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Discoaster

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Journal Article
Published: 01 January 1989
Journal of Paleontology (1989) 63 (1): 10-14.
Journal Article
Published: 01 March 1985
Journal of Paleontology (1985) 59 (2): 309.
Journal Article
Published: 07 December 2016
Journal of Micropalaeontology (2016) 36 (2): 137-152.
...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...
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Journal Article
Published: 01 January 1971
Micropaleontology (1971) 17 (1): 43-52.
Journal Article
Journal: AAPG Bulletin
Published: 01 January 1965
AAPG Bulletin (1965) 49 (1): 98-99.
..., and Wollin (1963 ) recently defined the Pliocene-Pleistocene boundary in deep-sea cores from the Atlantic and Indian Oceans on paleontological evidence, namely the extinction and evolutionary changes of discoasters and certain foraminifers. Their article prompted subsequent discussions of this “faunal break...
FIGURES
Journal Article
Published: 01 January 2007
Micropaleontology (2007) 53 (1-2): 127-144.
... to top as follows: Markalius inversus (NP1), Cruciplacolithus tenuis (NP2), Chiasmolithus danicus (NP3), Ellipsolithus macellus (NP4), Fasciculithus tympaniformis (NP5), Heliolithus kleinpellii (NP6), Discoaster mohleri (NP7/8) and Discoaster multiradiatus (NP9) zones. The Danian/Selandian boundary...
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Journal Article
Journal: AAPG Bulletin
Published: 01 October 1967
AAPG Bulletin (1967) 51 (10): 2164-2165.
.... Discoasters, which due to their large size are very easy to observe and use stratigraphically, first appeared in the middle Paleocene. Late Paleocene, early and middle Eocene pelagic sediments contain a remarkable succession of rapidly evolving calcareous nannoplankton assemblages, culminating in a diversity...
Journal Article
Published: 01 July 2013
Journal of Micropalaeontology (2013) 32 (2): 197-205.
... of Catinaster coalitus and Catinaster calyculus in the early Late Miocene, we document Catinaster mexicanus in both the mid-late Miocene and the Early Pliocene. We confirm its taxonomic validity, rejecting previous interpretations of Pliocene C. mexicanus specimens as the result of dissolution of Discoaster...
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Journal Article
Published: 01 July 2012
Journal of Micropalaeontology (2012) 31 (2): 169-178.
...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...
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Journal Article
Journal: AAPG Bulletin
Published: 01 March 1983
AAPG Bulletin (1983) 67 (3): 415.
...M.-P. Aubry ABSTRACT The extinction of Discoaster barbadiensis and D. saipanesis , the last representatives of the highly successful low- and mid-latitude group of Paleogene rosette-shaped discoasters, close to the Eocene-Oligocene boundary, has been unfortunately seen by some as evidence...
... foraminifers ( Globigerinoides obliquus , G. extremus , and Globigerina nepenthes ), and calcareous nannoplankton ( Discoaster brouweri , Discoaster aff. Discoaster surculus , Sphenolithus abies , and S. neoabies ), whereas microfossils in the final phase contain a less diverse assemblage of benthic...
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Journal Article
Journal: Geology
Published: 01 August 2003
Geology (2003) 31 (8): 697-700.
...Jean M. Self-Trail Abstract Fractured calcareous nannofossils of the genus Discoaster from synimpact sediments within the Chesapeake Bay impact crater demonstrate that other petrographic shock indicators exist for the cratering process in addition to quartz minerals. Evidence for shock-induced...
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Journal Article
Journal: AAPG Bulletin
Published: 01 April 1984
AAPG Bulletin (1984) 68 (4): 480.
... in relative sea level rather than by progradation. Discoaster diastypus, Tribrachiatus bramlettei , or Tribrachiatus contortus occur in the lower 3 cycles. First occurrence of these 3 species has been used to define the base of calcareous nannofossil Zone NP10 of Martini or the Discoaster diastypus Zone...
Journal Article
Journal: AAPG Bulletin
Published: 01 October 1974
AAPG Bulletin (1974) 58 (10): 2214-2215.
.... Placoliths generally are well preserved, but the centers of many specimens are obscured by pelatoid overgrowths. Many specimens also bear sparry extensions of isolated shield elements. The presence of Discoaster gemmeus , and the absence of recognizable specimens of Discoaster nobilis and Heliolithus riedeli...
Journal Article
Journal: GSA Bulletin
Published: 01 June 1973
GSA Bulletin (1973) 84 (6): 2021-2034.
... of the Olduvai event within the Matuyama reversed epoch, is closely approximated by the extinction of the last true discoaster species at about 1.8 m.y. B.P. Within the Pliocene, six datum levels are recognized, and correlation with Mediterranean Pliocene deposits indicates an age of about 5 m.y. for the Miocene...
Journal Article
Published: 01 July 1963
Journal of Paleontology (1963) 37 (4): 845-856.
...E. Martini; M. N. Bramlette Abstract The calcareous nannoplankton of cores from the experimental Mohole drilling indicate that Pliocene and Miocene strata were penetrated, with middle Miocene overlying the basalt in which drilling ended. Coccoliths and discoasters are the common forms, although few...
Image
1 ,  <b>Discoaster</b> deflandrei  (sample U1338C-46H-2, 45 – 46 cm).  2 , Intergr...
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
Sequence of  <b>Discoaster</b>  evolutionary events across the early&#x2F;middle Miocen...
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
1 ,  <b>Discoaster</b> brouweri  (sample U1338A-13H-3, 120 – 121 cm).  2 ,  Discoa...
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
Image
Total abundance of  <b>Discoaster</b>  spp. ( n  mm −2 ) plotted v. age. The Mid M...
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.