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Topic: Geologic formation

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	What is a formation? - Utah Geological Survey
		Formations are given names that include the geographic name of a permanent feature near the location where the rocks are well exposed.
		Formations often contain a variety of related or interlayered rock types, and in these cases the word ‘formation’ is used instead of a single rock type.
		Before a new formation name will be accepted, a formal definition including a full description of the unit and the location of the type locality must appear in a widely known scientific publication available to geologists.
	geology.utah.gov /surveynotes/gladasked/gladformation.htm (385 words)

	Geologic formation: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-10-09)
		Geologic formation: Facts and details from Encyclopedia Topic
		"Formation" is also used to describe the sometimes odd shapes (forms) that rocks acquire through erosional or depositional processes.
		A stalagmite (from the greek stalagma, "drop") is a type of speleothem that rises from the floor of a limestone cave due to the dripping of mineralized...
	www.absoluteastronomy.com /encyclopedia/g/ge/geologic_formation.htm (176 words)

	Pneumatic Fracturing, Hydraulic Fracturing, Soil Fracturing, Insitu Chemical Treatment, In Situ Chemical Treatment, ...
		It is important to thoroughly evaluate the geotechnical characteristics of the formation during the design phase of a fracturing project.
		The ability of a formation to self-prop depends both on the depth and the strength of the geologic material.
		A principal use of fracturing is to increase the effective hydraulic and pneumatic conductivity of the geologic formation being treated.
	www.arstechnologies.com /pneumatic_fracturing.html (2118 words)

	DOE - Fossil Energy: Carbon Sequestration in Geologic Formations
		Carbon dioxide sequestration in geologic formations includes oil and gas reservoirs, unmineable coal seams, and deep saline reservoirs.
		For example, studies are being done to determine the extent to which the CO2 moves within the geologic formation, and what physical and chemical changes occur to the formation when CO2 is injected.
		Second, most existing large CO2 point sources are within easy access to a saline formation injection point, and therefore sequestration in saline formations is compatible with a strategy of transforming large portions of the existing U.S. energy and industrial assets to near-zero carbon emissions via low-cost carbon sequestration retrofits.
	www.fossil.energy.gov /programs/sequestration/geologic/index.html (855 words)

	Paleontology - Glossary of Terms
		An arbitrary chronologic sequence of geologic events, used as a measure of the age of any part of geologic time, usually presented in the form of a chart showing the names of the various rock-stratigraphic, time-stratigraphic, or geologic-time units.
		Age in years for geologic materials are calculated by measuring the presence of a short-life radioactive element, e.g.
		An era of geologic time, from the end of the Precambrian to the beginning of the Mesozoic, spanning the time between 544 and 248 million years ago.
	scienceviews.com /dinosaurs/glossary.html (2415 words)

	The Entire Geologic Column in North Dakota
		Above this is the Birdbear formation with desiccation, caliche development (caliche is widespread in west Texas- a dry area) and burrows (Ehrets and Kissling, 1983, p.
		The upper Mission Canyon formation (of the northwestern states and the Williston Basin) or the Livingstone formation (of Alberta) is more interesting, not only for its contribution to mountain scenery but also for its lithology and importance as an oil reservoir.
		The Golden Valley Formation is made of two layers, a hard kaolinitic claystone and an upper member made of sandstone lenses interspersed with parallel bedding made from finer grained material as well as numerous incised channels cutting through the section.
	www.talkorigins.org /faqs/geocolumn (7046 words)

	Delta (geologic formation) - MSN Encarta
		Delta (geologic formation), deposit of soil or silt formed wherever a swift stream or river empties into a lake, ocean, or slower river, so called because its triangular shape resembles the Greek letter (delta).
		The triangular shape and the great width at the base are due to blocking of the river mouth by silt, with resulting continual formation of distributaries at angles to the original course.
		Deltas are usually characterized by highly fertile soil.
	encarta.msn.com /encyclopedia_761552626/Delta_(geologic_formation).html (150 words)

	NPS: Nature & Science » Geology Resources Division
		Geologic resources and the dynamic processes that affect them are inspiring to behold, form the foundation of park ecosystems, and are essential to understanding the natural world.
		The GRE Program is an on-going inventory that provides parks with a digital geologic map, a geologic evaluation report, and a geologic bibliography.
		Each of the three basic rock types was used in the construction of the Lincoln Memorial in Washington DC; igneous granite is found in the base and lower steps of the memorial, the floor and statue of President Lincoln are made of metamorphic marble, and the interior columns and walls are composed of sedimentary limestone.
	www2.nature.nps.gov /geology (331 words)

	Dinosaurs and Other Fossils
		From a scientific viewpoint, however, the study of dinosaurs and other ancient life is important both for understanding the causes of past major extinctions of land animals and for understanding the changes in biological diversity caused by previous geological and climatic changes of the Earth.
		The study of the Earth from the beginning of time to the present can be broken down into sections called geological eras, periods, and epochs.
		Paleontology is the study of life in past geologic time and this glossary includes many of the terms used by paleontologists.
	scienceviews.com /dinosaurs (296 words)

	American Ground Water Trust - Glossary of Terms
		(1.)The three dimensional sub-surface geometry of a geologic rock formation (or, group of rock formations or part of a formation) that contains ground water in the spaces between sediment grains, in voids, or in fractures.
		Use of the term aquifer is usually restricted to those water-bearing formations capable of yielding water in sufficient quantity to constitute a usable supply source.
		The pressure in such an aquifer commonly is called artesian pressure, and the formation containing artesian water is an artesian aquifer or confined aquifer.
	www.agwt.org /info/A_Terms.asp (1181 words)

	Everything Fossils...Fossil Information for Education, Collecting and Fun!
		Trilobites are the prolific three-lobed arthropods that signal the beginning of the Paleozoic explosion of Life forms.
		The purpose of this geologic time line is to help you easily find in-depth information on eons, eras, and periods of earths history.
		A collection of earth science lesson plans focused on geologic time, earth's history, and the development of life on earth.
	www.fossils-facts-and-finds.com (1010 words)

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