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10 results for “mat-forming”
Fig. 6 in Mat-forming coccoid cyanobacteria from early Silurian marine deposits of Sudetes, Poland
Fig. 6. Schematic drawing showing examples of vegetative cells of different age and baeocytes formation in modern colonial coccoid cyanobacteria. A. Stanieria sphaerica (Setchell and Gardner) Komárek and Anagnostidis 1986, scheme of baeocytes formation (after Komárek and Anagnostidis 1998). B–E. Stanieria cf. cyanosphaera (Komárek and Hindák) Komárek and Anagnostidis 1986, modern coccoid cyanobacteria grown in culture under irradiance level 20 µmol m–2 sec–1 at 22 (~0.5)oC. B. Cells of different age. C. Vegetative cells of different age. D. Baeocytes differentiation. · · E. Baeocytes liberation. After Komárek and Hindák from Silva and Pienaar 2000, modified. F. Chroococcidiopsis kashayi Friedmann 1961, various stage of baeocytic cell division (multiple fission), after Komárek and Anagnostidis 1998 modified. G. Fragment of early Silurian coccoid cyanobacterial mat. ZPAL Cy.1 GBŻ 49/1−4. Scale bars 20 µm.
Fig. 7 in Mat-forming coccoid cyanobacteria from early Silurian marine deposits of Sudetes, Poland
Fig. 7. Comparison of early Silurian coccoid cyanobacteria (left) from radiolarian cherts exposed at the Żdanów road−cut (Bardzkie Mountains) and modern coccoid cyanobacteria (right), all optical micrographs. A, C, E. Examples of cells of early Silurian Stanieria−like cyanobacteria at different stage of cell fission filled with minute reproductive cells (baeocytes). E. Optical micrographs with Nomarski illumination. A, C, E, ZPAL Cy.1 GBŻ 49/1−4. B, D, F. Mass culture of Stanieria cf. cyanosphaera (Komárek and Hindák) Komárek and Anagnostidis 1986, grown under irradiance level 20 µmol m–2 sec–1 at 22 · · (~0.5)oC, revealing spherical cells of varying size; some cells are filled with baeocytes (from Silva and Pienaar 2000, with publisher permission http://www.schweizerbart.de).
Fig. 3 in Mat-forming coccoid cyanobacteria from early Silurian marine deposits of Sudetes, Poland
Fig. 3. Optical micrographs of early Silurian radiolarian cherts from Żdanów in horizontal thin sections. A. Three globular aggregates of coccoid cyanobacteria forming mats visible in amorphous organic background. B–D. Magnified aggregates of variously degraded coccoid cyanobacteria showing different size of cells and mucilage sheaths. Some cells are filled with granular material resembling reproductive cells (baeocytes) of modern coccoid cyanobacteria. E, F. Magnified fragment of cyanobacterial colony (aggregate), partly degraded, showing individual cells. F. Optical micrographs with Nomarski illumination. All ZPAL Cy.1 GBŻ 49/1−4.
Fig. 2 in Mat-forming coccoid cyanobacteria from early Silurian marine deposits of Sudetes, Poland
Fig. 2. Optical micrographs of Early Silurian radiolarian cherts from Żdanów in vertical thin sections. A–C. Sections of black radiolarian chert in different magnifications showing well−defined laminae of organic matter composed of coccoid cyanobacterial biomass. D. A fragment of dense organic lamina, in which no details are visible. E, F. Magnified fragment of organic laminae composed of partly degraded and compacted aggregates of coccoid cyanobacteria, some capsule−like remnants of mucilage sheaths remaind uncompacted. A–C, ZPAL Cy.1 GBŻ 49/1–4; D, ZPAL Cy.1 GBŻ 16/2; E, F, ZPAL Cy.1 GBŻ 23/1.
Fig. 1 in Mat-forming coccoid cyanobacteria from early Silurian marine deposits of Sudetes, Poland
Fig. 1. Geological map of the northern part of the Bardzkie Mountains (Sudetes, southwestern Poland) and stratigraphic section of the Early Palaeozoic deposits at the Żdanów road−cut (after Porębska 1982, and Wyżga 1987; modified).
Fig. 8 in Mat-forming coccoid cyanobacteria from early Silurian marine deposits of Sudetes, Poland
Fig. 8. Diagram showing effect of compaction of a coccoid cyanobacterial aggregate. A–C. 3D aggregate without compaction (A) and under different degree of compaction. D–G. Axial vertical section of the same aggregate without compaction (D) and under different degree of compaction; note that in G outlines of cells and/or capsules are no more identifiable. Not to scale.
Fig. 5 in Mat-forming coccoid cyanobacteria from early Silurian marine deposits of Sudetes, Poland
Fig. 5. Scanning electron microscope (SEM) image of early Silurian subspherical aggregate of benthic coccoid cyanobacteria from Żdanów in horizontal thin section (sample IV–VI 49), showing HF−etched pattern with extending parts representing silicified common mucilage sheats (glycocalyx) and pits representing decomposed cells.
Fig. 4 in Mat-forming coccoid cyanobacteria from early Silurian marine deposits of Sudetes, Poland
Fig. 4. Size−frequency histogram of cells from the early Silurian mats.
Data from: Xianella: a new mat-forming calcified cyanobacterium from the Middle–Late Ordovician of North China
Xianella hongii gen. et sp. nov. is described from the Middle–Late Ordovician of Shaanxi, China and interpreted as a calcified cyanobacterial sheath. Xianella filaments formed cable-like strands that constructed thick fenestral layers. The specimens occur in metre-sized limestone blocks, possibly derived from local collapse of a reefal platform margin. In combination with micrite, some of which is intraclastic and peloidal, Xianella created thick and extensive stacks of layered calcified fenestral fabric that appear to be synsedimentarily calcified open-frame mat deposits. The fenestrae range from small, laminose and very irregular, to large equidimensional areas ~2 cm across. Fenestrae with rounded outlines resemble primary gas bubbles observed in present-day microbial mats. These delicate fabrics are comparable in structure and quality of preservation with those of some Proterozoic silicified stromatolitic mats.
Data from: Xianella: a new mat-forming calcified cyanobacterium from the Middle–Late Ordovician of North China
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