Architecture and Paleoenvironment of Mid-Jurassic Microbial–Siliceous Sponge Mounds, Northeastern Spain

2019 ◽  
Vol 89 (2) ◽  
pp. 110-134
Author(s):  
Sara Tomás ◽  
Marcos Aurell ◽  
Beatriz Bádenas ◽  
Merle Bjorge ◽  
María Duaso ◽  
...  
Keyword(s):  
Siliceous Sponge

Carbon Replicas of Siliceous Sponge Spicules

Science ◽  
1967 ◽  
Vol 157 (3788) ◽  
pp. 581-582
Author(s):  
Ryan W. Drum
Keyword(s):  
Siliceous Sponge ◽  
Sponge Spicules ◽  
Carbon Replicas

The first well-preserved radiolarians from the Ordovician of Australia

1986 ◽  
Vol 60 (1) ◽  
pp. 145-157 ◽  
Author(s):  
B. D. Webby ◽  
W. M. Blom
Keyword(s):  
New Species ◽  
Debris Flows ◽  
New South ◽  
New South Wales ◽  
Late Ordovician ◽  
Siliceous Sponge ◽  
Radiolarian Assemblage ◽  
South Wales ◽  
Limestone Breccia

Late Ordovician radiolarians are described from allochthonous limestone breccia deposits of the graptolitic Malongulli Formation of central New South Wales. Included among the forms are the new ‘palaeoactinommid’ genus Kalimnasphaera with new species K. maculosa, the new entactiniid species, Entactinia subulata, and the new anakrusid species, Auliela taplowensis. A number of other entactiniids and the first recorded Ordovician ‘rotasphaerids’ are placed in open nomenclature. Graptolite faunas of the Malongulli Formation indicate that the deposits range in age from the Eastonian Zone of Dicranograptus hians kirki to the Bolindian Zone of Climacograptus uncinatus, that is, from latest Caradoc to early or middle Ashgill in age. This is only the second known well-preserved radiolarian assemblage to be illustrated from Late Ordovician (late Caradoc–Ashgill) successions, and the earliest known from Australia. The radiolarians typically occur in tabularly shaped, laminated lime-mudstone clasts with an abundance of siliceous sponge remains. These clasts appear to be formed from peri-platform ooze of the ‘deeper-water’ slope facies, which became incorporated in debris flows moving into the adjoining basin.

Siliceous sponge expansion and phosphogenesis in a shallow water environment in the Malyi Karatau Range (Kazakhstan) during the Precambrian-Cambrian transition

2020 ◽  
Vol 347 ◽  
pp. 105830
Author(s):  
Michael Tatzel ◽  
Maria Stuff ◽  
Gerhard Franz ◽  
Dorothee Hippler ◽  
Uwe Wiechert ◽  
...  
Keyword(s):  
Shallow Water ◽  
Water Environment ◽  
Siliceous Sponge ◽  
Shallow Water Environment

Occurrence of the siliceous sponge spicule Konyrium (Hexactinellida) in the upper Cambrian of the Mackenzie Mountains, northwestern Canada

2002 ◽  
Vol 76 (3) ◽  
pp. 565-569 ◽  
Author(s):  
Brian R. Pratt
Keyword(s):  
Fossil Record ◽  
Southern China ◽  
South Australia ◽  
Early Cambrian ◽  
Siliceous Sponge ◽  
Sponge Spicule ◽  
Animal Phyla ◽  
Sponge Diversity ◽  
Siliceous Sponges ◽  
Late Neoproterozoic

The fossil record of siliceous sponges—Hexactinellida and demosponge “Lithistida”—hinges upon both body fossils plus isolated spicules mostly recovered from limestones by acid digestion. The earliest record of siliceous sponge spicules extends back to the late Neoproterozoic of Hubei, southern China (Steiner et al., 1993) and Mongolia (Brasier et al., 1997), and body fossils attributed to the hexactinellids have been described from the Ediacaran of South Australia (Gehling and Rigby, 1996); thus they are the oldest-known definite representatives of extant animal phyla. The Early Cambrian saw a remarkable diversification in spicule morphology, with the appearance of an essentially “modern” array of forms (Zhang and Pratt, 1994). While a diversity decline may have occurred with the late Early Cambrian extinction(s), the subsequent Paleozoic and Mesozoic fossil record of spicules shows a relatively consistent range of morphologies (e.g., Mostler, 1986; Bengtson et al., 1990; Webby and Trotter, 1993; Kozur et al., 1996; Zhang and Pratt, 2000). However, because spicule form is not restricted to individual taxa and many sponge species secrete a variety of spicule shapes, it is difficult to gauge true siliceous sponge diversity and to explore their biostratigraphic utility using only isolated spicules.

Diagenesis of siliceous sponge limestones from the pleistocene of the Tyrrhenian sea (Mediterranean sea)

Facies ◽  
1987 ◽  
Vol 17 (1) ◽  
pp. 41-49 ◽  
Author(s):  
Thomas C. Brachert ◽  
Wolf-Christian Dullo ◽  
Peter Stoffers
Keyword(s):  
Mediterranean Sea ◽  
Tyrrhenian Sea ◽  
Siliceous Sponge
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