Probable tertiary sediments from a submarine canyon off Nova Scotia

Marlowe, James I.

doi:10.1016/0025-3227(65)90037-x

Cited by 16 publications

(11 citation statements)

References 4 publications

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“…The complex bottom topography results in a variety of benthic habitats ranging from steeply sloped bedrock outcroppings to gravel-dominated glacial till, fine to medium sand, silty-sand and mud bottom types (Amos 1989, Kostylev et al 2001, Fader & Strang 2002. The distribution of Tertiary and Holocene sediments within inner parts of The Gully canyon system may reflect tidally driven resupension and erosion (Marlow 1965, Jacques Whitford Environmental 2001). Transport appears to occur in a southward direction, with sediment moving from surrounding shelves into the canyon head areas (Amos 1989, Piper et al 1990, Fader & Strang 2002.…”

Section: Introductionmentioning

confidence: 99%

Benthic epifauna assemblages, biomass and respiration in The Gully region on the Scotian Shelf, NW Atlantic Ocean

Hargrave¹,

Kostylev²,

Hawkins³

2004

Mar. Ecol. Prog. Ser.

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Epifauna community assemblages were identified by analysis of 35 mm still pictures taken at 92 stations in The Gully, a submarine canyon on the edge of the Scotian Shelf off Canada's east coast. Numbers of epifauna taxa, seabed type and area of hard (gravel) substrate were measured in images from underwater camera systems. A substrate hardness index, and epifauna community biomass and respiration rates were calculated at 31 stations within The Gully and on adjacent banks using image analysis, volume conversion factors and an empirical allometric regression between wet weight and measured respiration rates for major epifauna taxa. Average turnover time (TT) in days for each location was calculated as energy stored in biomass to calories respired. Non-parametric correlation analysis on dissimilitarity matrices and cluster analysis based on water mass, substrate type and bathymetry distinguished 6 types of benthic habitats and 7 assemblages of co-occurring assemblages for 175 epifauna taxa associated with specific habitat types. Sandy areas on adjacent banks (50 to 300 m) were dominated by echinoderms. Stations with glaciomarine sediments near the head of The Gully (100 to 500 m), dominated by anemones, sponges and soft corals, had the greatest numbers of taxa. Epifauna biomass and respiration rates were highest where gravel cover was > 50%. There were fewer taxa with lower biomass and respiration in deeper (> 500 m) water. Deep-water brittle stars, hard and soft coral and anemone species predominated where the proportion of hard substrate decreased (< 50%). Average TT was low (388 and 453 d) at stations 200 to 500 m deep and in the mid-central areas of The Gully, where the percentage of rock cover was > 50%, with a trend to higher values (> 600 d) in deeper water. Stations with low TT values were dominated by molluscs. The observations suggest that organically rich particulate matter used by suspension-and depositfeeding epifauna is transported from the head of the canyon and surrounding banks down the axis of The Gully.

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Section: Introductionmentioning

confidence: 99%

Benthic epifauna assemblages, biomass and respiration in The Gully region on the Scotian Shelf, NW Atlantic Ocean

Hargrave¹,

Kostylev²,

Hawkins³

2004

Mar. Ecol. Prog. Ser.

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“…Sediments of Tertiary age from a submarine canyon off Nova Scotia were reported by Marlowe (1965). The Oligocene-Miocene age and faunal content of this strata was reported by Marlowe and Bartlett (1967).…”

Section: Previous Workmentioning

confidence: 96%

“…The Oligocene-Miocene age and faunal content of this strata was reported by Marlowe and Bartlett (1967). The mid-Tertiary biostratigraphy of the Scotian Shelf was described by Bartlett (1968).…”

Section: Previous Workmentioning

confidence: 99%

Cretaceous Biostratigraphy of the Grand Banks of Newfoundland

Bartlett

1969

atgeol

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“…lain by Tertiary sediments (VERRILL, 1878;MARLOWE, 1965). Upper Cretaceous fossils have also been collected (DALL, 1925;STEPHENSON, 1936;MARLOWE, 1965) and it is probable that there is present a complete sequence of sedimentary formations ranging from Pleistocene to Cretaceous (and perhaps older), judging by the drilling results from the continental shelf off the United States (BUNCE et al, 1965). RVACHEV (1965) has described the surficial material collected during U.S.S.R. investigations on Banquereau Bank.…”

Section: Reports 16mentioning

confidence: 99%

“…The V's indicate the position of distinctive northeast-trending anomalies which are possibly due to igneous intrusives of Triassic age similar to the Triassic basaltic intrusives which occur on the south shore of the Bay of Fundy. MARLOWE (1964) has collected bottom samples containing basaltic fragments from The Gully which he feels may be of Triassic age.…”

mentioning

confidence: 99%

Geophysical Surveys of the Continental Shelf South of Nova Scotia

Hood

1967

atgeol

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Probable tertiary sediments from a submarine canyon off Nova Scotia

Cited by 16 publications

References 4 publications

Benthic epifauna assemblages, biomass and respiration in The Gully region on the Scotian Shelf, NW Atlantic Ocean

Benthic epifauna assemblages, biomass and respiration in The Gully region on the Scotian Shelf, NW Atlantic Ocean

Cretaceous Biostratigraphy of the Grand Banks of Newfoundland

Geophysical Surveys of the Continental Shelf South of Nova Scotia

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