1-20 OF 21 RESULTS FOR

girvanella

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Journal: PALAIOS
Published: 01 December 2015
PALAIOS (2015) 30 (12): 836–845.
... contain dense accumulations of large (10 × 300 μ m) filamentous Girvanella microfossils. Many laminae are not spherical, often occurring with one flat side opposite a conical peak. Up to six generations of conical geometry are present, with each cone rotated with respect to the previous peak. We...
FIGURES | View All (6)
Journal Article
Journal: PALAIOS
Published: 01 January 2014
PALAIOS (2014) 29 (1): 27–37.
... components and siliceous sponges co-occur. The maze-like structures consist of microbial components such as microstromatolites, Girvanella , and Renalcis -like forms, as well as sponge spicule networks, whereas lime mud and bioclasts occupy the space between the structures. The maze-like structures developed...
FIGURES | View All (8)
Journal Article
Journal: Geology
Published: 01 September 2012
Geology (2012) 40 (9): 839–842.
... cyanobacteria ( Girvanella , Fig. 1C ) indicate a depositional depth within the photic zone. Shallow and deep-water seep faunas differed significantly in the warm, nearly isothermal early Late Cretaceous ocean ( Fig. 3 ), as they do in the modern ocean with its strong thermocline ( Dando, 2010...
FIGURES
Journal Article
Published: 18 July 2008
Canadian Journal of Earth Sciences (2008) 45 (6): 619–639.
... with encrusting Girvanella, eocrinoid plates, rhynchonelliformean brachiopod valves and subordinate hyoliths and trilobites in tempestite shell beds; these beds underwent synsedimentary cementation on the seafloor to form hardgrounds. In the succeeding, higher energy interval, a complex of metre-scale bioherms...
FIGURES | View All (11)
Journal Article
Journal: Geology
Published: 01 June 2002
Geology (2002) 30 (6): 579–580.
... that a considerable part of Paleozoic carbonate mud may have been derived from disintegrated micrite tubes considered to have been formed by calcified cyanobacteria. Such micritic tubes from many Paleozoic and Mesozoic carbonate rocks are known as Girvanella -type microfossils; most Proterozoic examples are less...
Journal Article
Journal: Geology
Published: 01 September 2001
Geology (2001) 29 (9): 763–766.
... organisms, and spontaneous whitings from either abiotic precipitation or calcification of suspended picoplankton and organic matter. The styles of occurrence of micrite- walled tubes referred to Girvanella in lower Paleozoic limestones argue that occasional permineralization of mucilaginous sheaths...
FIGURES
Journal Article
Journal: Geology
Published: 01 November 2000
Geology (2000) 28 (11): 987–990.
..., northwestern Australia, demonstrate, however, that a novel reef ecology was established in the immediate aftermath of the Frasnian-Famennian mass extinction. Here, diverse calcimicrobes (including Rothpletzella spp., Shuguria spp., Ortonella , and Girvanella ), together with bryozoans, brachiopods...
FIGURES
Journal Article
Published: 01 May 1998
Journal of Paleontology (1998) 72 (3): 577–584.
Journal Article
Journal: GSA Bulletin
Published: 01 July 1993
GSA Bulletin (1993) 105 (7): 883–896.
... study. Detailed lithofacies analysis of the Middle Cambrian Maryville Limestone along a shelf-to-basin depositional transect reveals that the shelf evolved from a gently basinward-sloping ramp to a rimmed platform fringed with steeper slopes. Cyanobacterial buildups ( Renalcis-Girvanella ) dominated...
Journal Article
Journal: Geology
Published: 01 March 1993
Geology (1993) 21 (3): 259–262.
... of three different calcareous microfossils. A tubule-thread microfossil, analogous to the calcimicrobe Girvanella in Paleozoic reefs, formed laminar-reticulate structures, like those in Ordovician bioherms. A clotted to saccate microfossil, comparable morphologically to Paleozoic Renalcis , constructed...
Journal Article
Journal: PALAIOS
Published: 01 October 1990
PALAIOS (1990) 5 (5): 460–471.
Journal Article
Published: 01 May 1990
Journal of Paleontology (1990) 64 (3): 340–352.
Journal Article
Journal: PALAIOS
Published: 01 February 1989
PALAIOS (1989) 4 (1): 51–62.
Journal Article
Published: 01 September 1985
Journal of Sedimentary Research (1985) 55 (5): 735–745.
Journal Article
Published: 01 September 1985
Journal of Sedimentary Research (1985) 55 (5): 746–754.
...Mario Coniglio; Noel P. James Abstract Calcified algae are important elements of deep-water carbonate sediments in the Cow Head Group. Large algal boundstone boulders in debris-flow conglomerates consist of Girvanella sheets and arborescent clusters of Epiphyton . Silt- and sand-sized particles...
Journal Article
Published: 01 September 1984
Journal of Sedimentary Research (1984) 54 (3): 948–971.
Journal Article
Journal: AAPG Bulletin
Published: 01 April 1984
AAPG Bulletin (1984) 68 (4): 464–465.
...-water clasts within both conglomerates and deep-water slope sediments. Large boulders contain sheets of Girvanella and arborescent clusters of Epiphyton , but only Girvanella as intraclasts, rafts of intertwined tubules, single tubules, and oncolites can be distinguished in calcarenites. Preservation...
Journal Article
Published: 01 September 1983
Journal of Sedimentary Research (1983) 53 (3): 761–778.
... masses into foreslope-slope settings. Generation 3 geopetals of dolomite silt, which rests on earlier calcite cement and is postdated by saddle dolomite, formed during deep burial and deformation of the sequence. Reefal blocks are composed of Epiphyton and Girvanella boundstone, thrombolites...
Journal Article
Journal: GSA Bulletin
Published: 01 November 1981
GSA Bulletin (1981) 92 (11): 799–811.
..., cement, and fine-grained sediment. The predominant algae are Epiphyton spp., occurring as numerous masses of tiny shrublike and clumplike growths, and Girvanella spp., developed as numerous thin strands and arcuate sheets. Renalcis spp. and stromatolitic algae, although locally common, are not persistent...
Journal Article
Published: 01 December 1967
Journal of Sedimentary Research (1967) 37 (4): 1045–1051.
...Karl W. Klement; Donald Francis Toomey Abstract Marginal grain corrosion on calcareous grains present in the Lower Ordovician (El Paso Group) mound carbonates of west Texas, appears to be caused by the boring and perforating action of the primitive filamentous blue-green alga Girvanella...