Millstone Grit Cyclicity Revisited, II: Sequence Stratigraphy and Sedimentary Responses to Changes of Relative Sea-Level

2009 ◽  
pp. 305-327 ◽  
Author(s):  
Ole J. Martinsen ◽  
John D. Collinson ◽  
Brian K. Holdsworth
Keyword(s):  
Sea Level ◽  
Sequence Stratigraphy ◽  
Relative Sea Level

Critical view of the concept of sequence stratigraphy

2020 ◽  
Author(s):  
Alexander L. Beisel ◽  
Keyword(s):  
Theoretical Analysis ◽  
Sea Level ◽  
Sequence Stratigraphy ◽  
Relative Sea Level ◽  
Critical View ◽  
Sinusoidal Shape ◽  
Definition Of ◽  
Modern Varieties

Based on a theoretical analysis, the main shortcomings of modern varieties of the concept of sequence stratigraphy are shown: they do not comply with the definition of the relative sea level, which is given by the authors themselves; the nature of tectonic immersion, which cannot have a sinusoidal shape, is not taken into account; the boundaries of sequences, identified as subaerial disagreements on the periphery of the cover, are unlawfully compared with consonant boundaries within the basins. The need for a thorough review of this concept based on the new basic provisions is shown.

Late Quaternary sequence stratigraphy of the Mackenzie Delta

1996 ◽  
Vol 33 (7) ◽  
pp. 1053-1074 ◽  
Author(s):  
Philip R Hill
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Sequence Stratigraphy ◽  
Late Quaternary ◽  
Sediment Supply ◽  
Mackenzie Delta ◽  
Relative Sea Level ◽  
Relative Sea Level Rise ◽  
Healing Phase ◽  
Late Wisconsinan

The Late Wisconsinan and Holocene sequence stratigraphy of the Mackenzie Delta provides insights into the glacial history of the region. The base of the described succession is a hummocky regional reflector interpreted to be a flooding surface formed immediately after retreat of glacial ice from the Mackenzie Trough. Above this flooding surface, two progradational parasequences are present. The first, assigned to the transgressive systems tract, is correlated with the Tutsieta Lake readvance of the ice sheet at approximately 13 000 BP. A flooding surface forming the upper boundary of this parasequence extends inland to at least Inuvik, developing as a response to glacial retreat and early Holocene relative sea level rise. The second parasequence of Holocene deltaic deposits is assigned to the highstand systems tract and is characterized by progressive progradation of the delta into the Mackenzie Trough to a position seaward of the present delta coastline. A distinct reduction in gradient of the most recent delta clinoforms is consistent with other data suggesting regional transgression and is interpreted to represent the development of a healing-phase wedge. The reasons for this recent transgression are not clear, because relative sea level rise has decreased and sediment supply probably increased over the last 2000 years. Transgression may be related to decreased efficiency of channels, increased trapping of sediments by thermokarst lakes, overspill of the delta across the eastern margin of the valley, and (or) progressively greater exposure to wave action as the delta became less sheltered by the confines of the glacial valley.

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