Comparing the Upper Triassic Deep Sea Flysch of the Shannan Terrane with the Coeval Shallow Shelf Sediments of the Tethys Himalaya, Southern Tibet

Author(s):  
Xianghui Li ◽  
Frank MATTERN
Ichnos ◽  
2009 ◽  
Vol 16 (3) ◽  
pp. 179-185 ◽  
Author(s):  
Andreas Wetzel ◽  
Alfred Uchman ◽  
Ingo Blechschmidt ◽  
Albert Matter
Keyword(s):  
Deep Sea ◽  

2005 ◽  
Vol 42 (3) ◽  
pp. 259-272 ◽  
Author(s):  
Hugues Longuépée ◽  
Pierre A Cousineau

The Cambrian Anse Maranda Formation is a glauconite-bearing clastic succession within the Quebec Reentrant. It is part of the Appalachians Humber Zone, particularly of the shale – feldspathic sandstone assemblage, which represents the rift-to-drift deposits of the Laurentian margin. The massive sandstones of the Anse Maranda were originally interpreted as the proximal turbidites of a deep-sea fan. The occurrence of glauconite and the high degree of bioturbation, which give the sandstones a massive aspect, suggest a different depositional environment. Detailed ichnology and lithofacies descriptions indicate that the Anse Maranda predominantly represents shelf sediments deposited in storm-influenced environment and that intense bioturbation destroyed most of the sedimentary structures. The paleo geographic reconstruction suggests that the Anse Maranda was deposited seaward of a headland identified as the Montmorency Promontory, along a narrow shelf with an irregular topography. Some coeval turbidites of similar composition were deposited in the deeper sub-basins. This reconstruction allows for sustained sediment-starved conditions to be maintained for more than 10 Ma and to produce anomalously thick glauconite-bearing succession. The bioturbation has influenced the diagenetic evolution of the Anse Maranda Formation. The laminated sandstones and burrows were cemented by early calcite, while the microporosity of the bioturbated sandstones lasted longer and permitted the formation of a muddy pseudomatrix.


2005 ◽  
Vol 26 (1) ◽  
pp. 21-32 ◽  
Author(s):  
Chengshan Wang ◽  
Xiumian Hu ◽  
Massimo Sarti ◽  
Robert W. Scott ◽  
Xianghui Li

2021 ◽  
Vol 755 ◽  
pp. 149-190
Author(s):  
Andy S. Gale ◽  
John W.M. Jagt

Fossils assigned to the predominantly deep-sea asteroid family Benthopectinidae Verrill, 1894 are described and their affinities reappraised. Detailed comparative morphology of ambulacrals, adambulacrals and marginal ossicles has revealed that only some extinct taxa fall within the morphological range of the modern representatives of the family. These include Jurapecten hessi Gale, 2011, J. infrajurensis sp. nov. (both Jurassic), J. dhondtae sp. nov. (Upper Cretaceous) and Nearchaster spinosus (Blake, 1973) comb. nov. (Lower Oligocene). A new Late Cretaceous genus, Punkaster gen. nov. (P. spinifera gen. et sp. nov. and P. ruegenensis gen. et sp. nov.), appears to be a highly derived benthopectinid. A possible benthopectinid is described from the Upper Triassic (Carnian) of China. Other described records are distantly related to, but convergent in gross morphology with, benthopectinids. Thus, Plesiastropecten hallovensis Peyer, 1944 is here referred to the Jurassic spinulosidan family Plumasteridae Gale, 2011 and Xandarosaster hessi Blake, 1984 is interpreted as Spinulosida Perrier, 1884 incertae sedis. The mid-Cretaceous Alkaidia sumralli Blake & Reid, 1998 is reassigned to the Forcipulatida (Zorocallina). The “fossil benthopectinid” of Spencer & Wright in Moore (1966) is shown to belong to the goniopectinid genus Chrispaulia Gale, 2005, of which two new Cretaceous species are described, C. wrightorum sp. nov. and C. spinosa sp. nov. Finally, we consider Henricia? venturana Durham & Roberts, 1948 to be an indeterminate asteroid.


Sign in / Sign up

Export Citation Format

Share Document