
	Where results make sense

Topic: Middle Ordovician

In the News (Fri 13 Nov 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Collections/Institute of Paleobiology
		Ostracods from the Middle Miocene from the Lapczyca-I borehole, Poland.
		Bolboforms from the Middle Miocene from the Jamnica borehole, Poland.
		Microfossils from the Middle Miocene evaporite-bearing deposists from Dzialoszyce, Carpathian Foredeep, Poland.
	www.paleo.pan.pl /collect.htm (2319 words)

	Ordovician - Wikipedia, the free encyclopedia
		The Ordovician period is the second of the six (seven in North America) periods of the Paleozoic era.
		The Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879, to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same rock beds in northern Wales into the Cambrian and Silurian periods respectively.
		Lapworth, recognizing that the fossil fauna in the disputed strata were different from those of either the Cambrian or the Silurian periods, decided they should be placed in a period of their own.
	en.wikipedia.org /wiki/Ordovician (518 words)

	Palaeontology - Research - What are Trilobites?
		Dinesus ida Etheridge, 1896, Middle Cambrian, VIC, QLD.
		Tasmacephalus platypus Bentley and Jago, 2004, Middle Cambrian, TAS.
		Jell, P.A. Pagetia ocellata, a new Cambrian trilobite from northwestern Queensland.
	www.austmus.gov.au /palaeontology/research/trilobites03.htm (7467 words)

	The Ordovician Period of the Paleozoic Era
		The boundary between the Cambrian and the Ordovician is marked by the appearance of planktic dictyonemid graptolites.
		From the Early to Middle Ordovician, the earth experienced a milder climate in which the weather was warm and the atmosphere contained a lot of moisture.
		Ordovician strata are characterized by numerous and diverse trilobites and conodonts (phosphatic fossils with a toothlike appearance) found in sequences of shale, limestone, dolostone, and sandstone.
	www.science501.com /PTOrdovician.html (1229 words)

	Ordovician Period
		The Green Point GSSP for the base of the Ordovician System, as well as the base of the Lower Ordovician Series and the lowest stage, was approved by the International Commission on Stratigraphy in December 1999 and ratified by the IUGS in January 2000.
		The Ordovician was an age of evolutionary experimentation, in which new organisms evolve to replace those that died out at the end of the Cambrian.
		Gagnier, Pierre-Yves 1995: Ordovician Vertebrates and Agnathan Phylogeny.
	www.peripatus.gen.nz /paleontology/Ordovician.html (2808 words)

	AllRefer.com - Ordovician period (Geology And Oceanography) - Encyclopedia
		Ordovician period [Ord u vish´ u n] Pronunciation Key [from the Ordovices, ancient tribe of N Wales], second period of the Paleozoic era of geologic time (see Geologic Timescale, table) from 505 to 438 million years ago.
		In the Middle Ordovician the sea spread over North America to a greater extent than in any other period and laid down the Trenton limestone, which in its eastern section is overlaid or intercalated with the Utica mud shale.
		Among the economic resources of the Ordovician strata are oil, natural gas, the lead and zinc of Wisconsin, Iowa, and Illinois, the "Portland cement rock" of Pennsylvania and New Jersey, Vermont marble, and the calcium phosphate of the Tennessee limestone.
	reference.allrefer.com /encyclopedia/O/Ordovici.html (529 words)

	Preliminary investigation on Early to Middle Ordovician brachiopod biodiversity of South China (Site not responding. Last check: 2007-10-06)
		The Ordovician Period encompasses one of the most profound evolutionary radiations (Sepkoski, 1995), which lasted for several millions of years (Droser and Sheehan, 1995) and was manifested as three diversity maxima from Middle to Late Ordovician (Webby, 2000).
		The first diversity maximum of Ordovician brachiopods of South China is in late Early Ordovician, i.e., late early Arenig, while the first diversity increase of international trend commenced about the beginning of the Middle Ordovician, and reached a peak in the early Darriwilian (Webby, 2000).
		The Ordovician radiation of brachiopods in South China reaches its first peak in this interval (Figure 2); it was mainly manifested by the generic and familial sharp increase: 45 genera belonging to 7 orders, 12 superfamilies and 24 families.
	www.unt.edu.ar /fcsnat/INSUGEO/geologia_17/61.htm (2332 words)

	Ordovician (Site not responding. Last check: 2007-10-06)
		The Ordovician follows the Cambrian period and is followed by the Silurian period.
		The Ordovician -- named after the Welsh tribe of the Ordovices -- was defined by Charles Lapworth in 1879 to resolve a situation where followers of Adam Sedgwick and Roderick Murchison were placing the same rock beds in the Cambrian and Silurian periods respectively.
		Ordovician rocks contain abundant fossils and contain major oil and gas reservoirs in some regions.
	www.yotor.com /wiki/en/or/Ordovician.htm (442 words)

	Palaeos Paleozoic : Ordovician : The Ordovician Period
		Ordovician trilobites were for the most part quite different from their Cambrian predecessors.
		During the Ordovician the Crinoids, rare during the Cambrian, suddenly appear and diversify in large numbers.
		Their cousins the conodont animals, worm-like or eel-like organisms known mostly from numerous isolated denticles (which were used to support some kind of grasping or breathing structure in the mouth or throat) represent a major component, quite possibly predators and certainly nektonic/pelagic, in the marine food-chain.
	www.palaeos.com /Paleozoic/Ordovician/Ordovician.htm (2036 words)

	Middle Ordovician K (Site not responding. Last check: 2007-10-06)
		During the Ordovician, this margin was submitted to extension which originated a set of microplates formed by continental crust (Avalonia, Armorica and Cimmerian) which drifted northwards up to collide with Laurentia, Baltica and Siberia plates (McKerrow and Scotese, 1990; Unrug, 1997; Franke, 2001; Matte, 2001).
		Classification of the Libyan Ordovician volcanic rocks on the Winchester and Floyd (1977) diagram.
		Associated achritarch microfossils indicate that the sandstones and interbedded K—bentonites are Middle Ordovician in age.
	www.unt.edu.ar /fcsnat/INSUGEO/geologia_17/33.htm (1388 words)

	USGS Professional Paper 1151-H: The Geology of Kentucky: Ordovician System
		By far the largest area of exposure of the Ordovician rocks is in central and north-central Kentucky along the crest and flanks of the Cincinnati arch (figs.
		The seas became shallower during the middle of the Late Ordovician, and deposition of the limestone and shale lithofacies shifted northward, where it composes the Fairview Formation.
		The seas became still shallower in the later part of the Late Ordovician, and lagoonal and tidal-flat deposits were formed in the southern part of the region while shelly rocks were formed in relatively deeper water in the northern areas.
	pubs.usgs.gov /prof/p1151h/ordo.html (5480 words)

	UALR - Department of Earth Sciences
		Conodont Biostratigraphy of the Middle Ordovician Joachim Dolomite of North-Central Arkansas.
		A fused cluster of Ozarkodina (Plectodina) Joachimensis (Conodonta, Prioniodontida) Pa elements from the Middle Ordovician Joachim Dolomite, north-central Arkansas.
		K-bentonite and conodont stratigraphy of the Blackriveran-Trentonian (Ordovician) interval in the Upper Peninsula of Michigan and southern Ontario.
	www.ualr.edu /~ersc/leslie_grants.html (1616 words)

	[No title]
		Strontium isotope stratigraphy of the Middle Devonian; Brachiopods and conodonts.
		New Middle Triassic conodonts of the Gondolella szaboi-G. trammeri lineage from the west Capathian Mountains and from the southern Alps.
		Microfossils in Middle Ordovician K-bentonites from the Precordillera of Argentina [abs.].
	www.le.ac.uk /geology/map2/pander/pander97/papers.txt (10262 words)

	Journal of Paleontology: New Middle and Late Ordovician hyoliths from Estonia
		Zazvorka's (1930) monograph on Ordovician hyoliths from Bohemia was the last ever produced on this group until the relatively recent studies on specimens from Siberia and China, although these works are devoted mostly to Early Cambrian forms (see Missarzhevsky, 1969 and Qian, 1989, and references in both).
		Ordovician hyoliths are known from Russia (Hynda, 1981), Asia (Salter and Blanford, 1865; Reed, 1915), and Morocco (Marek, 1983b).
		Given that at present Ordovician hyolith faunas remain poorly known on a global scale, the basis for any discussion of geographic distribution of hyolith taxa in the Ordovician is limited.
	www.findarticles.com /p/articles/mi_qa3790/is_200303/ai_n9168051 (1383 words)

	Ordovician Fossils In The Toquima Range, Central Nevada (Site not responding. Last check: 2007-10-06)
		The Vinini is an incredibly widespread unit throughout central Nevada, a dominantly siliceous assemblage of shales, siltstones, cherts and quartzites that bear sporadic occurrences of abundant graptolites.
		At Ikes Canyon the Middle Ordovician Antelope Valley Limestone is roughly 950 feet thick, yielding prodigious numbers of fossilized shelly creatures.
		The prominent outcrops of the Middle Ordovician Antelope Valley Limestone immediately north of the mouth of Ikes Canyon, Nye County, Nevada, yield common to abundant silicified invertebrate fossils, including brachiopods (arguably the most common fossil type encountered), echinoderm debris, trilobites, sponges, ostracodes, conodonts, bryozoans, pelecypods, cephalopods and gastropods.
	members.aol.com /Waucoba7/tr/toquima.html (2549 words)

	Palaeos Paleozoic: Ordovician: The Middle Ordovician (Site not responding. Last check: 2007-10-06)
		The traditional division of the Middle Ordovician into Llanvirn and Llandielo has been replaced by the Ordovivian III and the Darriwilian.
		The Ordovician III includes only the Early Llanvirn, and the remainder of the Middle Ordovician is included in the Darriwilian.
		As with most of the Ordovician, our coverage is limited to a few typical animals.
	www.palaeos.com /Paleozoic/Ordovician/MidOrd.html (134 words)

	Ordovician Fossils At The Great Beatty Mudmound, Nevada
		In general, Ross concluded, the fossil fauna from the Beatty bioherm closely resembles fossil assemblages from similar Middle Ordovician limestone structures in Quebec and Newfoundland.
		from the Beatty mudmound, Middle Ordovician Antelope Valley Limestone.
		The dark grayish twig-like specimens on the slab of limestone are fossil bryozoans, species undetermined, from the Middle Ordovician Antelope Valley Limestone, Beatty bioherm, Nye County, Nevada.
	members.aol.com /Waucoba7/beatty/beattyfossils.html (3725 words)

	Paleobiology 22() - authorname
		However, genus level turnover in the Middle and Upper Ordovician is not likely to be influenced by taxonomic bias and appears to be as stable as our estimates of alpha diversity.
		The Ordovician Radiation was also alive and well in Middle Ordovician of western New York, a major source of information in Sepkoski and Miller's study (1985: p.
		The apparent decoupling of local species diversity from global taxonomic diversity suggests that factors such as declining provinciality during the Ordovician (Whittington and Hughes 1972) may be important in the history of the group.
	www.uic.edu /orgs/paleo/24-4/Pb244Wes.htm (2165 words)

	Tectonics of the Ordovician
		During the Ordovician, most of the world's land was collected together in the super-continent Gondwana.
		Throughout the Ordovician, Gondwana moved towards the South Pole where it finally came to rest at the end of this period.
		Also during the Middle Ordovician, latitudinal plate motions appear to have taken place, including the northward drift of the Baltoscandian Plate (northern Europe).
	www.ucmp.berkeley.edu /ordovician/ordotect.html (469 words)

	Pennsylvania Geological Survey: Trenton Black River Carbonates
		Chavetz, H.S., 1969, Carbonates of the Lower and Middle Ordovician in central Pennsylvania.
		Thompson, R.R., 1963, Lithostratigraphy of the Middle Ordovician Salona and Coburn formations in central Pennsylvania.
		Wagner, W.R., 1966, Stratigraphy of the Cambrian to Middle Ordovician rocks of central and western Pennsylvania.
	www.dcnr.state.pa.us /topogeo/tbr/refs.aspx (2859 words)

	Zhang Jianhua (Site not responding. Last check: 2007-10-06)
		Middle Ordovician conodonts from the Atlantic Faunal Region and the evolution of key conodont genera
		The studied conodont specimens were obtained from three Middle Ordovician sections in south China and four Middle Ordovician sections in Sweden.
		The Middle Ordovician Guniutan Formation in south China has been demonstrated to be closely similar to the "Orthoceratite limestone" in Baltoscandia as regards facies, stratigraphic development, and conodont biostratigraphy.
	www.su.se /forskning/disputationer/spikblad/ZhangJianhua.html (264 words)

	Base of the Middle Ordovician (Site not responding. Last check: 2007-10-06)
		As an alternative to a Tripodus combsi-laevis defined Middle Ordovician boundary, Albanesi and Carrera (2000) propose defining that boundary at the FAD of the conodont Protoprioniodus aranda Cooper, and I support that proposal for several reasons.
		Thus, as conodont icon of the Middle Ordovician base, I join Albanesi and Carrera in proposing use of the FAD of Protoprioniodus aranda Cooper.
		Should there still be strong support for retaining the now-classical name Whiterockian for the lower Middle Ordovician series, however, the basal boundary will have to be moved downward to a point in the Ninemile Shale some 18 m below the FAD of Tripodus combsi-laevis in the Whiterockian stratotype section.
	seis.natsci.csulb.edu /ord1/disc1/0000000a.htm (521 words)

	Solutions From the Field - Exploring Appalachia's Middle Ordovician Carbonates (Site not responding. Last check: 2007-10-06)
		During the Ordovician, the Appalachian Basin became the archetypal geosyncline, a foreland trough formed by subduction, loading, and collision along the plate margin.
		The Central Appalachian segment of the foreland was broader than the segments to both the north and the south, and a structural hinge located in West Virginia separated the Appalachian Basin proper to the west from the foreland trough to the east.
		Middle Ordovician Trenton and Black River limestones were deposited as an eastward sloping ramp that thickened into the rapidly subsiding deep foreland trough.
	www.pttc.org /solutions/201.htm (1245 words)

	Middle and Late Ordovician Epeiric Sea Circulation, Environmental Change, and Biotic Turnover: Model and Data Synthesis
		Although rare today because of the overall lowstand of sea level, epeiric seas were widespread in the past during highstands of sea level, such as the early and middle Paleozoic, and for many times provide the only record we have of the marine realm.
		Given the importance of epeiric seas for the record of global marine diversity and given the lack of modern analogues for epeiric seas, a systematic approach to the study of these ancient systems is warranted.
		The main goals of the study are 1) to apply a quantitative circulation model to Middle and Late Ordovician epeiric seas of Laurentia to test various hypotheses of circulation and 2) to identify mechanisms of rapid oceanographic change that caused faunal extinction and immigration events.
	www.geosc.psu.edu /~sling/ORDOVICIAN/patz_summary.html (750 words)

	Nashville Fossils and Stratigraphy
		Díaz, J.R., 1996, Meteoric diagenesis of Ordovician limestones from Cannon County, Tennessee: unpublished M.S. thesis, University of Georgia, 61 p.
		Maniatis, J.K., 1969, Carbonate petrography of Middle and Upper Ordovician rocks of the Central Basin of Tennessee: unpublished M.S. thesis, Vanderbilt University.
		Siewers, F., 1988, Hardgrounds in the Middle Ordovician Lebanon Limestone, Central Basin, Tennessee: M.S. thesis, Vanderbilt University.
	www.uga.edu /~strata/nashville/references/stratReferences.html (1287 words)

	The Ordovician (Site not responding. Last check: 2007-10-06)
		The Ordovician period began approximately 510 million years ago, with the end of the Cambrian, and ended around 445 million years ago, with the beginning of the Silurian.
		More recently, there has been found evidence of tetrahedral spores that are similar to those of primitive land plants, suggesting that plants invaded the land at this time.
		The Ordovician Period is part of the Paleozoic Era.
	www.ucmp.berkeley.edu /ordovician/ordovician.html (318 words)

	Ordovician Cephalopods in Utah (Site not responding. Last check: 2007-10-06)
		Ordovician cephalopods are numerous and varied in the
		The Ordovician fossil cephalopods found in Utah are usually not very well preserved, alot of times all you find are endocerid endosiphocones, or partial phragmocones contained in large ledges or boulders.
		The identification of these fossils requires sectioning, so most of the fossils I find are left in the field, and almost all of the photos were taken in the field.
	www.ammonoid.com /Ordovician.html (232 words)

	CT DEP: Bedrock Geology Detailed Data Guide Support (Site not responding. Last check: 2007-10-06)
		Black to dark-or silvery-gray, rarely layered schist or phyllite, composed of quartz, albite, and commonly garnet and staurolite or sillimanite (locally strongly retrograded to chlorite and muscovite).
		Dark, fine- to medium-grained, well-layered amphibolite and hornblende gneiss, composed or hornblende and plagioclase, commonly with biotite, garnet, or epidote, interlayered with light-gray felsic gneiss and pink quartz-spessartine rock (coticule).
		Chiefly gray, medium-grained, well-layered granofels, composed of quartz, oligoclase, and biotite, commonly with garnet and sillimanite, interlayered with thinly fissile sillimanitic, graphitic, pyrrhotitic biotite schist and with calc-silicate rock
	dep.state.ct.us /gis/dataguides/dep/layers/support/bedrock/detailed.htm (4718 words)

	USGS Open-File Report 02-302
		The objective of this study is to enhance existing thermal maturity maps in Pennsylvania by establishing: 1) new subsurface CAI data points for the Ordovician and Devonian and 2) new %Ro and Rock Eval subsurface data points for Middle and Upper Devonian fl shale units.
		Thermal maturity values for the Ordovician and Devonian strata are of major interest because they contain the source rocks for most of the oil and natural gas resources in the basin.
		Improved CAI-based thermal maturity maps of the Ordovician are important to identify areas of optimum gas generation from the Utica Shale and to provide constraints for interpreting the origin of oil and gas in the Lower Silurian regional accumulation and Ordovician Black River-Trenton fields.
	pubs.usgs.gov /of/2002/of02-302 (339 words)

Try your search on: Qwika (all wikis)