scholarly journals Eastern shore of Nova Scotia: coastal response to sea-level rise and human interference

1996 ◽  
Author(s):  
R B Taylor ◽  
J Shaw ◽  
D L Forbes ◽  
D Frobel
Keyword(s):  
Nova Scotia ◽  
Sea Level Rise ◽  
Sea Level ◽  
Eastern Shore ◽  
Human Interference

The Goldenville–Halifax transition, Mahone Bay, Nova Scotia: relative sea-level rise in the Meguma source terrane

1992 ◽  
Vol 29 (5) ◽  
pp. 1091-1105 ◽  
Author(s):  
John W. F. Waldron
Keyword(s):  
Nova Scotia ◽  
Sea Level Rise ◽  
Sea Level ◽  
Source Area ◽  
Submarine Fan ◽  
Relative Sea Level ◽  
Sea Floor ◽  
Sand Supply ◽  
Relative Sea Level Rise ◽  
Organic Productivity

In the Meguma Group of Nova Scotia, the transition from sand-rich turbidites of the Goldenville Formation to overlying mud-rich turbidites of the Halifax Formation shows unusually rapid vertical facies variations. The Tancook member of the Goldenville Formation is divided into four laterally continuous units. Unit 1 consists of generally thinly bedded classical turbidites interpreted as lobe facies. Unit 2 comprises mottled (bioturbated) and laminated muds. Units 3 and 4 contain packets of thick amalgamated sandstone beds, alternating with more thinly bedded muddy sections. A unique bioclastic bed occurs near the top of unit 3. In unit 4, burrowed sandstone packets traced along strike (across paleocurrent) are not significantly incised into underlying muds. Laminated slates and siltstones of the overlying Mosher's Island member (Halifax Formation) are enriched in manganese and trace metals and contain diagenetic concretions of manganoan carbonate rimmed by metamorphic garnet. The overlying Cunard member comprises dark grey to black, strongly cleaved, carbon-rich slates, interbedded with thin, pyrite-rich, graded siltstones.Changes in the transition zone can be explained by a relative sea-level rise in the Gondwanaland source area of the Meguma Group. During deposition of the Tancook member, turbidite sand supply was progressively and intermittently interrupted as sand became trapped on the shelf. In unit 1, deposition occurred in a submarine-fan system; in higher units, deposition of sandstone packets was probably controlled by transgressions and regressions in the source area. Expanded shelves, briefly colonized by a shelly fauna, led to high organic productivity and eventual anoxia. During deposition of the Mosher's Island member, manganese was concentrated in reducing waters, delivered to the sea floor close to the oxic–anoxic boundary, and trapped as carbonate during early diagenesis. Expansion of fully anoxic conditions led to deposition of black, sulphide-rich shales of the Cunard member.

Late Holocene salt marsh development under a regime of rapid relative-sea-level rise: Chezzetcook Inlet, Nova Scotia. Implications for the interpretation of palaeomarsh sequences

1993 ◽  
Vol 30 (7) ◽  
pp. 1374-1384 ◽  
Author(s):  
S. C. Jennings ◽  
R. W. G. Carter ◽  
J. D. Orford
Keyword(s):  
Nova Scotia ◽  
Salt Marsh ◽  
Sea Level Rise ◽  
Sea Level ◽  
Late Holocene ◽  
Environmental Gradients ◽  
Relative Sea Level ◽  
Spatial Changes ◽  
Relative Sea Level Rise ◽  
Outer Estuary

Pollen data illustrating a 2000-year record of salt marsh development have been obtained from a variety of outer-estuarine settings in close proximity to the present gravel-dominated coastal barriers at Chezzetcook Inlet, Nova Scotia. The relationship between the biostratigraphic and lithostratigraphic data and relative-sea-level movement is complex. In the outer estuary, temporal and spatial changes to the floral and sedimentological composition of the salt marsh reflect principally processes of estuarine and back-barrier sedimentation that resulted in steep environmental gradients and the development of regressive marsh–sediment complexes, despite a relative-sea-level rise of up to 3.8 mm/a during the late Holocene. Our results contrast with those from the inner estuary at Chezzetcook Inlet, where salt marsh has developed only over the last 200 years as a result of sediment inwash due to European land use, and followed a prolonged episode (approx. 5000 years) of tidal flat conditions. This contrast highlights differences in sediment input and distribution between the outer and inner estuary.

Recent evolution of a paraglacial estuary under conditions of rapid sea-level rise: Chezzetcook Inlet, Nova Scotia

1992 ◽  
Vol 103 ◽  
pp. 167-185 ◽  
Author(s):  
R.W.G. Carter ◽  
J.D. Orford ◽  
S.C. Jennings ◽  
J. Shaw ◽  
J.P. Smith
Keyword(s):  
Nova Scotia ◽  
Sea Level Rise ◽  
Sea Level
Sign in / Sign up

Export Citation Format

Share Document