Seismic Stratigraphy

Bertram, G. T.; Milton, N. J.

doi:10.1002/9781444313710.ch3

Cited by 8 publications

(9 citation statements)

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“…The Exxon sequence stratigraphic model for the evolution of passive margin slopes (e.g. Vail et al ., 1991) envisages that (i) large sandy turbidite systems overlie depositional sequence boundaries, at least on the lower slope and basin floor; and (ii) debrites and slumps characterize the lowstand prograding wedge (see discussion in Kolla, 1993; Bertram et al ., 1996). The Vocontian slope sequences demonstrate that, on the slope, the sequence boundary may be associated with the base of large muddy debris flows, the base of sandy turbidite packages or even a black shale horizon (e.g.…”

Section: Sequence Stratigraphic Organization Of Unstable Slopesmentioning

confidence: 99%

Anatomy of ancient passive margin slope systems: Aptian gravity‐driven deposition on the Vocontian palaeomargin, western Alps, south‐east France

Friès¹,

Parize²

2003

Sedimentology

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The Aptian succession on the Vocontian palaeomargin (south‐east France) consists of marl and marly calcareous pelagic slope facies together with a range of gravity‐driven deposits (slumps, debris‐flow deposits, turbidite packages and massive sandstones). The massive sandstones were emplaced by high‐density turbidity currents and are associated with extensive clastic sills and dykes. The sedimentology is constrained by a high‐resolution bio‐ and lithostratigraphic framework and permits a detailed analysis of the slope succession including: (1) a sequence stratigraphical analysis of the slope deposits; and (2) lateral tracing of individual sedimentary packages downslope. The resulting model for the Vocontian slope represents an alternative to the ‘classic’ Exxon delta‐fed, mud‐rich model. Key elements of the Vocontian model are: (1) an emphasis on lowstand slope erosion and complex slope morphology controlled by contemporary tectonism and salt diapirism; (2) slope deposition in confined erosional and structurally controlled conduits rather than the buildout of slope fans/channel‐levee complexes; (3) a dominance of large‐volume muddy slump and transitional debris‐flow deposits, with subordinate sandy turbidites, including significant massive sandstone facies; (4) common sand injections (sills and dykes) associated with the massive sandstone facies; and (5) minimal downslope evolution of the flows, with the nature of the source sediment being the over‐riding factor determining flow behaviour and deposit character. The Vocontian system is a rare instance in which large sections of a ‘fossil’ passive margin slope are preserved in the geological record. The slope deposits differ from the classic models of turbidite systems that have mainly been built from peripheral foreland basins, and the new insight makes it possible to compare ancient and present‐day passive margin slope systems.

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Section: Sequence Stratigraphic Organization Of Unstable Slopesmentioning

confidence: 99%

Anatomy of ancient passive margin slope systems: Aptian gravity‐driven deposition on the Vocontian palaeomargin, western Alps, south‐east France

Friès¹,

Parize²

2003

Sedimentology

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“…This is the "foreshortening" or "squashing" method discussed by Feagin (1981) and Bertram and Milton (1996). This may be the reasoning behind much of the seismic that is displayed at VE > 6 (37% of all data).…”

Section: Low Relief Structuresmentioning

confidence: 94%

“…The origins of horizontal exaggeration as a separate component may arise from lateral shortening required to fit long sections on to a screen. Or it may be inherited from times when use of paper seismic was more widespread e practitioners commonly viewed hardcopy seismic at a low angle to more clearly see low amplitude structures and low angle stratal relationships, a technique called "foreshortening" that is equivalent to HE < 1 (Feagin, 1981;Bertram and Milton, 1996). No doubt, many of the seismic lines reviewed in this study have been laterally squashed for various reasons, but the results can still be fully described by a single vertical exaggeration.…”

Section: Definition Of Vertical Exaggerationmentioning

confidence: 99%

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Vertical exaggeration of reflection seismic data in geoscience publications 2006–2010

Stewart

2011

Marine and Petroleum Geology

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“…Of course, Emmons' conclusions about the Lubec canal section were only partly correct in the light of modern understanding. The Presumpscot Formation formed by coastal drowning due to post-glacial sea level rise during Meltwater Pulse 1A (resulting in the transgression of the DeGeer Sea), an interpretation that relies on the glacioeustatic concept, not developed until the mid-Nineteenth Century (Bertram et al 1996). Its present elevation above sea level results from isostatic rebound (Fleming et al 1998).…”

Section: An Education In Quoddy Baymentioning

confidence: 99%

New Brunswick and Nova Scotia: the First Geological Field Trip by a North American College

Falcon-Lang¹

2009

atgeol

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The first known geological excursion by a North American college was conducted in 1835. Twenty staff and students belonging to Williams College -a liberal arts college in Massachusetts, USA -explored the geology bordering the Bay of Fundy in northeast Maine, New Brunswick and Nova Scotia. Led by two young professors of natural history, Ebenezer Emmons and Albert Hopkins, the party made extensive observations around Pasammaquoddy Bay, Saint John, Parrsboro, and Windsor, as well as more widely through the Minas and Cumberland basins. Although partly following in the footsteps of two pioneering Bostonians, Charles Jackson and Francis Alger, who had reconnoitred the region in the late 1820s, the Williams College party nevertheless made several original observations. One of most important was a study of the anatomy and paleoclimatic significance of permineralized plants from Joggins and Grindstone Island undertaken by Emmons. This was only the second study of its kind worldwide and later inspired William Dawson to do similar work. Largely overlooked by historians of geology, the Williams College expedition, which comprised a four-week voyage of about 1800 km, illustrates well the challenges and opportunities of geological field work in the early Nineteenth Century. rÉSUMÉLa première excursion géologique connue d'un collège nord-américain a été réalisée en 1835. Vingt membres du personnel et étudiants du Collège Williams -collège d'arts libéraux du Massachusetts, Etats-Unis -ont exploré la géologie des bords de la baie de Fundy dans le nord-est du Maine, au Nouveau-Brunswick et en Nouvelle-Écosse.

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Seismic Stratigraphy

Cited by 8 publications

References 0 publications

Anatomy of ancient passive margin slope systems: Aptian gravity‐driven deposition on the Vocontian palaeomargin, western Alps, south‐east France

Anatomy of ancient passive margin slope systems: Aptian gravity‐driven deposition on the Vocontian palaeomargin, western Alps, south‐east France

Vertical exaggeration of reflection seismic data in geoscience publications 2006–2010

New Brunswick and Nova Scotia: the First Geological Field Trip by a North American College

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