1-20 OF 529 RESULTS FOR

Discoaster

Results shown limited to content with bounding coordinates.
Save search
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

Discoaster praebifax n. sp.; a possible ancestor of Discoaster bifax Bukry (Coccolithophoridae) Free

Wuchang Wei, Sherwood W. Wise
Published: 01 January 1989
Journal of Paleontology (1989) 63 (1): 10–14.
Add to Citation Manager for <span class="search-highlight">Discoaster</span> praebifax n. sp.; a possible ancestor of <span class="search-highlight">Discoaster</span> bifax Bukry (Coccolithophoridae)
Journal Article

Discoaster orbis nom. nov. pro Discoaster circularis Furrazola-Bermudez and Kreisel, 1972, non Hoffman, 1970 Free

David D. Reimers, Denise O. Daigre
Published: 01 March 1985
Journal of Paleontology (1985) 59 (2): 309.
Add to Citation Manager for <span class="search-highlight">Discoaster</span> orbis nom. nov. pro <span class="search-highlight">Discoaster</span> circularis Furrazola-Bermudez and Kreisel, 1972, non Hoffman, 1970
Journal Article

Biostratigraphy and evolution of Miocene Discoaster spp. from IODP Site U1338 in the equatorial Pacific Ocean Available to Purchase

Marina Ciummelli, Isabella Raffi, Jan Backman
Published: 07 December 2016
Journal of Micropalaeontology (2017) 36 (2): 137–152.
DOI: https://doi.org/10.1144/jmpaleo2015-034
...Marina Ciummelli; Isabella Raffi; Jan Backman Abstract Assemblages of upper lower through upper Miocene Discoaster spp. have been quantified from Integrated Ocean Drilling Program (IODP) Site U1338 in the eastern equatorial Pacific Ocean. These assemblages can be grouped into five broad...
FIGURES
First thumbnail for: Biostratigraphy and evolution of Miocene <span cla...
Second thumbnail for: Biostratigraphy and evolution of Miocene <span cla...
Third thumbnail for: Biostratigraphy and evolution of Miocene <span cla...
View PDF for article title, Biostratigraphy and evolution of Miocene <span class="search-highlight">Discoaster</span> spp. from IODP Site U1338 in the equatorial Pacific Ocean
Purchase
Add to Citation Manager for Biostratigraphy and evolution of Miocene <span class="search-highlight">Discoaster</span> spp. from IODP Site U1338 in the equatorial Pacific Ocean
Journal Article

Late Miocene-Early Pliocene Discoaster from Neill Island, South Andaman Available to Purchase

Pratap Singh, K. P. Vimal
Published: 01 March 1976
Jour. Geol. Soc. India (1976) 17 (1): 37–44.
DOI: https://doi.org/10.17491/jgsi/1976/170107
...Pratap Singh; K. P. Vimal Abstract The Eastern Coast Mudstone, exposed in Neill island, has yielded a rich assemblage of Late Miocene-Early Pliocene nannoplankton represented by the genera: Discoaster Tan Sin Hok, 1927 and Coccolithus Schwarz, 1894. The genus Discoaster constitutes about ninety...
View PDF for article title, Late Miocene-Early Pliocene <span class="search-highlight">Discoaster</span> from Neill Island, South Andaman
Purchase
Add to Citation Manager for Late Miocene-Early Pliocene <span class="search-highlight">Discoaster</span> from Neill Island, South Andaman
Journal Article

Discoaster evolutionary trends Available to Purchase

David Bukry
Published: 01 January 1971
Micropaleontology (1971) 17 (1): 43–52.
View PDF for article title, <span class="search-highlight">Discoaster</span> evolutionary trends
Purchase
Add to Citation Manager for <span class="search-highlight">Discoaster</span> evolutionary trends
Journal Article

Discoaster Extinction in Neritic Sediments, Northern Gulf of Mexico: GEOLOGICAL NOTES Available to Purchase

John L. Wray, C. Howard Ellis
Journal: AAPG Bulletin
Published: 01 January 1965
AAPG Bulletin (1965) 49 (1): 98–99.
DOI: https://doi.org/10.1306/A66334EE-16C0-11D7-8645000102C1865D
...John L. Wray; C. Howard Ellis The zone of extinction of discoasters in neritic sediments in the northern Gulf of Mexico is marked by two separate discoaster horizons about 150–500 feet apart ( Fig. 1 ). The lower of these two horizons is characterized by the last occurrence of several species...
FIGURES
First thumbnail for: <span class="search-highlight">Discoaster</span> E...
View PDF for article title, <span class="search-highlight">Discoaster</span> Extinction in Neritic Sediments, Northern Gulf of Mexico: GEOLOGICAL NOTES
Purchase
Add to Citation Manager for <span class="search-highlight">Discoaster</span> Extinction in Neritic Sediments, Northern Gulf of Mexico: GEOLOGICAL NOTES
Journal Article

Discoasters of the Blue Clay (middle Miocene) of Malta and Gozo Free

M. Hojjatzadeh
Published: 01 January 1978
Geological Magazine (1978) 115 (1): 1–19.
Add to Citation Manager for <span class="search-highlight">Discoasters</span> of the Blue Clay (middle Miocene) of Malta and Gozo
Journal Article

Stratigraphic value of discoasters and some other microfossils related to Recent coccolithophores Free

Milton Nunn Bramlette, William R. Riedel
Published: 01 July 1954
Journal of Paleontology (1954) 28 (4): 385–403.
Add to Citation Manager for Stratigraphic value of <span class="search-highlight">discoasters</span> and some other microfossils related to Recent coccolithophores
Image
1, Discoaster deflandrei (sample U1338C-46H-2, 45 – 46 cm). 2, Intergrading form Discoaster deflandrei–Discoaster variabilis (sample U1338C-31H-3, 122 – 123 cm). 3, Discoaster aulakos (sample U1338B-26H-5, 120 – 121 cm). 4, Discoaster divaricatus (sample U1338C-44H-2, 120 – 121 cm). 5, Discoaster woodringi (sample U1338C-46H-5, 45 – 46 cm). 6, Discoaster signus (sample U1338C-39H-2, 122 – 123 cm). 7, Discoaster cf. signus (sample U1338C-41H-6, 44 – 45 cm). 8, Discoaster exilis (sample U1338A-25H-2, 80 – 81 cm). 9, Discoaster cf. exilis (sample U1338B-42H-4, 45 – 46 cm). 10, Discoaster variabilis (sample U1338B-18H-4, 45 – 46 cm). 11, Intergrading form Discoaster variabilis–Discoaster exilis (sample U1338A-25H-3, 80 – 81 cm). 12, Discoaster icarus (sample U1338B-18H-6, 120 – 121 cm). 13, Intergrading form Discoaster variabilis–Discoaster icarus (sample U1338B-16H-3, 120 – 121 cm). 14, Discoaster cf. bollii (sample U13384 – 24H-4, 58 – 59 cm). 15, Discoaster surculus (sample U1338A-24H, CC). 16, Discoaster loeblichii (sample U1338A-18H-6, 45 – 46 cm). 17 – 18, Discoaster kugleri (sample U1338B-28H-6, 45 – 46 cm). 19 – 20, Discoaster musicus (19 – sample U1338A-25H-4, 120 – 121 cm; 20 – sample U1338B-33H-5, 45 – 46 cm). Scale bar 5 μm.

1 , Discoaster deflandrei (sample U1338C-46H-2, 45 – 46 cm). 2 , Intergr... Available to Purchase

Published: 07 December 2016
Fig. 1. 1 , Discoaster deflandrei (sample U1338C-46H-2, 45 – 46 cm). 2 , Intergrading form Discoaster deflandrei – Discoaster variabilis (sample U1338C-31H-3, 122 – 123 cm). 3 , Discoaster aulakos (sample U1338B-26H-5, 120 – 121 cm). 4 , Discoaster divaricatus (sample U1338C-44H-2
Image
1, Discoaster brouweri (sample U1338A-13H-3, 120 – 121 cm). 2, Discoaster cf. brouweri (sample U1338C-31H-3, 122 – 123 cm). 3, Discoaster intercalaris (sample U1338A-22H-5, 80 – 81 cm). 4, Intergrading form Discoaster variabilis–Discoaster intercalaris (sample U1338A-19H-5, 45 – 46 cm). 5, Discoaster brouweri &gt;20 µm (sample U1338A-13H-3, 120 – 121 cm). 6, Discoaster neorectus (sample U1338A-18H-5, 120 – 121 cm). 7, Discoaster neohamatus (sample U1338B-13H-2, 120 – 121 cm). 8, Discoaster bellus (sample U1338B-18H-5, 120 – 121 cm). 9, Intergrading form Discoaster bellus–Discoaster hamatus (sample U1338B-24H-3, 142 – 143 cm). 10, Discoaster hamatus (sample U188A-24H-2, 68 – 69 cm). 11 – 12, Intergrading form Discoaster bellus–Discoaster berggrenii (11 – sample U1338B-18H-5, 120 – 121 cm; 12 – sample U1338B-18H-4, 45 – 46 cm). 13 – 14, Discoaster berggrenii (13 – sample U133A-18H-6, 45 – 46 cm; 14 – sample U1338B-13H-2, 120 – 121 cm). 15, Discoaster quinqueramus (sample U1338B-13H-2, 120 – 121 cm). 16, Discoaster asymmetricus (sample U1338A-16H-3, 45 – 46 cm). 17, Discoaster moorei (sample U1338A-25H-3, 80 – 81 cm). 18 – 19, Discoaster pentaradiatus (sample U1338A-9H-5, 70 – 71 cm). 20, Discoaster prepentaradiatus (sample U1338A-21H-2, 66 – 67 cm). Scale bar 5 μm.

1 , Discoaster brouweri (sample U1338A-13H-3, 120 – 121 cm). 2 , Discoa... Available to Purchase

Published: 07 December 2016
Fig. 5. 1 , Discoaster brouweri (sample U1338A-13H-3, 120 – 121 cm). 2 , Discoaster cf. brouweri (sample U1338C-31H-3, 122 – 123 cm). 3 , Discoaster intercalaris (sample U1338A-22H-5, 80 – 81 cm). 4 , Intergrading form Discoaster variabilis–Discoaster intercalaris (sample U1338A-19H
Journal Article

Carbonate budget mass estimates for Neogene discoasters from the Equatorial Atlantic (Ceara Rise: ODP Site 927) Available to Purchase

Inga Preiss-Daimler, Karl-Heinz Baumann, Rüdiger Henrich
Published: 01 July 2012
Journal of Micropalaeontology (2012) 31 (2): 169–178.
DOI: https://doi.org/10.1144/0262-821X11-014
...Inga Preiss-Daimler; Karl-Heinz Baumann; Rüdiger Henrich Abstract Mass estimates for Late Miocene and Pliocene (8.6–3.25 Ma) Discoaster species and Sphenolithus are determined using samples of the equatorial Atlantic (Ceara Rise: ODP Site 927). Based on morphometric measurements, 3D computer models...
FIGURES
First thumbnail for: Carbonate budget mass estimates for Neogene <span ...
Second thumbnail for: Carbonate budget mass estimates for Neogene <span ...
Third thumbnail for: Carbonate budget mass estimates for Neogene <span ...
View PDF for article title, Carbonate budget mass estimates for Neogene <span class="search-highlight">discoasters</span> from the Equatorial Atlantic (Ceara Rise: ODP Site 927)
Purchase
Add to Citation Manager for Carbonate budget mass estimates for Neogene <span class="search-highlight">discoasters</span> from the Equatorial Atlantic (Ceara Rise: ODP Site 927)
Image
Sequence of Discoaster evolutionary events across the early/middle Miocene boundary at Site U1338, together with abundance data of D. deflandrei and D. variabilis. These changes represent the first major evolutionary transition among Miocene discoasters. Biozonations from Okada &amp; Bukry (1980) and Backman et al. (2012). Depth refers to compressed metres composited depth (see ‘Methods’ section). These changes represent the first major evolutionary transition among Miocene discoasters.

Sequence of Discoaster evolutionary events across the early/middle Miocen... Available to Purchase

Published: 07 December 2016
Fig. 3. Sequence of Discoaster evolutionary events across the early/middle Miocene boundary at Site U1338, together with abundance data of D. deflandrei and D. variabilis . These changes represent the first major evolutionary transition among Miocene discoasters. Biozonations from Okada
Image
Total abundance of Discoaster spp. (n mm−2) plotted v. age. The Mid Miocene Climatic Optimum onset and the East Antarctica Ice Sheet growth are indicated by arrows.

Total abundance of Discoaster spp. ( n  mm −2 ) plotted v. age. The Mid M... Available to Purchase

Published: 07 December 2016
Fig. 12. Total abundance of Discoaster spp. ( n  mm −2 ) plotted v. age. The Mid Miocene Climatic Optimum onset and the East Antarctica Ice Sheet growth are indicated by arrows.
Image
Plot revealing the poor correlation between total Discoaster abundance (n mm−2) and carbonate content (wt%) at Site U1338. All points over 440 specimens represent D. bellus.

Plot revealing the poor correlation between total Discoaster abundance ( ... Available to Purchase

Published: 07 December 2016
Fig. 13. Plot revealing the poor correlation between total Discoaster abundance ( n  mm −2 ) and carbonate content (wt%) at Site U1338. All points over 440 specimens represent D. bellus .
Image
Plot revealing the poor correlation between total Discoaster abundance (n mm−2) and oxygen isotopes (left panel) and carbon isotopes (right panel). Dotted line represents isotope data (Reghellin et al. 2015).

Plot revealing the poor correlation between total Discoaster abundance ( ... Available to Purchase

Published: 07 December 2016
Fig. 14. Plot revealing the poor correlation between total Discoaster abundance ( n  mm −2 ) and oxygen isotopes (left panel) and carbon isotopes (right panel). Dotted line represents isotope data ( Reghellin et al. 2015 ).
Image
Light microphotographies of the selected calcareous nannofossils reported in fig. 3 (scale bar is 10 micron): 1) Discoaster tamalis from sample SQ24; 2) Discoaster brouweri from sample SQ15; 3) Discoaster surculus from sample SQ15; 4) Discoaster pentaradiatus from sample SQ23; 5, 8) Discoaster intercalaris from samples SQ15 and SQ24, respectively; 6) Discoaster asymmetricus from sample SQ18; 7) Discoaster triradiatus from sample SQ18.

Light microphotographies of the selected calcareous nannofossils reported i... Available to Purchase

Published: 01 October 2016
Pl. 2 Light microphotographies of the selected calcareous nannofossils reported in fig. 3 (scale bar is 10 micron): 1) Discoaster tamalis from sample SQ24; 2) Discoaster brouweri from sample SQ15; 3) Discoaster surculus from sample SQ15; 4) Discoaster pentaradiatus from sample SQ23; 5
Image
Abundance of Catinaster mexicanus and Discoaster berggrenii in the Upper Miocene at IODP Site U1338. 1, 2. Catinaster mexicanus: 1, sample U1338B-18H-4, 50–51 cm; 2, sample U1338B-18H-4, 60–61 cm. 3, 4. Discoaster berggrenii: 3, sample U1338B-13H-2, 120-121 cm; 4, sample U1338B-13H-3, 45-46 cm. Magnification 1250×. Scale bars 5 µm.

Abundance of Catinaster mexicanus and Discoaster berggrenii in the Uppe... Available to Purchase

Published: 01 July 2013
Fig. 3. Abundance of Catinaster mexicanus and Discoaster berggrenii in the Upper Miocene at IODP Site U1338. 1, 2. Catinaster mexicanus : 1, sample U1338B-18H-4, 50–51 cm; 2, sample U1338B-18H-4, 60–61 cm. 3, 4. Discoaster berggrenii : 3, sample U1338B-13H-2, 120-121 cm; 4, sample U1338B
Image
Abundance of Catinaster mexicanus and Discoaster berggrenii in the Upper Miocene at ODP Site 845. 1–6. Catinaster mexicanus: 1, 2, same specimen at different focus (sample 845A-12H-2, 141–142 cm); 3, 4, sample 845A-12H-3, 42–43 cm; 5, 6, same specimen at different focus (sample 845A-12H-3, 42–43 cm). 7, 8. Discoaster berggrenii (sample 845A-12H-3, 42–43 cm). Magnification 1250×. Scale bars 5 µm.

Abundance of Catinaster mexicanus and Discoaster berggrenii in the Uppe... Available to Purchase

Published: 01 July 2013
Fig. 4. Abundance of Catinaster mexicanus and Discoaster berggrenii in the Upper Miocene at ODP Site 845. 1–6. Catinaster mexicanus : 1, 2, same specimen at different focus (sample 845A-12H-2, 141–142 cm); 3, 4, sample 845A-12H-3, 42–43 cm; 5, 6, same specimen at different focus (sample 845A
Image
Abundance of Catinaster mexicanus and Discoaster altus in the Lower Pliocene at IODP Site U1338. 1, 2. Catinaster mexicanus: 1, sample U1338B-6H-4, 120–121 cm; 2, sample U1338B-6H-5, 5–6 cm. 3–5. Discoaster altus with short rays: 3, sample U1338B-6H-5, 110–111 cm; 4, sample U1338B-6H-5, 90–91 cm; 5, sample U1338A-7H-6, 120–121 cm. 6-8. Discoaster altus with long rays: 6, sample U1338B-7H-5, 45–46 cm; 7, 8, same specimen at different focal levels (sample U1338B-7H-6, 70–71 cm). Magnification x1250. Scale bar 5 µm.

Abundance of Catinaster mexicanus and Discoaster altus in the Lower Pli... Available to Purchase

Published: 01 July 2013
Fig. 6. Abundance of Catinaster mexicanus and Discoaster altus in the Lower Pliocene at IODP Site U1338. 1, 2. Catinaster mexicanus : 1, sample U1338B-6H-4, 120–121 cm; 2, sample U1338B-6H-5, 5–6 cm. 3–5. Discoaster altus with short rays: 3, sample U1338B-6H-5, 110–111 cm; 4, sample U1338B
Image
Models (left) and SEM pictures of Discoaster groups (right) with increasing ks: 1.D. pentaradiatus;2.D. exilis;3.D. calcaris;4.D. quinqueramus;5.D. hamatus;6.D. brouweri;7.D. surculus;8.D. bellus;9.D. variabilis;10.D. berggrenii, Sphenolithus abies, Discoaster bergenii.

Models (left) and SEM pictures of Discoaster groups (right) with increasi... Available to Purchase

Published: 01 July 2012
Explanation of Plate 1. Models (left) and SEM pictures of Discoaster groups (right) with increasing k s : 1. D. pentaradiatus; 2. D. exilis; 3. D. calcaris; 4. D. quinqueramus; 5. D. hamatus; 6. D. brouweri; 7. D. surculus; 8. D. bellus; 9. D. variabilis; 10. D. berggrenii