Low energy, low latitude wave-dominated shallow marine depositional systems: examples from northern Borneo

2013 ◽  
Vol 34 (3-4) ◽  
pp. 367-377 ◽  
Author(s):  
Joseph J. Lambiase ◽  
Suraya Tulot
Keyword(s):  
Low Energy ◽  
Low Latitude ◽  
Shallow Marine ◽  
Depositional Systems

Organic-walled microfossils of the mid-Neoproterozoic Alinya Formation, Officer Basin, Australia

2016 ◽  
Vol 90 (5) ◽  
pp. 854-887 ◽  
Author(s):  
Leigh Anne Riedman ◽  
Susannah Porter
Keyword(s):  
New Combination ◽  
Rapid Decline ◽  
Low Latitude ◽  
Shallow Marine ◽  
Eukaryotic Diversity ◽  
Transmitted Light Microscopy ◽  
Eukaryotic Species ◽  
Morphological Detail ◽  
Microfossil Assemblage ◽  
Scanning Electron

AbstractEstimates of Precambrian eukaryotic diversity and disparity indicate broad trends of increase in the Mesoproterozoic Era, leading to a peak and then rapid decline by ca. 750 Ma. The organic-walled microfossil assemblage presented here is representative of that mid-Neoproterozoic height of eukaryotic species richness. Organic-rich shales and siltstones of the mid-Neoproterozoic upper Alinya Formation, eastern Officer Basin, Australia, preserve an abundant and diverse assemblage of organic-walled microfossils deposited in a low-latitude, shallow marine setting. Use of scanning electron microscopy (SEM) revealed an unexpected level of morphological detail not visible in transmitted light microscopy. This led to the recognition of new species as well as establishment of degradational sequences, which aid in fossil recognition. In total, 26 taxa are described here; these include 21 previously named forms, four newly described species (Caelatimurus foveolatus, Culcitulisphaera revelata, Karenagare alinyaensis, and Morgensternia officerensis), and one new combination (Vidalopalla verrucata).

scholarly journals The Shallow-Marine Architecture Knowledge Store: A database for the characterization of shallow-marine and paralic depositional systems

2016 ◽  
Vol 75 ◽  
pp. 83-99 ◽  
Author(s):  
Luca Colombera ◽  
Nigel P. Mountney ◽  
David M. Hodgson ◽  
William D. McCaffrey
Keyword(s):  
Shallow Marine ◽  
Depositional Systems

scholarly journals The palaeogeographical background of Late Devonian storm events in the western part of the Holy Cross Mountains (Poland)

Geologos ◽  
2013 ◽  
Vol 19 (4) ◽  
pp. 257-272 ◽  
Author(s):  
Aleksandra Vierek
Keyword(s):  
Coarse Grained ◽  
Late Devonian ◽  
Storm Events ◽  
Diagnostic Features ◽  
Shallow Marine ◽  
Tsunami Waves ◽  
Holy Cross Mountains ◽  
Depositional Systems ◽  
Tsunami Energy ◽  
Carbonate Deposits

Abstract Late Devonian coarse-grained carbonate deposits in the Holy Cross Mountains were studied for possible storm depositional systems and catastrophic tsunami events, as it must be assumed that the investigated area was strongly affected by tropical hurricanes generated in the open ocean North of Gondwana. This assumption appears consistent with diagnostic features of carbonate tempestites at several places in the Holy Cross Mountains. Sedimentary structures and textures that indicate so are, among other evidence, erosional bases with sole marks, graded units, intra- and bioclasts, different laminations and burrowing at the tops of tempestite layers. It has been suggested before that a tsunami occurred during the Late Devonian, but the Laurussian shelf had an extensional regime at the time, which excludes intensive seismic activity. The shelf environment also excluded the generation of tsunami waves because the depth was too shallow. Additionally, the Holy Cross Mountains region was surrounded in the Devonian by shallow-marine and stable elevated areas: the Nida Platform, the Opatkowice Platform and the Cracow Platform to the South, and the elevated Lublin-Lviv area to the NE. Thus, tsunami energy should have been absorbed by these regions if tsunamites would have occurred.

scholarly journals GEOMORPHOLOGICAL AND PALEOENVIRONMENTAL CHANGES OF ISMARIDA LAKE DURING HOLOCENE (N. GREECE)

2017 ◽  
Vol 50 (1) ◽  
pp. 424 ◽  
Author(s):  
G. Karadimou ◽  
K. Vouvalidis ◽  
G. Syrides ◽  
O. Koukousioura ◽  
E. Aidona
Keyword(s):  
Magnetic Susceptibility ◽  
Environmental Changes ◽  
High Energy ◽  
Low Energy ◽  
Magnetic Susceptibility Data ◽  
Shallow Marine ◽  
Susceptibility Data ◽  
Paleoenvironmental Changes ◽  
Archeological Site ◽  
Environmental Units

 In this research, the geomorphological and environmental changes of Lake Ismarida during Holocene are studied. Ismarida is located 20Km south of Komotini city and 5Km NNE of the archeological site of ancient Stryme at Rhodope Province, (N. Greece). The analysis of geomorphological, paleontological, sedimentological and magnetic susceptibility data as well as the evaluation of 14C datings, showed that four environmental units are recognized in the lake sediments. The environment changed from shallow marine to open lagoonal of low energy (~5400-3400 years BP), to shallow marine to open lagoonal of high energy (~3400-3000 years BP), subsequently turned into brackish to lagoonal with fresh water inputs (~3000-2000 years BP), and finally formed to fluvial-terrestrial, until present time. The Lake Ismarida as it is known today was formed 2000 years BP on the isolated western part of th pre-Holocene valley between the deltaic deposits of the rivers Filiouris and Vosvozis.

scholarly journals Stratigraphy and sedimentology of a basement-onlapping shallow marine sandstone succession, the Charcot Bugt Formation, Middle–Upper Jurassic, East Greenland

2003 ◽  
Vol 1 ◽  
pp. 893-930 ◽  
Author(s):  
Michael Larsen ◽  
Stefan Piasecki ◽  
Finn Surlyk
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Upper Jurassic ◽  
Sea Level Changes ◽  
Relative Sea Level ◽  
Western Basin ◽  
Shallow Marine ◽  
East Greenland ◽  
Depositional Systems

A rocky shore developed in early Middle Jurassic times by transgression of the crystalline basement in Milne Land at the western margin of the East Greenland rift basin. The basement is onlapped by shallow marine sandstones of the Charcot Bugt Formation, locally with a thin fluvial unit at the base. The topography of the onlap surface suggests that a relative sea-level rise of at least 300 m took place in Early Bathonian – Middle Oxfordian times. The sea-level rise was punctuated by relative stillstands and falls during which progradation of the shoreline took place. Palynological data tied to the Boreal ammonite stratigraphy have greatly improved time resolution within the Charcot Bugt Formation, and the Jurassic succession in Milne Land can now be understood in terms of genetically-related depositional systems with a proximal to distal decrease in grain size. The sequence stratigraphic interpretation suggests that translation of the depositional systems governed by relative sea-level changes resulted in stacking of sandstone-dominated falling stage deposits in the eastern, basinwards parts of Milne Land, whereas thick, remarkably coarsegrained transgressive systems tract deposits formed along the western basin margin. The bulk of the Charcot Bugt Formation consists of stacked sandstone-dominated shoreface units that prograded during highstands. The overall aggradational to backstepping stacking pattern recognised in the Charcot Bugt Formation is comparable to that in the contemporaneous Pelion Formation of the Jameson Land Basin and in correlative units of the mid-Norway shelf and the Northern North Sea. We suggest that the long-term evolution of the depositional systems may have been controlled by long-term eustatic rise acting in concert with relative sea-level changes reflecting regionally contemporaneous phases of rift initiation, climax and gradual cessation of rifting.

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