Deglaciation of Port Hood Island, Nova Scotia

1974 ◽  
Vol 11 (10) ◽  
pp. 1357-1365 ◽  
Author(s):  
J. Terasmae
Keyword(s):  
Nova Scotia ◽  
Radiocarbon Dating ◽  
Climatic Conditions ◽  
Western Cape ◽  
Cape Breton Island ◽  
Cape Breton ◽  
Soil Creep ◽  
Palynological Study ◽  
Surficial Deposits

A palynological study and radiocarbon dating of surficial deposits on Port Hood Island, Nova Scotia, have indicated that deglaciation occurred more than 11 000 yr B.P., and that the presence of an 'upper till' in local depressions is attributable to soil-creep processes under cold and wet climatic conditions some 11 000 to 10 000 yr B.P. No evidence was found of an ice advance younger than 11 000 yr B.P. in western Cape Breton Island.

Allerød–Younger Dryas Coleoptera from western Cape Breton Island, Nova Scotia, Canada

1996 ◽  
Vol 33 (1) ◽  
pp. 33-41 ◽  
Author(s):  
Randall F. Miller
Keyword(s):  
Nova Scotia ◽  
Younger Dryas ◽  
Late Glacial ◽  
Cold Climate ◽  
Western Cape ◽  
Cape Breton Island ◽  
Cape Breton ◽  
Beetle Assemblages ◽  
Climate Indicator ◽  
Younger Dryas Event

Studies of Coleoptera remains from two late-glacial sites on Cape Breton Island, Nova Scotia, Canada, present a picture of the paleoenvironment and paleoclimate during the Allerød–Younger Dryas transition in the Maritimes region. They provide evidence for the Younger Dryas event in northeastern North America. Between 11 300 and 10 800 BP, the beetle assemblages at the Campbell site are typical of faunas of the modern middle to northern boreal forest. The West Mabou site contains beetle fossils younger than 10 900 BP, possibly as young as 10 500 BP, extending into the time period of the Younger Dryas, dated from 10 800 to 10 000 BP in the Maritimes. A "cold climate" indicator recognizable in the beetle fauna, Olophrum boreale, occurs in relative abundance and provides an interesting comparison with sites in Europe where the same northern boreo-montane species is evident at the beginning of the Younger Dryas.

Determination of nearshore geologic structure off western Cape Breton Island, Nova Scotia, using high-resolution marine magnetics

2002 ◽  
Vol 39 (9) ◽  
pp. 1299-1312 ◽  
Author(s):  
Sonya A Dehler ◽  
D Patrick Potter
Keyword(s):  
Nova Scotia ◽  
High Resolution ◽  
Transition Zone ◽  
Magnetic Data ◽  
Magnetic Observatory ◽  
Western Cape ◽  
Offshore Structure ◽  
Seismic Reflection Data ◽  
Cape Breton Island ◽  
Cape Breton

New high-resolution magnetic data have been acquired along the coast of western Cape Breton Island near Cheticamp, Nova Scotia, in a transition zone between exposed, elevated basement of the Cape Breton highlands and the adjacent Carboniferous sediment-filled Magdalen Basin. These data were collected to provide continuity between the mapped onshore geology and the geophysical-based interpretations of offshore structure. Separation of the geologic component of the data from the effects of diurnal and other variations in the Earth's magnetic field was made difficult by recording problems at the nearby base recording station. Careful correlation of the fragmented station signal with records from a nearby permanent magnetic observatory enabled a reasonable diurnal signal to be synthesized and applied successfully to the data. Additional processing and filtering helped to enhance small anomalies in the data. Several low-amplitude, fairly linear magnetic anomalies are visible in the reduced anomaly data, generally trending north to northwest away from the coastline. Small-amplitude lineations in the offshore at Cheticamp are associated with folded, tilted, or faulted strata imaged on coincident seismic reflection data and are interpreted as representing juxtaposed units of Carboniferous strata. Other small anomalies appear to represent shallow contacts between intrusive or metasedimentary rocks visible in outcrops near the coast. A stronger, coast-parallel anomaly that extends across the study area from a regional magnetic high in the north is coincident with an offset in basement rocks or deeper strata beneath Carboniferous basin fill. This anomaly may mark part of the faulted transition zone between the elevated highlands of northwestern Cape Breton Island and the Magdalen Basin depocentre.

The Cheticamp pluton: a Cambrian granodioritic intrusion in the western Cape Breton Highlands, Nova Scotia

1986 ◽  
Vol 23 (11) ◽  
pp. 1686-1699 ◽  
Author(s):  
Sandra M. Barr ◽  
Alan S. Macdonald ◽  
John Blenkinsop
Keyword(s):  
Nova Scotia ◽  
Chemical Compositions ◽  
Western Cape ◽  
Fractionation Process ◽  
Cape Breton Island ◽  
Stratigraphic Unit ◽  
The North ◽  
Rock Types ◽  
Cape Breton ◽  
Appalachian Orogen

The Cheticamp pluton consists of biotite granodiorite (locally megacrystic) in the north and museovite–biotite granodiorite in the south, in probable faulted contact. These two rock types, especially the biotite granodiorite, show a broad range in modal and chemical compositions. They are interpreted to be cogenetic, with the museovite–biotite grandiorite derived from the biotite granodiorite by crystal fractionation involving mafic minerals, plagioclase, and sphene. The overall peraluminous composition of the suite resulted from the fractionation process, probably enhanced by alteration, rather than from derivation from peraluminous source rocks.A seven-point, whole-rock, Rb–Sr isochron indicates an age of 525 ± 40 Ma. The pluton intruded dioritic rocks and quartzo-feldspathic gneisses, thus indicating Precambrian ages for these units. It probably also postdates the Western Highlands volcanic–sedimentary complex, a major undated stratigraphic unit in the Cape Breton Highlands. Although the age overlaps the range of Rb–Sr ages from plutons of the Avalon Terrane of the Appalachian orogen, the geological setting of the Cheticamp pluton differs from that of true Avalonian plutons, such as those in southeastern Cape Breton Island.

scholarly journals Rosa rugosa as an Invader of Coastal Sand Dunes of Cape Breton Island and Mainland of Nova Scotia

2010 ◽  
Vol 124 (2) ◽  
pp. 151 ◽  
Author(s):  
Nicholas Hill ◽  
Leah Beveridge ◽  
Andrea Flynn ◽  
David J. Garbary
Keyword(s):  
Nova Scotia ◽  
Sand Dunes ◽  
Western Cape ◽  
Coastal Sand Dunes ◽  
Rosa Rugosa ◽  
Cape Breton Island ◽  
Ammophila Breviligulata ◽  
Cape Breton ◽  
Coastal Sand ◽  
First Time

Rosa rugosa is described for the first time as an invasive species associated with coastal sand dunes in Atlantic Canada. Our surveys of 24 beaches on western Cape Breton Island and the mainland of northern Nova Scotia from Cheticamp to Fox Harbour showed that 11 of the dune systems (ca. 45%) were colonized. This was more prevalent in Cape Breton where R. rugosa occurred on 9 of 13 systems, whereas only 2 of 9 mainland systems were colonized. Four dunes (three in Cape Breton) were considered heavily colonized with 0.4 - 8.8% of the dune area with cover of R. rugosa. These beaches had 12 - 42 independent clumps with almost monospecific stands over 90% cover. In general, heavily colonized beaches were found adjacent to communities where extensive domestic planting and hedges of R. rugosa occurred and where escapes onto roadsides had occurred. In most colonized beach systems, rhizomes from clones extended 1 - 5 m to produce younger shoots. The absence of Ammophila breviligulata, Lathyrus maritimus and Myrica pensylvanica, from the interior of many clumps of R. rugosa suggests that native dune communities are being negatively impacted. This exacerbates dune integrity already compromised by impacts of sea level rise.

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