Seascapes, Placentia Bay, Newfoundland and Labrador

Shaw, J; Potter, D P; Kostylev, V E

doi:10.4095/288644

Cited by 5 publications

(3 citation statements)

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“…Legend lists four environments and their associated glacial and glaciomarine landforms. For optimum visual representation at the scale of the four panels, the depiction of landforms has been simplified for Placentia Bay from Brushett et al (2007), Shaw et al (2011), Shaw and Potter (2016), for Bay of Fundy from Todd and Shaw (2012), Todd et al (2016), and for Hecate Strait from Shaw and Lintern (2016), Shaw et al (2017, 2020). [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Discussionmentioning

confidence: 99%

“…The bay is underlain by sedimentary rocks of Cambro‐Ordovician age close to shore, Pennsylvanian age in the centre of the bay, and Cretaceous–Tertiary age in the outer bay (Wheeler et al , 1996). The Placentia Bay glacial landsystem records the advance and retreat of glacial ice in Placentia Bay (Shaw et al , 2006; Brushett et al , 2007; Shaw et al , 2009, 2011, 2013; Shaw and Potter, 2016). On the western side of Placentia Bay offshore the Burin Peninsula, drumlins and glacial lineations indicate ice flow to the southeast and south with drumlins transitioning to megaflutes to the south.…”

Section: Discussionmentioning

confidence: 99%

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Deglacial dynamics of the Foxe–Baffin Ice Sheet, Frobisher Bay, Nunavut, Canada revealed by submarine landform mapping

Todd

Dowdeswell

Shaw

et al. 2022

J Quaternary Science

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Previous interpretation of the nature and distribution of subaerial glacial landforms established that Frobisher Bay in southeastern Baffin Island was glaciated in the Late Wisconsinan by ice flowing southeast from the Foxe–Baffin Ice Dome. New seafloor mapping within the bay has revealed submarine glacial landforms that are described and interpreted in the context of their subglacial, ice‐marginal, glaciomarine and marine process environments. Interpretation of the evidence confirms that ice occupied Frobisher Bay, flowing from the northwest to southeast, parallel to the orientation of the bay. Relatively rapid ice velocities are indicated by the presence of ice‐moulded bedrock and megaridges flanking a deep trough (>700 m) along the faulted southern flank of Frobisher Bay. In shallower regions, areal scouring and channelisation indicate the widespread presence of glacial ice. As ice retreated to the northwest towards the Foxe Ice Dome, De Geer and recessional moraines were deposited at the ice front. The latter correlate spatially with the extensive Frobisher Bay Moraine System on land. Two iceberg ploughmark populations are evident, with smaller relict features in shallow water in rare locations in the northwest of the bay, and larger relict and modern ploughmarks in deeper water in outer Frobisher Bay.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Deglacial dynamics of the Foxe–Baffin Ice Sheet, Frobisher Bay, Nunavut, Canada revealed by submarine landform mapping

Todd

Dowdeswell

Shaw

et al. 2022

J Quaternary Science

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“…For example, 'Hormathia sp.1' was often seen attached to the sporadic boulders scattered across the silt-covered seafloor in the deep channels within Rushoon. Drop stones resulting from glacial retreat (Shaw et al, 2011) have been shown to increase diversity of more homogeneous sediment dominated areas (Meyer et al, 2016). This fine-scale feature cannot currently be captured by acoustic surveying techniques such as MBES, but new methods such as synthetic apertures sonar may provide this capability (Gini et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Spatial distribution of benthic flora and fauna of coastal placentia bay, an ecologically and biologically significant area of the island of newfoundland, atlantic Canada

Mackin-McLaughlin

Nemani²,

Misiuk³

et al. 2022

Front. Environ. Sci.

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Coastal habitats have the potential to be biodiversity hotspots that provide important ecosystem services, but also hotspots for human development and exploitation. Continued use of coastal ecosystem services requires establishing baselines that capture the present state of the benthos. This study employs habitat mapping to establish a baseline describing the spatial distribution of benthic organisms along the western coast of Placentia Bay, an Ecologically and Biologically Significant Area (EBSA) in Newfoundland, Canada. The influence of seafloor characteristics on the distribution of four dominant epifaunal assemblages and two macrophyte species were modelled using two machine learning techniques: the well-established Random Forest and the newer Light Gradient Boosting Machine. When investigating model performance, the inclusion of fine-scale (<1 m) substrate information from the benthic videos was found to consistently improve model accuracy. Predictive maps developed here suggest that the majority of the surveyed areas consisted of a species-rich epifaunal assemblage dominated by ophiuroids, porifera, and hydrozoans, as well as prominent coverage by Agarum clathratum and non-geniculate crustose coralline algae. These maps establish a baseline that enables future monitoring of Placentia Bay’s coastal ecosystem, helping to conserve the biodiversity and ecosystem services this area provides.

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Geomorphic diversity of the Newfoundland and Labrador Shelves Bioregion

Shaw

Kostylev

2023

Can. J. Earth Sci.

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The Newfoundland and Labrador Shelves Bioregion, located on the glaciated continental shelf and adjacent continental slope of eastern Canada, is classified into units that reflect its great physiographic diversity. There are ten shelf units: bedrock zone, fiord systems, major inlet, shelf-crossing troughs, four types of offshore banks, basin, and disturbed (glaciotectonic) terrain. There are three units on the continental slope: channelized areas, trough-mouth areas, and large sedimentary drifts. A series of vignettes illustrates both the distinguishing characteristics of the principal geomorphic units and the morphologic diversity within them. A sediment mobility analysis reveals that wave and current-generated disturbance is dominant and largely depth-controlled within the shelf units, while the south-flowing Labrador Current impacts sediment transport and mobility along the continental slope.

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Seascapes, Placentia Bay, Newfoundland and Labrador

Cited by 5 publications

References 0 publications

Deglacial dynamics of the Foxe–Baffin Ice Sheet, Frobisher Bay, Nunavut, Canada revealed by submarine landform mapping

Deglacial dynamics of the Foxe–Baffin Ice Sheet, Frobisher Bay, Nunavut, Canada revealed by submarine landform mapping

Spatial distribution of benthic flora and fauna of coastal placentia bay, an ecologically and biologically significant area of the island of newfoundland, atlantic Canada

Geomorphic diversity of the Newfoundland and Labrador Shelves Bioregion

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