERITY DURING THE MESOZOIC AND ... (Site not responding. Last check: 2007-11-06)
		The severity of four mass extinctions during the Mesozoic and Cenozoic are suggested to be a function of the total kinetic energy received from extraterrestrial objects colliding with the Earth.
		Forty-one geologic ages (or epochs) spanning the Mesozoic and Cenozoic are analyzed using the terrestrial cratering record for kinetic energy (Mt TNT/age) from impacting extraterrestrial objects.
		The forces of erosion and plate tectonics have served to remove and obscure the majority of the terrestrial cratering record, therefore it is impossible to prove the absence of an impact for a given geologic age.
	gsa.confex.com /gsa/2002NC/finalprogram/abstract_32110.htm (459 words)

	Geologic Map of Kentucky (Site not responding. Last check: 2007-11-06)
		The geologic ages shown are periods of time when the rocks were sediments just deposited.
		These are very large groupings of rock strata based on the geologic time scale.
		Groups can be divided into smaller units called formations (each tens to hundreds of feet thick); formations may be divided into smaller units called members (usually tens of feet thick); and the smallest units are beds, which usually represent a distinctive layer of rock.
	www.uky.edu /KGS/coal/webgeoky/pages/geologymap.html (448 words)

	The stratigraphic record and fossils (from Earth) -- Britannica Student Encyclopedia
		Fossils help geologists establish the relative geologic ages of layers of rock.
		Index fossils are the basis for defining boundaries in the geologic time scale and for...
		Included in the Earth sciences are the geological, the hydrological, and the atmospheric sciences, which are concerned respectively with the nature and behavior of the Earth itself, the water, and the air.
	www.britannica.com /ebi/article-199832 (987 words)

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