The Role of Ichnology in Refining Shallow Marine Facies Models

2008 ◽  
pp. 73-116 ◽  
Author(s):  
JAMES A. MacEACHERN ◽  
KERRIE L. BANN
Keyword(s):  
Shallow Marine ◽  
Marine Facies ◽  
Facies Models

Nummulites Fayumensis N. Sp. and Nummulites Tenuissimus N. Sp. from Munquar El-rayan, Fayum, Egypt

2018 ◽  
Vol 48 (1) ◽  
pp. 17-28 ◽  
Author(s):  
Safia Al Menoufy ◽  
Mohamed Boukhary
Keyword(s):  
New Species ◽  
Foraminiferal Assemblage ◽  
Shallow Marine ◽  
Marine Facies ◽  
Benthic Foraminiferal Assemblage ◽  
Insight Into ◽  
Important Site

Abstract Nummulites fayumensis n. sp. and Nummulites tenuissimus n. sp. are described from the Munqar El-Rayan Section, Fayum, Egypt. Nummulites tenuissimus belongs to the N. partschi group, while N. fayumensis belongs to the N. gizehensis group, based on diameter and protoconch sizes, septal shape and granulations. Both new species are of Lutetian age, assigned to SBZ14/15, and encountered in shallow-marine facies. Wadi El-Rayan is an important site for vertebrate fossils in Egypt and the abundant larger benthic foraminiferal assemblage provides insight into paleoenvironmental parameters associated with the deposition of Eocene-age rock units of the Munqar El-Rayan Section.

High resolution linkage of channel-coastal plain and shallow marine facies belts, Desert Member to Lower Castlegate Sandstone stratigraphic interval, Book Cliffs, Utah-Colorado, USA

2019 ◽  
Vol 131 (9-10) ◽  
pp. 1643-1672 ◽  
Author(s):  
Simon A.J. Pattison
Keyword(s):  
Coastal Plain ◽  
Sediment Supply ◽  
Data Set ◽  
Shallow Marine ◽  
Book Cliffs ◽  
Marine Facies ◽  
Sequence Boundaries ◽  
Allogenic Processes ◽  
Stacking Patterns ◽  
Order Sequence

AbstractThe Campanian Desert Member and Lower Castlegate Sandstone in the Book Cliffs of east-central Utah to western Colorado, USA, has served as a foundational data set in the development of sequence stratigraphy. Contrary to previous work, no third-order sequence boundaries are recognized. These were originally thought to partition the neighboring coastal plain and shallow marine facies belts into separate systems tracts, unlinked in time or space. In contrast, adjoining channel-coastal plain and shallow marine facies belts are genetically-, temporally-, and spatially-related. Evidence includes the (i) synchronous, strongly progradational stacking patterns within each facies belt, (ii) gradational and conformable transitions between adjoining facies belts, accentuated by the ubiquity of flat-topped, rooted foreshore sandstones passing upwards into carbonaceous-rich-mudstone-dominated coastal plain, (iii) parasequence-scale interfingering of coastal plain-channel and foreshore-shoreface deposits, with channels, white caps and coals embedded within stacked shoreface parasequences, (iv) regional correlation of coals and flooding surfaces, and (v) near orthogonal paleocurrent relationship between channels and shorelines. Terminal channels incise into proximal foreshore-shoreface sandstones in most Desert-Castlegate parasequences. Incisions are generally confined to the parasequence in which the channels are nested, rarely cutting deeper. These shoreface-incised channels are cut and filled at a parasequence-scale, and are bounded above by the same flooding surface that caps each foreshore-shoreface package. The ubiquity of ascending regressive shoreface trajectories and near absence of descending regressive trajectories that intersect depositional slope argues against any significant sea level fall. Increased rates of sediment supply, driven by autogenic and/or allogenic processes, likely generated the strongly progradational Desert-Castlegate great tongue of sandstone.

Tectonic and climatic controls on a Mesozoic forearc basin succession, Alexander Island, Antarctica

2002 ◽  
Vol 139 (3) ◽  
pp. 313-330 ◽  
Author(s):  
GARY J. NICHOLS ◽  
DAVID J. CANTRILL
Keyword(s):  
Facies Analysis ◽  
Fossil Plants ◽  
Forearc Basin ◽  
Gradual Reduction ◽  
Shallow Marine ◽  
Continental Deposits ◽  
Deformation Event ◽  
Marine Facies ◽  
Land Deformation ◽  
The Antarctic

The Cretaceous Fossil Bluff Group on Alexander Island, on the west side of the Antarctic Peninsula, contains a remarkably complete record of the evolution of a forearc basin. The latest (Aptian–Albian) stages in the basin history are recorded in a well-exposed succession at the southern end of the island, where a series of nunataks provide exposure of over a thousand metres of shallow marine and continental deposits. An abrupt facies shift from upper shoreface marine facies to braided fluvial deposits is interpreted as the record of regional uplift in the volcanic arc. This event coincides with the Palmer Land deformation event which may be related to a mid-Cretaceous mantle plume. A gradual reduction in depositional gradient and a return to shallow marine conditions towards the top of the exposed section is interpreted as a consequence of erosion of the arc and subsidence within the basin. Palaeocurrent data and facies distributions indicate that the continental deposits formed a fan-shaped wedge at least 30 km in diameter in the southern part of the forearc basin. Fossil plants indicate that the palaeoclimate was warm and humid throughout the period of deposition. Mapping and facies analysis of the upper part of the Fossil Bluff Group in southern Alexander Island has resulted in a revision of the stratigraphic terminology for the area. The Triton Point Member, formerly part of the Neptune Glacier Formation, has been raised to formation status and two members (the Citadel Bastion Member and the Coal Nunatak Member) and a Bed (the Upper Coal Nunatak Sandstone Bed) are defined here within the formation.

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