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Topic: Geosyncline

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	Geosyncline - MSN Encarta
		A geosyncline begins as a belt of especially active sedimentation and eventually becomes trough-like.
		Two kinds of geosynclines were later identified: miogeosynclines, developed along continental shelves, and eugeosynclines, developed seawards along continental rises.
		Miogeosynclines are found where rivers bring enough sediment to the sea for huge, subsiding deltas to form, as at the mouths of the Nile and the Mississippi.
	uk.encarta.msn.com /encyclopedia_761567797/Geosyncline.html (225 words)

	Adelaide Geosyncline at AllExperts
		The sediments in the geosyncline were deposited in a period of geological time known as the Adelaidean, which stretches from sometime between 870 Ma and 700 Ma (the later Neoproterozoic) to the end of the era, and 500 Ma (the end of the Cambrian).
		Not all of the Geosyncline experienced tectonic activity; the deposits in the Stuart Shelf to the northwest remained undisturbed (and still do today), while limestones and shales were deposited in the Cooper and Pedirka Basins to the north and northeast.
		Fossils are to be found in the Geosyncline; those discovered in the Ediacara Hills of the northern Flinders in 1946 are of worldwide significance for being some of the oldest examples of fossilised animal life ever found.
	en.allexperts.com /e/a/ad/adelaide_geosyncline.htm (489 words)

	BANGLAPEDIA: Geosyncline (Site not responding. Last check: 2007-10-19)
		Geosyncline a part of the earth crust that sank deeply through time.
		A geosyncline generally forms along continental edges, and is destroyed during periods of crustal deformation, which often produces folded mountain ranges.
		Bengal Geosyncline is one of the world's largest geosyncline that includes the bengal basin and the bay of bengal.
	banglapedia.net /HT/G_0087.HTM (150 words)

	Isostacy and Geosynclines
		Dana's geosynclinal theory was expanded and modified by others such as the Austrian geologist, Edward Suess (1831-1914).
		Geosynclinal theory was a primary theory of the Earth until the discovery of seafloor spreading and the advent of plate tectonic theory in the 1960s.
		The geosynclinal concept and deformation derived from a contracting Earth, although very appealing, could not explain all of the observations.
	www.columbia.edu /~vjd1/isostacy_geosynclines.htm (784 words)

	09hist (Site not responding. Last check: 2007-10-19)
		The concept was immediately 'marketed' by Dietz (1963) in explanation of the formation of continental geosynclines, where miogeosynclines were held to represent the shallow-marine environment of continental margins, and the eugeosynclines the deformed and metamorphosed equivalents (flysch) of the deep-water continental slope, rise and abyssal plane.
		The geosynclinal ophiolites were considered to be pieces of oceanic crust physically incorporated into the slope and rise sequences during deformation provoked by sea-floor spreading, and granites the result of melting of the slope and rise sediments as a result of the same actions.
		Geosynclines' were therefore reinterpreted to represent amalgamated remnants of continental margin sedimentary/volcanic sequences and oceanic crust (with the latter represented by the ophiolites of geosynclines) whereas 'orogens' were considered to result from collision of continents following ocean closure.
	instruct.uwo.ca /earth-sci/200a-001/09hist.htm (954 words)

	Chapter 1
		Paleozoic rocks on the edge of the geosynclinal basin, updip from the strata that underlie the Austin area, are exposed in the Llano region to the northwest.
		The Cenozoic history of the Gulf of Mexico geosyncline is dominantly the story of gradual withdrawal of the seashore to its present position, accompanied by the deposition and distribution of marine sediments, then sediments deposited by deltaic and shoreline processes and finally terrigenous sediments deposited by fluvial systems.
		The Austin area, already on the margin of the geosyncline at the start of the era, was not an area of major sedimentary deposition during the Cenozoic.
	www.lib.utexas.edu /geo/ggtc/ch1.html (1806 words)

	The Story of Geosynclines
		In the 1970's geologists began to realize there was another way to make a geosyncline; form the two parts separately and join them later by plate collisions.
		The story of geosynclines is a superb illustration of how scientists can be hampered by conceptual models, and how returning to the actual data and reinterpreting it can solve a problem.
		The term "geosyncline" is still sometimes used simply because it has a widely-understood meaning.
	www.uwgb.edu /dutchs/platetec/geosync.htm (658 words)

	Garrett County History - G010911A
		A good example of this folding is the geosyncline which carries the water of the North Branch of the Potomac River.
		The eastern face of this geosyncline is the formation generally referred to as Allegheny Front.
		Between the geosynclines which carries these two rivers is a geoanticline, which is called the “Deer Park Anticline.” On top of this anticline can is found a series of glades such as the Pleasant Valley area with “Yough Glades”, or “Cherry Glades” found on top of Meadow Mountain.
	www.deepcreeklake.com /gchs/history/G010911A.htm (681 words)

	Geosyncline - Wikipedia, the free encyclopedia
		A geosyncline is a largely obsolete term for a subsiding linear trough that was caused by the accumulation of sedimentary rock strata deposited in a basin and subsequently compressed, deformed, and uplifted into a mountain range, with attendant volcanism and plutonism.
		An orthogeosyncline is a linear geosynclinal belt lying between continental and oceanic terranes, and having internal volcanic belts (eugeosynclinal) and external nonvolcanic belts (miogeosynclinal).
		A zeugogeosyncline is a geosyncline in a craton or stable area within which is also an uplifted area, receiving clastic sediments, also known as yoked basin.
	en.wikipedia.org /wiki/Geosyncline (610 words)

	KGS--Bulletin 169--Dott
		Rhythmic patterns of sedimentation occur in geosynclinal successions in mobile belts as in strata of more stable cratonic regions, though in the former they are commonly less obvious and are therefore less studied.
		As in the famous cratonic Pennsylvanian, equivalent strata of the eastern Cordilleran geosyncline are notably rhythmic in gross aspect (Fig.
		The marginal cratonic subsidence, so-called "Rocky Mountain geosyncline," was ephemeral as compared to the previous geosynclinal development and is not to be regarded as of the same order of magnitude and tectonic importance.
	www.kgs.ku.edu /Publications/Bulletins/169/Dott/index.html (6808 words)

	Precambrian perambulations (Site not responding. Last check: 2007-10-19)
		Since the type section itself is rather inaccessible we traveled to a more public access along the Brachina Gorge geological trail, a wonderful 20 km long gravel road that transects the gently westward-dipping sediments of the region.
		The basal portion of the geosyncline subsided as new sediments were brought into the area, and most of the 9 kilometer thickness of rocks were laid down close to sea level.
		Geologists have resolved that partially because of a glaciation, and for other reasons, sea-level was fluctuating throughout the 150 million years represented by the rocks in the region.
	heysentrail.asn.au /precamperam.html (1643 words)

	Untitled Document (Site not responding. Last check: 2007-10-19)
		geosyncline was introduced by the American geologist James Hall in
		Two segments of a geosyncline are recognizable in the rock strata of
		Aside from the parts or segments of a geosyncline, several types of
	tlacaelel.igeofcu.unam.mx /~GeoD/colision/figs/orogeny/geosyncline.html (203 words)

	Australia: World of Earth Science (Site not responding. Last check: 2007-10-19)
		The Musgrave block near the continent's center, a component of the Adelaidian geosyncline, was formed by the repeated intrusion of molten rocks between 1.4 billion to one billion years ago during the Proterozoic Era when algae, jellyfish, and worms first arose.
		The rocks of the Adelaidian geosyncline are as thick as 10 mi (16 km) with sediments that have been extensively folded and subjected to faulting during late Precambrian and early Paleozoic times (about 600 million to 500 million years ago).
		They also consider the Adelaide geosyncline to be the precursor of another downwarp related to the most extensive folded belts on the continent, namely the Tasman geosyncline along Australia's east flank.
	science.enotes.com /earth-science/australia (2769 words)

	The Paleozoic Era (Site not responding. Last check: 2007-10-19)
		In North America the era began with submerged geosynclines, or downward thrusts of the Earth’s crust, along the eastern, southeastern, and western sides of the continent, while the interior was dry land.
		Beginning in the Ordovician period, mountain building intermittently proceeded in the eastern part of the Appalachian geosyncline throughout the rest of the era, bringing in new sediments.
		Sediments washing from the Acadian Mountains filled the western part of the Appalachian geosyncline to form the famous coal swamps of the Carboniferous period.
	www.science501.com /PTPaleozoic.html (795 words)

	[No title]
		Description of Concepts Geosyncline- A relatively thick sequence of sedimentary and or volcanic rocks that was deposited within a subsiding linear zone of the crust and that was up heaved to form mountains.
		Discussion Question Before deposition can occur to form a geosyncline a depression must exist to allow the sediments a place to go.
		Objectives/Importance Geosyncline is an evolving term used to explain the linkage between thick sedimentary sequences and mountain belts.
	www.gsu.edu /~geowce/file/geosyncline8000.doc (473 words)

	NPS Publications: Geology of Rocky Mountain NP
		In order to accomodate the deposition of many thousands of feet of sediments which are known to have accumulated, the floor of the basin must have been sinking in relation to the surrounding areas which furnished the source of the detrital materials.
		One of these, known as the Cordilleran geosyncline, is known to have occupied the site of the present Rocky Mountains extending from Mexico across parts of Arizona, New Mexico, Colorado, Utah, Wyoming, Idaho, Montana, Alberta and British Columbia, and northward across Eastern Alaska.
		When the continents were depressed in relation to sea level, the ocean waters entered these troughs, and if the continent was extensively depressed the waters spread beyond the margins of the geosynclines flooding the adjoining areas.
	www.cr.nps.gov /history/online_books/berkeley/effinger2/effinger2e.htm (454 words)

	Mesozoic era - HighBeam Encyclopedia (Site not responding. Last check: 2007-10-19)
		The Appalachian geosyncline, or downward thrust of the earth's crust, was replaced by the Appalachian Mts., and the eastern part of the continent was elevated during most of the era.
		The Appalachians were subjected to erosion, the products of which were deposited along the Atlantic coast, which had become a lowland region, or in the ocean beyond.
		Aside from the Appalachians, the other dry (consistently) areas of the continent were the Canadian Shield, the Antilles areas, and a mountain range elevated in part of the Cordilleran geosyncline.
	www.encyclopedia.com /doc/1E1-mesozoic.html (436 words)

	Dacryoconarid tentaculites in the mid-Paleozoic euxinic facies of the Malayan geosyncline -- Burton 41 (2): 449 -- ...
		Dacryoconarid tentaculites in the mid-Paleozoic euxinic facies of the Malayan geosyncline -- Burton 41 (2): 449 -- Journal of Paleontology
		Dacryoconarid tentaculites in the mid-Paleozoic euxinic facies of the Malayan geosyncline
		Similar admixture of faunas may occur elsewhere at the corresponding stage of geosynclinal evolution.
	jpaleontol.geoscienceworld.org /cgi/content/abstract/41/2/449 (222 words)

	Andean Geosyncline (Site not responding. Last check: 2007-10-19)
		A linear trough in the Earth's crust in which rocks of the Mesozoic Era (245 to 66.4 million years ago) and Cenozoic Era (66.4 years ago to the present) were deposited in South America.
		An intense orogenic (mountain-building) event affected the older sediments in the geosyncline in the Late Cretaceous Epoch (97.5 to 66.4 million years ago) and, combined with later deformational episodes, produced a pattern of scattered marine deposition in basins along the western margin of the geosyncline.
		The total area of deposition was great enough for some geosynclinal segments to be separately named--e.g., the Venezuelan-Peruvian Geosyncline.
	tlacaelel.igeofcu.unam.mx /~GeoD/colision/figs/orogeny/andes.html (200 words)

	Geology of the Kakadu Region
		The oldest rock formations in the Park are a mixture of sedimentary rock, laid down in a large geological depression called the Pine Creek Geosyncline, and igneous or volcanic rocks.
		High areas eroded and deposited as sediments in geosyncline.
		The overall geological evolution is the same, but the period between the deep weathering of the ancient land surface (the Pine Creek Geosyncline) and the deposition of the Kombolgie Formation sandstone was marked by intense faulting, granite intrusion and volcanic activity.
	www.deh.gov.au /parks/kakadu/plantsanimalsland/geology.html (1359 words)

	Sherpa Guides \| Tennessee \| The Tennessee Mountains \| Upper Unaka Mountains
		About 600 million years ago, sediments collected in a sinking trough (geosyncline) on the Unakas' western side and formed the Ocoee Supergroup and Chilhowee Group that make up most of the present-day Unaka Range.
		A period of folding took place about 470 million years ago during the Ordovician Period, when the older rock was forced over the younger rock of the Ocoee and Chilhowee formations.
		Eroded Precambrian rock and marine debris settled into another geosyncline between the Devonian and the Triassic periods, forming new layers of sedimentary rock.
	www.sherpaguides.com /tennessee/upper_unakas/index.html (997 words)

	Red Rock Resources Acquisition
		A large portion of this area situated near the western edge of the Pine Creek Geosyncline close to the old Stuart Highway consists of outcropping hematitic iron ore, with ironstone lenses near the base of a highly lateralized sequence of Cretaceous claystone porcellanite, siltstone and sandstone capped by remnants of nodular laterite.
		Several of the properties have identified uranium mineralisation or uranium anomalies, or are in a mineral field chiefly known for its uranium occurrences.
		Others lie along the Pine Creek Geosyncline, which is associated with uranium mineralisation in many places, and contain iron ore mineralisation indicating that they lie near the redox boundary in areas where the basement rock is known to carry uranium.
	www.advfn.com /news_Acquisition_12673877.html (1518 words)

	Novaculite - Wikipedia, the free encyclopedia
		Novaculite is a form of chert or flint found in the Ouachita Mountains of Arkansas and Oklahoma and in the Marathon Uplift of Texas.
		Novaculite is considered to be geosynclinal highly siliceous sediments and may be a product of the low-grade metamorphism of chert beds.
		The strata were deposited in the Devonian Period and subjected to uplift and folding during the Ouachita orogeny of the Pennsylvanian/Permian Periods.
	en.wikipedia.org /wiki/Novaculite (461 words)

	[No title]
		Ê[[ÕÕÃåPlate Tectonicsand sedimentary geology Early terminology The plate tectonics paradigm shift Geosynclinal theory Early sedimentary geologists identified the presence of thick sedimentary sequences on the continental craton, much of which appeared marine in origin.
		The US and Europeans used the term Geosyncline to refer to entirely different classes of sedimentary sequences).
		Geosynclines - oceans apart American view of the Geosyncline Asymetric, downward warped troughs with thick wedge-shaped accumulations of marginal marine sediments Later uplifted into mountain belts European view of the Geosyncline Symmetric, accumulations of warped deep marine sediments (Flysch) flanked by marginal marine strata (Mollasse) Later uplifted into mountain belts Geosynclinal synthesis?
	www.personal.kent.edu /~jortiz/strat/lec23PlateTectonics.doc (175 words)

	Polar Publishing: Environment of Violence series
		Dvelops his geomechanical theory of tectonics on the evidence of paleopoles and paleoclimates, demonstrating that geosyncline development is an equatorial phenomenon.
		This is new cosmo-chemistry, and it mitigates new geology by introducing entirely new concepts such as metallic composition for the middle and lower mantle, silicate-oxide composition being confined to the upper mantle and crust.
		A new theory of geosyncline development is proven with laboratory models, resolving old enigmas while [presciently] not conflicting with the geoidal deformation concept of geosyncline development set forth by Peter James in his later book of this series.
	polarpublishing.com (1756 words)

	Geology of oil basins of East Indian archipelago -- Schuppli 30 (1): 1 -- AAPG Bulletin
		The oil fields of the Tertiary basins of Sumatra, Java, and Borneo have produced more than one billion barrels of oil to the end of 1940 from sands predominantly of Miocene and Pliocene age.
		Two major geosynclinal belts, the circum-Asiatic geosyncline and the Australo-Pacific geosyncline, meet in the East Indian archipelago.
		The Tertiary basins of Borneo are outside these two belts, lying near the edge of the Asiatic continent, constituting intra-continental geosynclines.
	aapgbull.geoscienceworld.org /cgi/content/abstract/30/1/1 (130 words)

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