scholarly journals Dinoflagellate cyst biostratigraphy, palynofacies, depositional environment and sequence stratigraphy of the Agardhfjellet Formation (Upper Jurassic–Lower Cretaceous) in central Spitsbergen (Arctic Norway)

2016 ◽  
Author(s):  
Thine Sanne Dalseg ◽  
Hans Arne Nakrem ◽  
Morten Smelror
Keyword(s):  
Sequence Stratigraphy ◽  
Lower Cretaceous ◽  
Depositional Environment ◽  
Upper Jurassic ◽  
Dinoflagellate Cyst

scholarly journals <i>Rotosphaeropsis thula</i> (Davey 1982) comb. nov., emend.: a dinoflagellate cyst from the Upper Jurassic-Lower Cretaceous of England

1989 ◽  
Vol 8 (1) ◽  
pp. 109-112 ◽  
Author(s):  
James B. Riding ◽  
Roger J. Davey
Keyword(s):  
Lower Cretaceous ◽  
Upper Jurassic ◽  
Morphological Parameters ◽  
Specific Diagnosis ◽  
Dinoflagellate Cyst

Abstract. The Upper Jurassic-Lower Cretaceous dinoflagellate cyst Cannosphaeropsis thula Davey 1982 does not conform to the morphological parameters of the genus Cannosphaeropsis O. Wetzel 1933 emend. Duxbury 1980. The species also exhibits no indications of belonging to the Spiniferites complex of Evitt (1985). The species is transferred to Rotosphaeropsis Davey 1987 by virtue of its shape, archaeopyle type, processes and trabeculae and the specific diagnosis is emended in the light of this reassessment.

Pliocene dinoflagellate cyst stratigraphy, palaeoecology and sequence stratigraphy of the Tunnel-Canal Dock, Belgium

2008 ◽  
Vol 146 (1) ◽  
pp. 92-112 ◽  
Author(s):  
STIJN DE SCHEPPER ◽  
MARTIN J. HEAD ◽  
STEPHEN LOUWYE
Keyword(s):  
Sequence Stratigraphy ◽  
Depositional Environment ◽  
Open Water ◽  
Marine Waters ◽  
Depositional Sequence ◽  
Dinoflagellate Cyst ◽  
Water Influence ◽  
Accommodation Space ◽  
Warm Temperate ◽  
Harbour Area

AbstractDinoflagellate cysts and sequence stratigraphy are used to date accurately the Tunnel-Canal Dock section, which contains the most complete record of marine Pliocene deposits in the Antwerp harbour area. The Zanclean Kattendijk Formation was deposited between 5.0 and 4.4 Ma during warm-temperate conditions on a shelf influenced by open-marine waters. The overlying Lillo Formation is divided into four members. The lowest is the Luchtbal Sands Member, estimated to have been deposited between 3.71 and 3.21 Ma, under cooler conditions but with an open-water influence. The Oorderen Sands, Kruisschans Sands and Merksem Sands members of the Lillo Formation are considered a single depositional sequence, and biostratigraphically dated between 3.71 andc. 2.6 Ma, with the Oorderen Sands Member no younger than 2.72–2.74 Ma. Warm-temperate conditions had returned, but a cooling event is noted within the Oorderen Sands Member. Shoaling of the depositional environment is also evidenced, with the transgressive Oorderen Sands Member passing upwards into (near-)coastal high-stand deposits of the Kruisschans Sands and Merksem Sands members, as accommodation space decreased. Applying sequence stratigraphy to our section implies that the Kattendijk/Lillo Formation boundary corresponds to the sequence boundary (SB) Za2 (4.04 Ma), the Luchtbal/Oorderen sands boundary to SB Pia1 (3.21 Ma), and the top of the Merksem Sands to SB Pia2 (2.76 Ma). Finally, the Belgian deposits are compared with marine Pliocene deposits of eastern England.

Palaeoenvironment, sequence stratigraphy and palaeogeography of the Lower Cretaceous deposits of Mehdi Abad, Yazd Block, Central Iran

2020 ◽  
Vol 295 (1) ◽  
pp. 61-89
Author(s):  
Mohammad Safaei ◽  
Asadollah Mahboubi ◽  
Soroush Modabberi ◽  
Reza Moussavi-Harami
Keyword(s):  
Sequence Stratigraphy ◽  
Coastal Plain ◽  
Tidal Flat ◽  
Lower Cretaceous ◽  
Depositional Environment ◽  
Carbonate Platform ◽  
Depositional Environments ◽  
Sea Level Changes ◽  
Deep Basin

Four Lower Cretaceous sections in the southern Yazd Block were measured and studied to interpret the palaeoenvironments, synsedimentary tectonics, and sequence stratigraphy. The Early Cretaceous sedimentary record of this block, consisting of the Sangestan, Taft, Abkuh, and Darreh Zanjir formations, was mainly influenced by synsedimentary tectonic activities in a tectonically unstable basin. Field observations and laboratory studies were used to identify lithofacies and microfacies, based on which six depositional environments were identified: upper coastal plain (alluvial fans), shore, tidal flat, lagoon, shoal, and open marine. A carbonate-siliciclastic shallow platform including an alluvial-coastal plain and an inner platform is suggested for the depositional environment of the Sangestan Formation. The depth of the overall shallow sedimentary basin of Sangestan Formation increases from west to east and deposition was controlled by long- term sea-level changes. A carbonate platform consisting of inner and outer parts, including tidal flat, lagoon, open marine belts, is suggested for the depositional environment of the Taft and Abkuh formations, while the Darreh Zanjir Formation accumulated in a deep basin. The predominant facies demonstrate an overall transgression-regression cycle (the 2rd order cycle) during the depositional time of these formations in the southern Yazd Block.

scholarly journals Sedimentology and stratigraphy of the Middle Jurassic - Lower Cretaceous rocks of the Wollaston Forland - Kuhn Ø area, central East Greenland

1975 ◽  
Vol 75 ◽  
pp. 110-115
Author(s):  
F Surlyk ◽  
L.B Clemmensen
Keyword(s):  
Lower Cretaceous ◽  
Middle Jurassic ◽  
Depositional Environment ◽  
Sedimentary Facies ◽  
Upper Jurassic ◽  
Tectonic Activity ◽  
Sedimentary Sequence ◽  
East Greenland

The present investigation was carried out in order to gain information concerning the stratigraphy and sedimentology of the Upper Jurassic and Lower Cretaceous sediments in central Bast Greenland (fig. 27). We were especially interested in the following topics: (1) To delineate sedimentary facies and interpret their depositional environment. (2) To erect a strict lithostratigraphical scheme for the sedimentary sequence. (3) To date the tectonic activity controlling the sedimentation at the Jurassic-Cretaceous boundary.

Sign in / Sign up

Export Citation Format

Share Document