bluuebunny/crossref_metadata_2025 huggingface dataset:
Age of high-grade gneisses south of Grand Lake, Newfoundland
Authors: Currie K. L. , Van Breeman O. , Hunt P. A. , Van Berkel J. T.
Published: September 2014

Crystalline rocks of the Steel Mountain Subzone of the Humber Zone in southwest Newfoundland give an age for granulite-grade metamorphism of 1498+9/-8 Ma, similar to ages from the Long Range inlier and northwestern Cape Breton Island. Peralkaline leucogranite was emplaced at 608 ± 4 Ma. The emplacement of anorthosite-gabbro complexes and amphibolite-grade metamorphism took place between these dates. The southern part of the Dunnage Zone (Central Gneiss Subzone), in contact with the Steel Mountain Subzone at the Long Range Fault, lacks Precambrian crystalline rocks, but was intruded by charnockitic plutons and metamorphosed to granulite facies at 460 ±10 Ma. This subzone was exhumed before 435 Ma. In the Meelpaeg Subzone of the Gander Zone, which is in contact with the Central Gneiss Subzone along the Victoria River Fault, the oldest intrusive component of a granoblastic migmatitic gneiss was emplaced at 418 ± 4 Ma.

These data demonstrate that both the Long Range and Victoria River faults form major tectonic boundaries. Subzones appear to have been thrust westward in Silurian or later time.

RÉSUMÉ

Les roches cristallines de la sous-zone du mont Steel, dans la zone de Humber du sud-ouest de Terre-Neuve, ont donné des âges de 1498+9/-8 Ma pour le métamorphisme de haul grade, similaires à ceux de la boutonnière de Long Range et du nord de l'ile-du-Cap-Breton. Un leucogranite peralcalin s'est mis en place à 608 ± 4 Ma. L'intrusion des complexes à anorthosite-gabbro et le métamorphisme au faciès amphibolite se sont produits entre ces deux évènements. La partie sud de la zone de Dunnage (sous-zone de gneiss centrale), en contact avec la sous-zone du mont Steel a la faille de Long Range, ne contient pas de roches cristallines précambriennes mais à 616 recouped par des plutons charnockitiques et à 616 métamorphisée au faciès granulite à 460 ± 10 Ma. Cette sous-zone a été exhumge avant 435 Ma. Dans la sous-zone Mulpaeg de la zone de Gander, qui est mise en contact avec la sous-zone de gneiss centrale par la faille de la rivière Victoria, la phase intrusive la plus ancienne d'un gneiss migmatitique et granoblastique s'est mise en place à 418 ± 4 Ma.

Ces données démontrent que les failles de Long Range et de la rivière Victoria sont des frontières tectoniques majeures. Les sous-zones semblent avoir subi un chevauchement vers l'ouest au plus tard au Silurien.

[Traduit par le journal]
A note on reported plant fossils from the Flume Ridge area of southwestern New Brunswick
Authors: Fyffe L. R. , Miller R. F.
Published: September 2014

Reports of geological surveys undertaken during the latter part of the last century state that plant fragments were recovered from pre-Carboniferous rocks of the Flume Ridge area in Charlotte County, New Brunswick. An attempt was made to confirm the presence of these plant remains in order to provide age constraints on the otherwise unfossiliferous Digdeguash, Sand Brook, and Flume Ridge formations. Re-examination of a reported locality on Cox Brook and of an original specimen stored at the New Brunswick Museum in Saint John suggests that material identified as "Lepidostrobus" is actually a spotted slate chip incorporated in a wacke bed. The recognized inorganic nature of die supposed fossils precludes assignment of specific ages to the pre-Carboniferous rocks underlying a large tract of southwestern New Brunswick.

RÉSUMÉ

Les rapports des levés géologiques entrepris vers la fin du siècle dernier mentionnent que des fragments de plantes furent trouvés dans des roches pré-Carbonifère de la région de Flume Ridge du comté de Charlotte, Nouveau-Brunswick. Une tentative a été faite de confirmer la présence de ces restes de plantes afin de fournir des données sur l'âge des formations, par ailleurs non fossiliferes, de Digdeguash, Sand Brook el Flume Ridge. Les réexamens d'un site mentionné le long du ruisseau Cox et d'un échantillon original conservé au Musée du Nouveau-Brunswick à Saint-Jean suggère que le matériel identifié comme "Lepidostrobus" est en fait un fragment de shale tacheté dans un lit de wacke. La nature inorganique reconnue des supposés fossile empêche l'attribution d'âges spécifiques aux roches pré-Carbonifère sous-jacentes à une grande superficie du sud-est du Nouveau-Brunswick.

[Traduit par le journal]
Coastal Environments of the Maritime Provinces
Authors: Owens E. H. , Bowen A. J.
Published: September 2014

This review of the coastal process and morphology characteristics of the Maritime Provinces provides a general summary of existing information and data for an area that has a wide variety of shoreline types, geologic units, and oceanographic conditions. The general coastal trends of the area are controlled by the regional southwesterly-northeasterly trending structures associated with the Appalachian system. Superimposed on this basic geologic framework, the contrasting shoreline types result from the high degree of variability in local geology, relief, wave-energy levels, tidal range and sediment availability. This variability provides the basis for discussion of the shorelines of the Maritime Provinces. Twenty-two distinct coastal environments are systematically defined and described.
Depositional Environments and Sediments in the Coastal Zone of Prince Edward Island, Canada
Authors: Bartlett Grant A.
Published: September 2014

Prince Edward Island has an area of 5700 km2, with a length of approximately 217 km and an average width of 27 km. Numerous coastal indentations account for a total coastline of over 1,770 km. Shallow bays and estuaries cut deeply into the landmass and nearly dissect it in several places. Man has established his major communities, industries, and recreational activities along the coastline and is being drawn there in increasing numbers, thereby placing undue pressure on the very environmental qualities which formed the original attraction.

The estuaries produce large quantities of organic materials, and act as sediment traps and reservoirs for nutrients and chemicals. The processes of trapping, concentrating, producing and recycling sediments are of first order importance.

Sediments in the estuaries and lagoons range from clay to coarse sand and gravel. They are contributed by marginal, internal and external sources. Sediment accumulation averages 0.4 cm/year. Fluvial waters transport and contribute the majority of the sediments to these environments. Tidal flow contributes to the resuspension and redistribution of river-borne sediments. Agglomeration, flocculation and deflocculation occurring in these estuaries have important affects on siltation and pollutant concentration. Organic constituents in the sediments are derived from pelagic, epi- and infaunas. The inorganic constituents are derived from a variety of sources.

Concentrations of suspended particulate matter decrease from about 180 mg/l in upper estuaries to less than 3 mg/l in the lower estuary-lagoon complex. The organic matter content is highest (-3 to 5%) in fine-grained sediments. Heavy metals such as Cu, Pb and Zn are strongly associated with organic matter.

River flow and the flood and ebb of tidal currents are the most obvious water motions in these environments. However, strong winds cause turbulence in shallow (< 5 m) waters. This turbulence initiates resuspension of previously deposited organic and inorganic materials. Depending upon the relative directions of wind and tide, winds may cause an increase or decrease in surface current velocities.
Airphoto Lineaments in the Caledonia Area of Southern New Brunswick
Authors: Naing Win , Lajtai E. Z.
Published: September 2014

A system of photogeologic interpretation has been applied on a regional scale in the Caledonia area of New Brunswick, Canada, The orientation of about 700 photolineaments has been measured and their distribution analysed. A statistical partitioning technique applied to the whole region produced six major trends with the strongest trends occurring at 097o±7o, 165o±6o and 141o±9o . None of the strong trends coincides with the orientation of major faults in the area. Detailed examination of structural domains suggests the presence of more than six lineament trends. Correlation of trends from domain to domain is difficult and the genetic significance of lineaments in view of the scarcity of ground information remains in doubt.
Observations on Oceanography and Sedimentation at Pangnirtung Fiord, Baffin Island
Authors: Gilbert R.
Published: September 2014

Pangnirtung Fiord is a glacial trough draining the southwest portion of Penny Icecap, Baffin Island. Sills associated with riegels divide the fiord into four basins. Despite a large inflow of sediment from streams draining the glaciers and Penny Icecap, glacio-marine sediments have been deposited in sufficient thickness to mask glacial features only in the central portion of the fiord. A major trench in the fiord floor is believed to result from erosion by turbidity currents. A shallow sill (12 to 22 m below mean tide level) at the mouth of the fiord, a large tidal range (up to 6.7 m), and moderate fresh water inflow strongly influence circulation and stability of fiord water. Replacement of bottom water occurs frequently or continuously during the year and helps to determine the distribution of sediment. The oxygen~rich bottom water supports a large benthic fauna which severley bioturbates the sediments making them useless for the interpretation of Holocene events in the region.
Lamination Sampling Technique for Unconsolidated Sediments
Authors: Leatherman Stephen P. , Williams Allan T.
Published: September 2014

An adjustable shop wrench to which thin plexiglass squares were mounted as jaws was used to sample unconsolidated sediments. The jaw opening could be set so as to match perfectly the thickness of the lamina to be sampled. Samples could be taken with little risk of contamination from adjacent strata and could be inspected before acceptance because of the transparency of the plexiglass slides.
Surface- and deep-water hydrography and meltwater events in the mid-latitude North Atlantic Ocean over the past 160,000 years
Authors: Park Myong-Ho , Kiefer Thorsten , Zahn Rainer
Published: September 2014

An investigation involving stable oxygen and carbon isotopes on core Ml5612 from the Mid-Atlantic Ridge (445N, 26°W) shows that distinct negative δIRO anomalies punctuate the plank tonic isotope records and correlate with the ice-raftcd detritus (IRD) events. Within most IRD layers, detntal carbonate contributes between 1 and 13% and supports the contention that the layers are the southern equivalents of the northern North Atlantic Ocean's Heinnch events Anomalies are strongest for the Neogloboquadrina pachyderma (sinistral coiling) isotope record. Systematic changes in the δIRO offset between Globigerina bulloides and Globorotalia inflata signify variations in the mid-latitude thermocline structure. In conjunction with negative benthic δIRC anomalies, the data document a stronger contribution of an IRO-depleted, nutrient-rich water mass during the Heinrich events. The δIRC amplitude of >l% between 25 and 57 ka indicates changes between northern-source (North Atlantic Deep Water) and southern-source (Antarctic Bottom Water) water masses at this site. The Heinrich layers in the mid-latitude core arc correlative with those from a core off Portugal. This synchronicity may have resulted from common changes in a North Atlantic thermohaline switch.

RÉSUMÉ

Une étude touchanl les isotopes lourds d'oxyéene ct de carbone du noyau M156I2 dc la ride médio-allantique (44=nord. 26° ouest) révéle que des anomalies negatives distinctes de δIRO ponctuent les enregistrements d'isotopes planctoniques et les rapprochent avec des phenomènes d'alimcntation en débris glaciels. La contribution du carbonate délrilique varie entre 1 et 13% a l'inteneur de la majorité des couches de débris glaciels, ce qui conforte la théorie que les couches constituent les équivalents méndionaux des phènoménes de Heinrich septentnonaux de I'Atlantique Nord Les anomalies sont les plus prononcées dans le cas de 1'enregislrcmcnt d'isotopes de Neogloboquadrina pachyderma (enroulement sénestre). Les changements systématiques dans le décalage de δIRO entre le Globigerina bulloides et le Globorotalia inflata témoignent de variations dans la structure de la thermocline de latitude moyenne. Conjointement à des anomalies de δIRO benthiques négatives, les données documenient une contribution plus marquée d'une masse d'eau riche en éléments nutrilifs et a faible tcneur en IRO pendant les phènomèncs de Heinrich. L'amplitude de δIRO de >l% entre 25 el 57 Ka révélent des changements entre les masses d'eau d'origme septentrionale (eaux profondes de l'Atlantique Nord) et d'origine méndronale (eaux dc fond de l'Antartique) en cet emplacement. Les couches de Heinrich du noyau dc latitude moyenne se rapprochent de celles d'un noyau au large du Portugal. Cette synchronicité pourrait découler de changements communs dans une substitution thermohaline de l'Allantique Nord

Traduit par la rédaction
A re-interpretation of the "Bateman Brook Metamorphic Suite", Cape Breton Highlands, Nova Scotia, as sheared, fault-bounded blocks of other units
Authors: McMullen David W.A. , Barr Sandra M. , Raeside Robert P.
Published: September 2014

The Bateman Brook Metamorphic Suite, as previously defined, is the westernmost unit of the Bras d'Or terrene in the central Cape Breton Highlands. It outcrops along the Eastern Highlands Shear Zone, the contact between the Bras d'Or terrane and the Aspy terrane to the northwest. The Bateman Brook unit has been reported to contain a wide range of lithologies, and contacts with adjacent units are mainly faulted.

Re-examination of rocks from the Bateman Brook Metamorphic Suite shows it to consist of semipelitic to psammitic schist, banded mafic gneiss, and foliated, dioritic, mafic gneiss. Rocks exhibit two major shear fabrics, an early intensely foliated and lineated fabric indicative of shear at high metamorphic grade, and a later mylonitic fabric indicative of shear at lower grade.

As a result of this study, it is recommended that the name Bateman Brook Metamorphic Suite be abandoned. The southern part of the suite is re-assigned to the McMillan Flowage Formation of the Bras d'Or terrane. The central part is interpreted to include rocks of both the Kathy Road Dioritic Suite and the McMillan Flowage Formation. Most of the northern part is re-assigned to the Jumping Brook Metamorphic Suite of the Aspy terrane.

RÉSUMÉ

La suite métamorphique de Bateman Brook, telle que définie ameiieurement, est l'unité la plus occidentale du terrain de Bras d'Or dans le centre des hautes-terres du Cap-Breton. Elle affleure le long de la zone de cisaillement de Eastern Highlands, le contact entre le terrain de Bras d'Or et le terrain d'Aspy au nord-ouest. L'unité de Bateman Brook à été décrite comme comprenant une grande variété de lithologies et les contacts avec les unités adjacentes sont principalement faillés.

Un réexamen de roches provenant de la suite métamorphique de Bateman Brook montre qu'elle consiste en schiste semi-politique à psammitique, en gneiss mafique rubané et en gneiss mafique dioritique et folié. Les roches montrent deux fabriques de cisaillement majeures, une fabriques de foliation et de linéation précoce fortement développée indiquant un cisaillement à haut grade métamorphique et une fabrique mylonitique plus tardive indicative d'un cisaillement à plus faible grade.

Comme résultat de cette étude, il est recommandé que le terme de suite métamorphique de Bateman Brook soit abandonné La partie sud de la suite est réassignéle à la Formation de McMillan Flowage du terrain de Bras d'Or. La partie cent rale est interprétée comme incluant des roches appartenant à la suite dioritique de Kathy Road et à la Formation de McMillan Flowage. La plupart de la partie du nord est réassignée à la suite métamorphique de Jumping Brook du terrain d'Avalon.

[Traduit par la rédaction]
The eocrinoid Ascocystites Barrande (Echinodermata, Blastozoa) from the Middle Ordovician of central Portugal, with comments on the stratigraphy of the Brejo Fundeiro Formation
Authors: Young Timothy P. , Donovan Stephen K.
Published: September 2014

The eocrinoid Ascocystites is recorded from the Middle Ordovician (Lower Llanvirn) Brejo Fundeiro Formation of the Domes region, central Portugal. The Brejo Fundeiro Formation is a sequence of mudrocks overlying the "Armorican Quartzite" (Lower Ordovician, Arenig). Ascocystites was found in a decalcified concretion from a horizon close to the base of the formation. This genus has previously been recorded only from the Middle Ordovician of Bohemia and the Armorican Massif. All occurrences lie within the Gondwanan West European Platform.

RÉSUMÉ

L'éocrinoide Ascocystites est reconnu dans la Formation de Brejo Fundeiro de l'Ordovicien moyen (Llanvirn inférieur) de la région de Dames, dans le centre du Portugal. La Formation de Brejo Fundeiro est une séquence de mudrocks recouvrant la "Quartzite Armoricaine" (Ordovicien inférieur, Arenig). Ascocystites fut trouvé dans une concrétion décalcifiée d'un horizon près de la base de la formation. Ce genre était auparavant connu seulement de l'Ordovicien moyen de la Bohème et du massif armoricain. Toutes les occurences se situent dans la plate-forme de Gondwana de l'Europe de l'ouest.

[Traduit par la rédaction]
Allocyclic and thermochronological constraints on the evolution of the Maritimes Basin of eastern Canada
Authors: Ryan R. J. , Zentili M.
Published: September 2014

The tectonic and metallogenetic evolution of the Maritimes Basin is constrained by its thermochronology, structure, and stratigraphy. Allocyclic sedimentary deposition occurred within the basin and reflects the shifts in tectonic subsidence from local rapid events to regional slower events. Apatite thermochronology combined with vitrinite reflectance data suggest that an additional l.5 to 4 km of strata were deposited prior to 280 Ma and subsequently eroded. The organic maturation and the apatite fission track modelling indicate that the exhumation took place from 280 to 200 Ma. The thermochronology data arc consistent with a paleogeothermal gradient of approximately 25°C/km. The structure of the Maritimes Basin and the paleo-geographic reconstructions based on paleomagnetics and sediment dispersal studies suggest that the basin developed as a continental wrench-fault basin. The exhumation of the basin may be the result of pre-rift bulging or due to the erosion of strata deposited above sea level following a waning in the sediment supply into the basin. The timing of basin-brine expulsion events which have been hypothesized to explain Pb-Zn-Ba deposits in the basin are constrained to pre 280 Ma, prior to the onset of exhumation. Redbed Cu mineralization can be explained as being related to a period of reddening of the sandstones of the basin during the exhumation of the strata.

RÉSUMÉ

L'évolution tectonique et métallogénique du bassin des Maritimes est circonscrite par sa thermochronologie, sa structure et sa stratigraphic. La déposition sédimentaire allocyclique dans le bassin reflete les changements de subsidence tectonique, passant d'événements locaux rapides à des éveénements régionaux plus lents. La thermochronologie de L’apatite combinée aux données du pouvoir réflecteur de la vitrinite suggère que de 1,5 à 4 km additionnels de couches ont été déposés avant 280 Ma pour être ensuite érodés. La maturation organique et la modélisation des traces de fission dans L’apatite indiquent que la denudation a eu lieu de 280 à 200 Ma. Les données thermochronologiques sont en accord avec un gradient paléogeothcrmique d'environ 25°C/km. La structure du bassin des Maritimes et les reconstructions paléogeographiques basées sur des études paléomagnetiques et de dispersion des sédiments suggèrent que le bassin s'est développé comme un bassin continental lie à une faille de décrochement. La dénudation du bassin pourrait être liée à un bombement pré-rift ou à l’érosion des couches déposées au-dessus du niveau de la mer après le declin d'apports sédimentaires dans le bassin. L’expulsion des saumures du bassin qui pourrait être à L’origine des minéralisations en Pb-Zn-Ba dans le bassin à eu lieu il y a du moins 280 Ma, avant le début dc la dénudation. L'explication des minéralisations cupriferes dans les couches rouges peut-être liée à une période de rubéfaction des grés du bassin lors de l’érosion des couches.

[Traduit par la rédaction]
The opaque mineralogy of metasedimentary rocks of the Meguma Group, Beaverbank-Rawdon area, Nova Scotia
Authors: Haysom S. J. , Horne R. J. , Pe-Piper G.
Published: September 2014

Opaque mineralogy of a representative cross-section of deformed and metamorphosed turbiditic slate and metasandstone of the Meguma Group has been investigated optically and by electron microprobe. A strong stratigraphic control over the presence and abundance of certain opaque minerals is recognized, which may prove useful for environmental evaluation such as acid drainage potential. Abundant pyrite and pyrrhotite in the lower Halifax Formation reflect concentration of early diagenetic pyrite resulting from the reduction of seawater sulphate under anoxic conditions. Magnetite is restricted to the Goldenville Formation. Dmcnitc and rutile occur throughout the succession, and minor chalcopyrite, arsenopyrite, covellite, hematite and glaucodot were also noted.

Pyrrhotite and ilmenitc, as well as spcssartine, chlorite and chloritoid porphyroblasts, developed during pro-grade metamorphism before and/or during cleavage formation, which also resulted in removal of early diagenetic pyrite. Later pyrite formed by replacement or immobilization of pyrrhotite during retrograde metamorphism. Colloform pyrite, arsenopyrite and chalcopyrite are the youngest mineral phases.

R&3xC9;SUMÉ

On a étudie la structure méniralogique opaque d'un échantillon représentatif de métagrès et d'ardoisc turbiditique déformés et mélamorphisés du groupe de Meguma, optiquement ainsi qu'è l'aide d'une microsonde électronique. On a ainsi reconnu un contrdle stratigraphique prononcé sur la présence et l'abondance de certains minéraux opaques, ce qui pourrait s'avérer utile pour une évaluation environnementale, comme celle du potentiel de drainage acide. Les quantités abondantes de pyrite et de pyrrhotine dans la partie inférieure de la Formation d'Halifax témoignent d'une concentration de pyrite diagcénétique précoce provenant de la réduction du sulfate d'eau salié dans des conditions anoxiques. La magnétite se limite à la Formation de Goldenville. On relève la présence d'ilménite et de rutile partout dans la succession, en plus de petites quantités de chalcopyrite, d'arsénopyrite, de covellite, d'hématitc et de glaucodot.

La pyrrhotine et l'ilménite, tout comme la spcssartine, la chlorite et les porphyroblastes chloritoldes, sont apparus au cours d'un métamorphisme progradc avant ou pendant la formation du clivage, qui a provoqué en plus un retrait de la pyrite diagénétique précoce. La pyrite ultérieure s'est formic par remplacement ou remobilisation de la pyrrhotine au cours d'un rétrométamorphisme. La pyrite colloforme, l'arsénopyrite et la chalcopyrite représentent les phases minérales les plus récentes.

[Traduit par la rédaction]
Late-glacial marine invertebrate macrofossils from Point Lepreau, New Brunswick
Authors: Miller Randall F. , McGovern Jeffrey H.
Published: September 2014

A late-glacial shell fauna from Point Lepreau, New Brunswick produced a radiocarbon date of 13,500 years B.P. The assemblage contained well-preserved subarctic to boreal molluscs and barnacles typical of late Pleistocene marine deposits from the region. Rare specimens of sea urchin, crab and brittlestar may be the oldest recorded occurrence of these animals in the late-glacial Bay of Fundy. The assemblage fits into a previously defined Zone 3, late-glacial marine invertebrate assemblage in the Bay of Fundy-Gulf of Maine region, characterized as a Diverse Arctic assemblage.

RÉSUMÉ

La datation par le radiocarbone a situé à 13 500 ans BP une faune invertébéie tardiglaciaire de la pointe Lepreau, ou Nouveau-Brunswick. L'assemblage renferme des mollusques et des bernacles subarctiques à boréaux bien conservés caractéristiques des dépôts marins du Pléistocène tardif de la région. Les spècimens rares d'oursins, de crabes et d'ophiures pourraient constituer les manifestations les plus anciennes de la présence de ces animaux relevées dans la région tardiglaciaire de la baie de Fundy. L'assemblage se situé à l’intérieur de l'assemblage d'invertébrés marins tardiglaciaires de la zone 3 antérieurement défini dans la région de la baie de Fundy et du golfe du Maine, caractérisé en tant qu'assemblage arctique hétéiogene.

[Traduit par la rédaction]
A camerate crinoid from the Upper Silurian (Ludlow) Moydart Formation of Nova Scotia, Canada
Authors: Donovan Stephen K. , Pickerill Ron K.
Published: September 2014

Well-preserved fossil echinodcrms are uncommon in the Arisaig Group (early Silurian to early Devonian) of Nova Scotia. Although not preserving sufficient detail to enable specific identification, a crinoid, monobathrid camerate gen. et sp. indet. from the Moydart Formation (late Silurian, late Ludlow), shows the following features: a long, heteromorphic (N212) column of circular section and with convex nodals; a broad, conical dorsal cup with broad, high radials; fixed, uniserial arms which branch twice; 20 long, free arms that are uniserial most proximally, but are otherwise biserial; and numerous, elongate, blade-like pinnules. The column of this species differentiates it from a second taxon commonly preserved perpendicular to bedding in the Moydart Formation. Thus, while one species in this formation is preserved autochthonously in life position, another forms a crinoid lagersiatte and coquinas of more complete specimens, but is, at best, parautochthonous.

RÉSUMÉ

Les échinodermes fossiles bien conservés sont rares dans le Groupe d'Arisaig (Silurien inférieur au Dévonien inférieur) de la Nouvelle-Écosse. Bien qu'il n'ait pas conservé suffisamment de details pour permettre une identification précise, un erinolde à chambres monobathride de genre et espèce inditérminés provenant de la Formation Moydart (Silurien supérieur, Ludlow supérieur) présente ces caractéristiques : longue colonne hétéromorphe (N212) d'une section circulaire avec nodales convexes; vaste calice dorsal conique avec rayons endosquelertiques élevés et étendus, et bras unisériés à deux niveaux de ramifications; 20 longs bras libres qui sont unisériés proximalcment, mais qui sont bisériés plus loin; ainsi que maintes pinnules oblongues en fer de lance. La colonne de cette espèce la différencie d'un deuxième taxon ordinairement conservé perpendiculairement au litage dans la Formation Moydart. Ainsi, même si une espèce de cette formation est conservée de fa÷on autochtone dans une position vitale, une autre peut être formée de lagersiatte crinoides et de coquillages cunéiformes de specimens plus complets, mais, au mieux, subautochtones.

[Traduit par la rédaction]
D/H in beetle chitin from the late-glacial Lismore site in eastern Canada: supplementary note
Authors: Miller Randall F.
Published: September 2014

D/H (Deuterium-Hydrogen) analysis of chitin from a late-glacial site in eastern Canada demonstrates promising results and lends support to other evidence for the Killarney Oscillation.

RÉSUMÉ

L'analyse du rapport D/H (Dentérium-Hydrogène) de chitine provenant d'un site tardi-glaciaire dans l'Est du Canada démontre des résultats prometteurs et vient appuyer d'autres données pour l'oscillation de Killarney.

[Traduit par la rédaction]
A note on the geochemistry of some shales from the Bathurst-Newcastle Mining Camp, northern New Brunswick
Authors: Fyffe L. R.
Published: September 2014

Ordovician volcanic and sedimentary rocks of the Tetagouche Group in the Bathurst-Newcastle area of northern New Brunswick are host to numerous stratiform sulphide deposits that appear restricted to certain stratigraphic horizons. As a mapping aid in these complexly deformed rocks, shales from some of the recently established formational divisions within the Tetagouche Group were analyzed to determine if they possess specific geochemical signatures that could be used for correlative purposes. Grey and black shales from the Patrick Brook Formation in the lower part of the Tetagouche Group of northern New Brunswick do not exhibit the enrichment in V and U that is characteristic of black shale from the Bright Eye Brook Formation of west-central New Brunswick. Black cherty shales from the Boucher Brook Formation in the upper part of the Tetagouche Group and from the Pointe Verte Formation of the Fournier Group are mildly enriched in V and U. Grey shale from the Boucher Brook Formation is enriched in Mn, Zn, Ni, Cu, and Co, and displays a positive Cc anomaly and elevated values of light rare-earth elements compared to average shale. This variation in geochemistry reflects a change in depositions] conditions from anoxic to oxic between the early and mid-Ordovician and accounts for the abundance of preserved sulphide deposits in the lower part of the Tetagouche Group.

RÉSUMÉ

Les roches volcaniques et séimentaires du Groupe de Tetagouche dans la région de Bathurst-Newcastle, dans le nord du Nouveau-Brunswick, sont hôtes de nombreux dépôts de sulfures stratiformes qui scmblent être confines à certains niveaux stratigraphiques. Dans le but de faciliter la cartographic de ces roches à structure complexe, des schistes argileux, provenant des formations recemment établies dans le Groupe de Tetagouche, furent analysés afin de déterminer s'ils possedent des signatures géochimiques qui pourraient être utilisées a des fins de correlation. Les schistes argileux gris et noirs de la Formation de Patrick Brook de la partie inférieure du Groupe de Tetagouche du nord du Nouveau-Brunswick ne montrent pas l'enrichissement en V et U qui est caractéristique du shale noir de la Formation de Bright Eye Brook du centre-ouest du Nouveau-Brunswick. Les schistes argileux noirs et cherteux de la Formation de Boucher Brook de la partie supérieure du Groupe de Tetagouche et de la Formation de Pointe-Verte du Groupe de Fournier sont légèrement enrichis en V et U. Le schiste argileux gris de la Formation de Boucher Brook est enrichi en Mn, Zn, Ni, Cu et Co, et montre une anomalie positive en Ce et des valeurs élevées de terres rares légères par rapport au schiste argileux moyen. Cette variation de la composition géochimique reflete un changement de conditions de dépôt d'anoxique à oxygénées entre L'Ordovicien précoce et le moyen et explique l'abondance des dépôts de sulfures préserves dans la partie inférieure du Groupe de Tetagouche.

[Traduit par la rédaction]
Isocrinid crinoids from the late Cenozoic of Jamaica
Authors: Donovan Stephen K.
Published: September 2014

Eight species of isocrinines have been documented from the Lower Cretaceous to Pleistocene of Jamaica. New finds include a second specimen of a Miocene species from central north Jamaica, previously regarded as Diplocrinus sp. but reclassified as Teliocrmus? sp. herein. Extant Teliocrinus is limited to the Indian Ocean, although Miocene specimens have been recorded from Japan, indicating a wider distribution during the Neogene. One locality in the early Pleistocene Manchioncal Formation of eastern Jamaica has yielded three species of isocrinine, Cenocrinus asterius (Linné), Diplocrinus maclearanus (Thomson) and Neocrinus decorus Thomson. These occur in association with the bourgueticrinine Democrinus sp. or Monachocrinus sp. These taxa are all extant and suggest a minimum depositional depth for the Manchioneal Formation at this locality of about 180 m. This early Pleistocene fauna represents the most diverse assemblage of fossil crinoids documented from the Antillean region.

RÉSUMÉ

Huit espèces d'isocrinines de la période du Cretacé infeérieur au Pleéstocene de la Jamatque ont été documentés. Les nouvelles découvertes comprennent un deuxième spécimen d'unc espèce du Miocène du nord central de la Jamaique, auparevant considered comme l'espèce Diplocrinus, mais reclassified en tant que Teliocrinus? aux présentes. Le Teliocrinus existant est limité à l'océan Indien, même si on a relevé des spécimens du Miocene au Japon, ce qui est reVilateur d'une distribution plus répandue au cours du Néogène. Un emplacement de la formation de Manchioneal du Pleéstocene inférieur dans L'est de la Jamalque a livré trois espèces d'isocrinines : le Cenocrinus asterius (Linné), le Diplocrinus maclearanus (Thomson) et le Neocrinus decorus (Thomson). Ceux-ci sont présents en association avec les bourgueticrinines Democrinus ou Monachocrinus. Ces taxons sont tous existants et ils permettent de supposer que la formation de Manchioneal aurait une profondeur minimale de sedimentation d'environ 180 m à cet endroit. Cette faunc du Pleéstocene inférieur représente l'assemblage le plus diversifé de crinoides fossiles documentés dans la région des Antilles.

[Traduit par la rédaction]
Eochelysipus horni, a new vertebrate trace fossil from the Tournaisian Horton Bluff Formation, Nova Scotia
Authors: Mossman David J. , Grantham Robert G.
Published: September 2014

A new vertebrate trackway is described from the coastal-marine sequence at Blue Beach and Horton Bluff, Nova Scotia. Eochelysipus horni ichnogen. et ichnosp. nov., features a wide trackway, low pace angle, elongate anteriorly oriented digital scrape marks, hands slightly interior to the trackway, and five-toed hind limbs. It is probably that of a parareptile and a close ancestral form to turtles; the trackway was impressed on firm mud. Present nearby at the same stratigraphic level is a topotype of Peratodactylopus bishopi ichnogen. et ichnosp. nov., a trackway of a captorhinomorph reptile discovered here in 1974. Elsewhere at Blue Beach a large enigmatic trackway (Baropezia ichnosp.?) attests to the wide range of tetrapod morphologies present in these Tournaisian sediments. The assemblage of fossils, palaeoichnological and osteological alike, highlight the importance of this locality for revealing details of Earth's early air breathing community at the Devonian-Mississippian transition.
Mercury concentrations in the bedrock of southwestern Nova Scotia: a reconnaissance study
Authors: Page Krista D. , Murphy J. Brendan
Published: September 2014

Kejimkujik National Park in southwestern Nova Scotia contains an ecosystem affected by Hg contamination. Although the source of the Hg has been regarded as anthropogenic, it is unclear what role the underlying geology may play. In order to assess the possibility that Hg contamination might be, at least in part, from the underlying bedrock, we present Hg analyses of biotite-rich granitoid, muscovite-rich granitoid, and maﬁc rocks from the area in order to complement previous regional studies. A correlation matrix reveals signiﬁcant positive correlations between Hg, Mg, Fe, and Ca, as well as with the trace elements Co, Fe, Ga, Mg, Mn, Mo, S, Sr, Te , and V. The highest Hg concentrations in the granitoid rocks are in samples from the Boot Lake Granodiorite, which contains up to 32% biotite. The muscovite-rich granitoid rocks yield consistently low concentrations of Hg. Taken together, we suggest a direct relationship between anomalous Hg concentrations in bedrock and the modal abundance of biotite. This study, together with previous work which reports correlations between high Hg concentrations in ﬁsh and areas that are underlain by biotite-rich granitoid rocks, suggests that the potential role of biotite-rich rocks as a contributor to the contaminated ecosystem at Kejimkujik National Park requires further investigation.

RÉSUMÉ

Le parc national Kejimkujik dans le Sud-Ouest de la Nouvelle-Écosse abrite un écosystème affecté par une contamination de Hg. Même si on considère que le Hg provient d'une source anthropique, on ignore quel rôle la géologie sous-jacente pourrait jouer. Pour évaluer la possibilité que la contamination par le Hg puisse provenir, du moins en partie, du substrat rocheux sous-jacent, nous présentons des analyses du Hg de roches granitiques riches en biotite, de roches granitiques riches en muscovite et de roches maﬁques du secteur qui compléteront les études régionales antérieures. Une matrice de corrélation révèle des corrélations positives déterminantes entre le Hg, le Mg, le Fe et le Ca, ainsi qu'avec les éléments traces de Co, Fe, Ga, Mg, Mn, Mo, S, Sr, Te et V. Les concentrations de Hg les plus élevées dans les roches granitiques se trouvent dans les échantillons de la granodiorite du lac Boot, qui renferme jusqu'à 32 % de biotite. Les roches granitiques à forte teneur en muscovite présentent constamment de faibles concentrations de Hg. Nous appuyant sur l'ensemble de ces données, nous avançons qu'il existe un lien direct entre les concentrations anomales de Hg dans le substrat rocheux et l'abondance modale de biotite. Cette étude, conjuguée aux travaux antérieurs faisant état de corrélations entre les concentrations élevées de Hg dans le poisson et dans les secteurs reposant sur des roches granitiques à forte teneur en biotite, laisse supposer qu'il faudrait une étude plus approfondie pour vériﬁer la contribution possible des roches riches en biotite à la contamination de l'écosystème du parc national Kejimkujik.
Use of the QR Reader to Provide Real-Time Evaluation of Residents' Skills Following Surgical Procedures
Authors: Reynolds Kellin , Barnhill Danny , Sias Jamie , Young Amy , Polite Florencia Greer
Published: September 2014

Background

A portable electronic method of providing instructional feedback and recording an evaluation of resident competency immediately following surgical procedures has not previously been documented in obstetrics and gynecology.

Objective

This report presents a unique electronic format that documents resident competency and encourages verbal communication between faculty and residents immediately following operative procedures.

Methods

The Microsoft Tag system and SurveyMonkey platform were linked by a 2-D QR code using Microsoft QR code generator. Each resident was given a unique code (TAG) embedded onto an ID card. An evaluation form was attached to each resident's file in SurveyMonkey. Postoperatively, supervising faculty scanned the resident's TAG with a smartphone and completed the brief evaluation using the phone's screen. The evaluation was reviewed with the resident and automatically submitted to the resident's educational file.

Results

The evaluation system was quickly accepted by residents and faculty. Of 43 residents and faculty in the study, 38 (88%) responded to a survey 8 weeks after institution of the electronic evaluation system. Thirty (79%) of the 38 indicated it was superior to the previously used handwritten format. The electronic system demonstrated improved utilization compared with paper evaluations, with a mean of 23 electronic evaluations submitted per resident during a 6-month period versus 14 paper assessments per resident during an earlier period of 6 months.

Conclusions

This streamlined portable electronic evaluation is an effective tool for direct, formative feedback for residents, and it creates a longitudinal record of resident progress. Satisfaction with, and use of, this evaluation system was high.
Financing Residency Training Redesign
Authors: Carney Patricia A. , Waller Elaine , Green Larry A. , Crane Steven , Garvin Roger D. , Pugno Perry A. , Kozakowski Stanley M. , Douglass Alan B. , Jones Samuel , Eiff M. Patrice
Published: September 2014

Background

Redesign in the health care delivery system creates a need to reorganize resident education. How residency programs fund these redesign efforts is not known.

Methods

Family medicine residency program directors participating in the Preparing Personal Physicians for Practice (P4) project were surveyed between 2006 and 2011 on revenues and expenses associated with training redesign.

Results

A total of 6 university-based programs in the study collectively received $5,240,516 over the entire study period, compared with $4,718,943 received by 8 community-based programs. Most of the funding for both settings came from grants, which accounted for 57.8% and 86.9% of funding for each setting, respectively. Department revenue represented 3.4% of university-based support and 13.1% of community-based support. The total average revenue (all years combined) per program for university-based programs was just under $875,000, and the average was nearly $590,000 for community programs. The vast majority of funds were dedicated to salary support (64.8% in university settings versus 79.3% in community-based settings). Based on the estimated ratio of new funding relative to the annual costs of training using national data for a 3-year program with 7 residents per year, training redesign added 3% to budgets for university-based programs and about 2% to budgets for community-based programs.

Conclusions

Residencies undergoing training redesign used a variety of approaches to fund these changes. The costs of innovations marginally increased the estimated costs of training. Federal and local funding sources were most common, and costs were primarily salary related. More research is needed on the costs of transforming residency training.
Patient No-Show Predictive Model Development using Multiple Data Sources for an Effective Overbooking Approach
Authors: Hanauer D.A. , Huang Y.
Published: September 2014

Background: Patient no-shows in outpatient delivery systems remain problematic. The negative impacts include underutilized medical resources, increased healthcare costs, decreased access to care, and reduced clinic efficiency and provider productivity.

Objective: To develop an evidence-based predictive model for patient no-shows, and thus improve overbooking approaches in outpatient settings to reduce the negative impact of no-shows.

Methods: Ten years of retrospective data were extracted from a scheduling system and an electronic health record system from a single general pediatrics clinic, consisting of 7,988 distinct patients and 104,799 visits along with variables regarding appointment characteristics, patient demographics, and insurance information. Descriptive statistics were used to explore the impact of variables on show or no-show status. Logistic regression was used to develop a no-show predictive model, which was then used to construct an algorithm to determine the no-show threshold that calculates a predicted show/no-show status. This approach aims to overbook an appointment where a scheduled patient is predicted to be a no-show. The approach was compared with two commonly-used overbooking approaches to demonstrate the effectiveness in terms of patient wait time, physician idle time, overtime and total cost.

Results: From the training dataset, the optimal error rate is 10.6% with a no-show threshold being 0.74. This threshold successfully predicts the validation dataset with an error rate of 13.9%. The proposed overbooking approach demonstrated a significant reduction of at least 6% on patient waiting, 27% on overtime, and 3% on total costs compared to other common flat-overbooking methods.

Conclusions: This paper demonstrates an alternative way to accommodate overbooking, accounting for the prediction of an individual patient’s show/no-show status. The predictive no-show model leads to a dynamic overbooking policy that could improve patient waiting, overtime, and total costs in a clinic day while maintaining a full scheduling capacity.

Citation: Huang Y, Hanauer D.A. Patient no-show predictive model development using multiple data sources for an effective overbooking approach. Appl Clin Inf 2014; 5: 836–860

http://dx.doi.org/10.4338/ACI-2014-04-RA-0026
Intercontinental transport and deposition patterns of atmospheric mercury from anthropogenic emissions
Authors: Chen L. , Wang H. H. , Liu J. F. , Tong Y. D. , Ou L. B. , Zhang W. , Hu D. , Chen C. , Wang X. J.
Published: September 2014

Abstract. Global policies that regulate anthropogenic mercury emissions to the environment require quantitative and comprehensive source–receptor relationships for mercury emissions, transport and deposition among major continental regions. In this study, we use the GEOS-Chem global chemical transport model to establish source–receptor relationships among 11 major continental regions worldwide. Source–receptor relationships for surface mercury concentrations (SMC) show that some regions (e.g., East Asia, the Indian subcontinent, and Europe) should be responsible for their local surface Hg(II) and Hg(P) concentrations due to near-field transport and deposition contributions from their local anthropogenic emissions (up to 64 and 71% for Hg(II) and Hg(P), respectively, over East Asia). We define the region of primary influence (RPI) and the region of secondary influence (RSI) to establish intercontinental influence patterns. Results indicate that East Asia is the SMC RPI for almost all other regions, while Europe, Russia, and the Indian subcontinent also make some contributions to SMC over some receptor regions because they are dominant RSI source regions. Source–receptor relationships for mercury deposition show that approximately 16 and 17% of dry and wet deposition, respectively, over North America originate from East Asia, indicating that transpacific transport of East Asian emissions is the major foreign source of mercury deposition in North America. Europe, Southeast Asia, and the Indian subcontinent are also important mercury deposition sources for some receptor regions because they are the dominant RSIs. We also quantify seasonal variation on mercury deposition contributions over other regions from East Asia. Results show that mercury deposition (including dry and wet) contributions from East Asia over the Northern Hemisphere receptor regions (e.g., North America, Europe, Russia, the Middle East, and Middle Asia) vary seasonally, with the maximum values in summer and minimum values in winter. The opposite seasonal pattern occurs on mercury dry deposition contributions over Southeast Asia and the Indian subcontinent.