
	Where results make sense

Topic: Dextral

Related Topics

Sinistral

Plate boundaries

Spike Witwicky

Halon 1301

Pulse

Worshipful Company of Engineers

List of political parties in Saudi Arabia

Abbreviation

Music of the United Kingdom

List of acronyms and initialisms

International Speedway Corporation

Haemodynamics

BBC

93rd United States Congress

Plate tectonics

In the News (Wed 15 Feb 12)

EXECUTIVE POWER

Iran

ANALYSIS

Pakistan

Family compact

	Land Snails of Pennsylvania: Terminology
		Denticles are often referred to as "teeth," and are supposed to aid in shell positioning, predator deterrence, or calcium provisioning.
		A dextral shell's aperture appears on the right to an observer when the shell is positioned with apex up and umbilicus down and aperture toward the observer.
		All of Pennsylvania's land snails are normally dextral.
	www.carnegiemnh.org /mollusks/palandsnails/terminology.htm (781 words)

	untitled (Site not responding. Last check: 2007-09-15)
		The dextral sense of slip for the Guayape fault is unexpected because the fault is at a low angle to the North America/Caribbean plate boundary which has experienced approximately 1100 km of sinistral slip since the Eocene.
		The dextral sense of slip for the Guayape fault would not have been predicted from the regional tectonic style because the Caribbean/North America plate boundary is a zone of sinistral faulting.
		The valley of Río Sico and the Valle de Jamastrán are pull-apart basins, and the Valle de Azacualpa is a fault wedge basin.
	www.ig.utexas.edu /research/projects/honduras/Gordonchtp5.htm (3774 words)

	[No title] (Site not responding. Last check: 2007-09-15)
		Dextral northwest trending shears, such as the Montaña de Comayagua structural belt (MCSB) (Emmet, 1983), along with extension related to the opening of the Cayman Trough (Gordon and Muehlberger, 1988) produced the discontinuous series of north-south trending structural basins known as the Honduras Depression ( fig.
		The Sico basin is interpreted as a strike-slip basin induced by dextral GFS motion (Finch and Ritchie, 1991).
		E oblique dextral transtensional faults as the northwest boundary fault of the basin.
	www.ig.utexas.edu /research/projects/honduras/VDJAM.htm (11509 words)

	G. truncatulinoides
		In warm subtropical and tropical environments dextral coiling specimens occur as rare components of assemblages under a broader range of physical conditions.
		In the Indian Ocean dextral coiling forms reveal a distinct maximum in relative abundance offset towards lower latitudes compared to the abundance maximum of sinistral coiling G. truncatulinoides.
		The change in relative abundances of dextral and sinistral forms appears to be gradual along environmental gradients (clinal variation).
	www.ngdc.noaa.gov /mgg/geology/hh1996/trunc.html (238 words)

	Sirks - Plasmatic Inheritance
		A striking example of the influence of the plasm in inheritance and as revealed by zoological material, may be found in the studies of Boycott and his collaborators (1930) on sinistrality in the snail Limnaea peregra.
		In this case the first cleavage of the fertilized ovum is "dexiotropic" in dextral snails, i.e., both nuclei with their surrounding masses of plasm shift in both cell halves in clockwise direction, while in sinistral snails the movement is counter-clockwise.
		Conklin concluded from his observations that this difference between dextral and sinistral snails is rooted in the structure of the undivided egg-cell.
	www.bulbnrose.com /Heredity/sirks.html (5003 words)

	Superstition Hills Creep
		Dextral creep events occurred 11 Aug 2005 with an amplitude of 0.5 mm, 20 January 2006 with an amplitude of 0.35 mm, and starting 3 October 2006 with an amplitude of more than 26 mm.
		The columns, following a one line header are: date, GMT hour, mm of dextral slip, and temperature in degrees C.The creep datum is arbitrary and the dextral slip values are given in mm to four decimal places only two of which are significant (0.01 mm).
		The first is a view west showing a then 22 mm dextral crack intersecting the (buried) creep-meter rod, that here passes parallel to the left side of the photo.
	cires.colorado.edu /~bilham/CREEPDATA/SuperstitionCreep.htm (1043 words)

	Presentations
		Described in the context of a dextral transcurrent model of foreland deformation, Laramide structures are consistent with plateau/craton convergence directed toward 054 degrees.
		For the north-south-trending eastern margin of the plateau, these data are consistent with a component of dextral shear between the plateau and craton since the Late Cretaceous.
		Moreover, the fault kinematic and paleomagnetic data are consistent with the hypothesis that dextral plate motions along the western margin of North America influenced deformation far inboard of the North American margin.
	www.beg.utexas.edu /techrvw/abstracts/timw-reno-gsa00.htm (400 words)

	Nat' Academies Press, (NAS Colloquium) Earthquake Prediction: The Scientific Challenge (1996)
		Surficial dextral slip in 1940 was much greater along the southern and central thirds of the fault than along the northern third.
		The gradual, nearly identical, northward decline in dextral slip during both earthquakes is probably a long-term characteristic of the fault, because the northern 15 km of the fault forms the southwestern boundary of a large dilatational stopover.
		Thus, the northward diminutions of dextral slip in 1940 and 1979 are probable manifestations of a gradational tectonic transfer of slip across the dilatational stopover.
	www.nap.edu /books/0309058376/html/46.html (7251 words)

	CONCH-L archives -- October 2002, week 1 (#60)
		Rare abnormal conch specimens coil backward, with the aperture on the left and are sinistral or "lefthanded".
		All definite gastropods apart from the the Paleozoic isostrophic bellerophontids (many of which may not be gastropods at all, but monoplacophorans) do not coil in a true logarithmic spiral, but add another dimenaion by translating the coil along the coiling axis.
		Dextrality or sinistrality is easy to define with shells coiling this way, and such shells are orthostrophic.
	www.listserv.uga.edu /cgi-bin/wa?A2=ind0210a&L=conch-l&F=&S=&P=5856 (656 words)

	Untitled Document
		First-order dextral shear deformation within the TMSSZ is expressed internally by clockwise vertical axis rotations of large areas that were facilitated by second order zones of sinistral shear that separated the blocks.
		The sense of this deflection implies dextral shear and is thus consistent with the conclusion of Dokka and Ross (1995, 1996) regarding the nature of first-order shear along the TMSSZ.
		Across the central Mojave, deformation is generally continuous and the distribution of shear strains across the TMSSZ inferred from vertical axis rotations is asymmetrical with respect to the center of the shear zone; the maximum apparent shear strain occurs south of the center of the TMSSZ (Figure 7).
	www.c4g.lsu.edu /rkd_dir/a.html (7799 words)

	Scott Douglas Anderson Thesis Notice (Site not responding. Last check: 2007-09-15)
		Sinistral transpressional structures comprise a thick, south-verging zone of sinistral-reverse, oblique-slip shear that is bounded to the east by a wide, steeply east- and west-dipping zone of contemporaneous sinistral wrench shear.
		Dextral transpressional structures were observed in a single shear zone in the thesis area, and are overgrown by titanite porphyroblasts with a U-Pb age of 388 ± 4 Ma.
		This shearing is tentatively correlated with a dextral transpressional shear zone exposed further west along the main trace of the BVL.
	meguma.earthsciences.dal.ca /defence/tdn_sda.htm (471 words)

	Structure of Sarstangen, Svalbard
		This regional deformation is related to the opening of the Norwegian-Greenland sea and the dextral motion between Greenland and Svalbard (Harland, 1969).
		The more complex history and orogen parallel motions are consistent with decoupling of the dextral transpressive plate motions into a contractional foreland and a transpressional hinterland (Maher and others, 1995).
		This pattern is most easily explained by a component of dextral motion along the eastern margin of the basin.
	maps.unomaha.edu /Maher/svalbard/sarstangen/default.html (2908 words)

	Explore: Which way do snails coil - to the left or to the right?
		There are shells with either a right (dextral) or a left (sinistral) screw sense (handedness) that reflects the body plan of the animal inside.
		In dextral populations of the fresh water snail Limnea, rare sinistral individuals can be found.
		It was shown in an experiment in 1982 that cell material from the egg of a dextral animal injected into single-celled embryos from sinistral mothers caused them to develop dextrally.
	www.austmus.gov.au /explore/faqs/snails_coil.htm (171 words)

	Journal Contents - Analogue modelling of continental transpression (Site not responding. Last check: 2007-09-15)
		At early stages of deformation two separate zones of en-echelon dextral strike-slip faults form in the brittle layers; (Fig 2A,B; Movies 1661-01, 1661-02) individual fault segments strike at angles between 24° and 30° with respect to the longitudinal borders.
		In plan view dominant offset of faults is dextral, whereas in vertical sections they have a small reverse dip-slip component.
		Reverse faults forming at late stages of deformation near the acute borders of the sheared sand pack are boundary effects caused by “scissoring” of the model (Fig.
	www.virtualexplorer.com.au /2002/7/schreurs/paper1.html (901 words)

	GSA Penrose Conference Report - Kinematics and Geodynamics of Intraplate Dextral Shear in Eastern California and ...
		He also highlighted transient deformation recorded in geodetic data collected across the Basin and Range and suggested that a "megadetachment" at the base of the crust is one possible explanation for these transient deformations.
		The first full day of the conference was a field trip to view evidence for active dextral, normal, and sinistral fault slip, as well as contraction and the kinematics of fault slip transfer in the ECSZ/WLB.
		The conference was a great success because keynote speakers provided stimulating presentations, moderators and recorders admirably kept the discussions going smoothly, and the attendees willingly shared their research and interpretations and contributed thought-provoking questions, comments, and discussions.
	www.geosociety.org /penrose/05pcrpt1.htm (1203 words)

	front2
		A properly interpreted dextrality means the most radical and extreme extremo-dextrality which is utterly devoid of the contamination like counter-sinistral infiltrations of common, vulgar or near vulgar extremo-dextrality, viz infiltration of the socialistoid type.
		That is why dextrality, and primarily extremo-dextrality, became extremely nationalistic at the time - partly on a truly dextral, and partly on a counter-sinistral basis.
		We do not accept sinistral and counter-sinistral nationalism, and dextral, extremo-dextral nationalism contaminated with counter-sinistrality as an anti-differential, anti-integrated and nivellating nationalism, and we, with an utmost effort reject sinistral and extremo-sinistral internationalism, not to speak of its cosmopolitan overgrowths.
	www.geocities.com /ultradextra/ideoeng.html (3050 words)

	CELL BIOLOGY: ON LEFT-RIGHT ASYMMETRY IN SNAILS (Site not responding. Last check: 2007-09-15)
		Another common pond snail, Lymnaea is notable in that both dextral and sinistral forms are found in nature, with sinistral individuals representing up to 2% of the population.
		By contrast, Meshcheryakov and Beloussov (5) attributed the reversal of cleavage pattern between sinistral and dextral species to a reversal -- from clockwise to anti-clockwise -- of the spiral rotation of the daughter micromeres during cytokinesis.
		They observe that in dextrally cleaving Lymnaea embryos, the mitotic spindles are oriented in a clockwise direction (when viewed from the animal pole) during metaphase-anaphase.
	scienceweek.com /2004/sb041008-2.htm (1489 words)

	Quake: N. California Earthquake Potential
		A zone of north-northwesterly trending dextral shear branches from the San Andreas fault system in southern California and north of the Mojave Desert follows the western margin of the Great Basin.
		We suggest that this dextral shear reflects permanent aseismic deformation near the Lassen volcanic center that lies between the two sites and reflects strain release principally of the L-T TZ, but also may release strain from the branch associated with the Honey Lake fault.
		We considered a narrow interpretation of plate tectonic modeling prudent because northeastern California is something like a concealed triple junction partly analogous to the Mendocino triple junction that lies to the west, thus a different tectonic regime may apply.
	quake.wr.usgs.gov /prepare/ncep/northeastern.html (1047 words)

	Pharyngula: Chirality in Euhadra
		Snails are particularly interesting examples because snail shells have an obvious handedness, with either a left-(sinistral) or right-handed (dextral) twist, and that handedness derives from the arrangement of cell divisions very early in development.
		One way to think of it is that the result of a maternal effect mutation is delayed one generation—the snail that has a mutation to cause a dextral twist will have a sinistral shell, but all of her children will be dextral.
		That means that a sinistral snail can mate with a sinistral snail, and their progeny may be dextral, and able to breed with the dextral population.
	scienceblogs.com /pharyngula/2006/04/chirality_in_euhadra.php (1412 words)

	Radar Image for the Study of Landslide Structures in HK
		Affected by the regional N45E strike-slip fault, the subordinate N60E dextral shear planes formed at the direction of P shear plan, the N30E dextral shear plans formed at the direction of R shear plan, and the NW faults formed at the direction of R’ direction.
		R plan exhibits the distribution of sinistral shear set in main fault zone of dextral movement, and exhibits the distribution of dextral shear set in main fault zone of sinistral movement.
		P plan exhibits the distribution of dextral shear set in main fault zone of dextral movement, and exhibits the distribution of sinistral shear set in main fault zone of sinistral movement.
	www.gisdevelopment.net /aars/acrs/1999/ts12/ts12239pf.htm (1996 words)

	Jose Cembrano 's Thesis Notice (Site not responding. Last check: 2007-09-15)
		S), Late Cenozoic ductile to brittle dextral strike-slip deformation along northeast striking shear zones was continuous from syntectonic pluton emplacement at 10 Ma, to low temperature, solid-state deformation at ca.
		Ar data from mylonites and undeformed rocks from the five transects suggest that dextral strike-slip and contractional deformation occurred at nearly the same time but within different structural domains along and across the orogen.
		The long-term dextral transpressional regime appears to be driven by oblique subduction.
	meguma.earthsciences.dal.ca /defence/tdn_josec.htm (558 words)

	(Geology of Iceland)
		The current offset between the spreading axes of the NRZ and WRZ and the overall plate boundary defined by the Reykjanes and Kolbeinsey Ridges is 100-150 km (Fig.
		The Icelandic rift system is connected to the oceanic spreading ridges via the dextral Tjörnes Fracture zone linking the NRZ with the Kolbeinsey Ridge and the sinistral South Iceland Fracture Zone and Reykjanes Peninsula, linking the ERZ to the Reykjanes Ridge.
		The dextral fault movement of this event produced severe ground motion and surface rupturing.
	www.norvol.hi.is /html/geol/intro/geo3.html (759 words)

	IngentaConnect The Sticklepath-Lustleigh fault zone: Tertiary sinistral reactiva... (Site not responding. Last check: 2007-09-15)
		Dextral strike-slip movement on the Sticklepath–Lustleigh fault zone (SLFZ) is indicated by displacements of ?Permian and older rocks.
		Previous authors have inferred that the main dextral movement which caused these displacements was post- Permian and, noting the presence of small Tertiary pull-apart basins along the fault zone, probably of Tertiary age.
		Extensional reactivation of this thrust led to rapid Permo-Triassic subsidence in the Crediton Trough and a dextrally offset neighbour, the Hatherleigh outlier.
	api.ingentaconnect.com /content/geol/jgs/1986/00000143/00000003/14330447 (264 words)

	Large river offsets and Plio-Quaternary dextral slip rate on the Red River fault (Yunnan, China)
		We attempt to assess the Plio-Quaternary dextral slip rate on the Red River fault (RRF) by restoring large river offsets and searching for the largest, plausible one.
		The lack of correlation between the apparent offsets and the lengths of the rivers upstream from the fault suggests either that the drainage system was in large part established prior to the onset of dextral slip along the fault or that frequent captures have occurred.
		Since dextral motion is likely to have started around 5 Myr, the most probable average Plio-Quaternary slip rate on the fault is of order of 5 mm/yr.
	www.agu.org /pubs/crossref/2001/2000JB900135.shtml (500 words)

	Quaternary Faulting in Kutch
		A parallel structure occurs north of Bharodia and is referred to herein as the monoclines near Bharodia.
		We interpret the monoclines as mainly the result of decimeter-scale dextral faulting, where the fault plane flattens upward into a flower structure that creates the thrust scarp.
		One of two dextral faults in the central section of the monocline north of Bharodia, looking north.
	www.geohaz.com /kutch.htm (2244 words)

	Shell
		Lanistes who have a sinistral shell (shell opening at the left), although there are reports of sinistral animals in the other genera (see the literature: CAZZANIGA, N. and ESTEBENET, A. and recently the author of this website discovered a sinistral Marisa cornuarietis snail in his aquarium.
		The Lanistes snail has a sinistral shell, but the body is dextral.
		The evolution of a dextral to a hyperstrophic sinistral snail is showed in the movie below (at the right).
	www.applesnail.net /content/anatomy/shell.php (1384 words)

	ILSG 1999 abstract
		This strike is consistent with the dextral transpression model.
		One exception to this is in the area of Shoal Lake where the strike changes to approximately 045, creating an overall S-like geometry with a map pattern analogous to a dextral shear sense indicator.
		The same shear sense is observed at a smaller scale within the conglomerate clasts that often form sigma and delta dextral shear sense indicators on the sub-horizontal plane.
	www.uwm.edu /~dyanna/ILSG1999.html (772 words)

Try your search on: Qwika (all wikis)