Mud-Rich Density-Driven Flows Along an Early Ordovician Storm-Dominated Shoreline: Implications for Shallow-Marine Facies Models

2015 ◽  
Vol 85 (5) ◽  
pp. 509-528 ◽  
Author(s):  
D. Harazim ◽  
D. McIlroy
Keyword(s):  
Shallow Marine ◽  
Early Ordovician ◽  
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.

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