Towards a Quaternary Time Scale

Berggren, William A.; Burckle, Lloyd H.; Cita, Maria Bianca; Cooke, H. B. S.; Funnell, B. M.; Gartner, Stefan; Hays, James D.; Kennett, James P.; Opdyke, Neil D.; Pastouret, Léo; Shackleton, N. J.; Takayanagi, Yuki

doi:10.1016/0033-5894(80)90058-7

Cited by 116 publications

(44 citation statements)

References 35 publications

(37 reference statements)

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“…Climates of the world have been characterized by a series of glacial-interglacial cycles for at least 2·5 million years (Berggren et al, 1980), and most probably well before this (Aplin et al, 1993). A glacial peak c. 125 000 years BP is thought to have reduced northern Australian sea levels to at least 150 m below present levels (Chappell, 1983;Shackleton, 1987), thus forming a land bridge between Australia and New Guinea (Fig.…”

Section: Recent History and Zoogeography Of Western Australian Barrammentioning

confidence: 99%

Mitochondrial genealogy of Western Australian barramundi: applications of inbreeding coefficients and coalescent analysis for separating temporal population processes

DOUPE¹

1999

Journal of Fish Biology

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In Australian populations of barramundi Lates calcarifer, phylogenetic reconstruction of mtDNA sequences provided evidence of significant historical levels of gene flow, despite the substantial structuring of contemporary populations. The geographical pattern of mtDNA sequences among the populations was not congruent with previous evidence of a major disjunction between western and eastern populations of barramundi in Australia.

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Section: Recent History and Zoogeography Of Western Australian Barrammentioning

confidence: 99%

Mitochondrial genealogy of Western Australian barramundi: applications of inbreeding coefficients and coalescent analysis for separating temporal population processes

DOUPE¹

1999

Journal of Fish Biology

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“…Figure 2 shows these zones and the species events used to define them. The base of the Quaternary was placed at the (Berggren et al, 1980). The Quaternary was divided into two zones, one of which had three subzones.…”

Section: Biostratigraphic Zonationmentioning

confidence: 99%

Quaternary and Pliocene Planktonic Foraminifers of the Northeastern Atlantic (Goban Spur), Deep Sea Drilling Project Leg 80

Pujol¹,

Duprat²

1985

Initial Reports of the Deep Sea Drilling Project

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Quaternary to Pliocene planktonic foraminifers of the Goban Spur, off the Irish coast, were investigated for their biostratigraphic and environmental significance.Three biostratigraphic zones were recognized in the Pliocene. The uppermost of these (the Globorotalia inflata Zone) includes the transition between the Pliocene and the Quaternary. The Quaternary (the G. truncatulinoides Zone) is subdivided into three subzones; from the base, the G. truncatulinoides, G. hirsuta, and Turborotalita humilis subzones. The thorough study of ecological assemblages of planktonic foraminifers led to the division of the PlioceneQuaternary sequence into some 30 bioclimatic subdivisions. Some of them are correlated with isotopic stages.The Pliocene/Quaternary boundary does not appear to be well marked in the foraminiferal assemblages. The first indication of cooling appears at the base of the Olduvai Event. The first appearance datum (FAD) of G. truncatulinoides, which is usually used as a marker of the Quaternary base, occurs at the Jaramillo Event.A significant biological event, the first appearance of G. hirsuta, is dated as occurring approximately 470,000 yr. ago and marks an environmental change. It occurs during bioclimatic Subdivision XIII.The surficial Quaternary paleoenvironments in the North Atlantic were studied. The hydrological environment is illustrated by estimates of summer and winter surface water temperatures. During glacial periods, water temperatures are assumed to have averaged approximately 5.8°C in summer and 0°C in winter. All year long, there is a difference of about 10°C between the present and glacial periods that is also characteristic of the changes in geographic regions that are subject to intermittent glaciation. The general pattern of temperature estimates shows that a slight general cooling has taken place from 470,000 yr. ago to the present.Twenty-four species of planktonic foraminifers were identified. Some of the most abundant of these are illustrated.

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“…The upper Cenozoic zones represented and their estimated time relations are given in Table 2. Estimated ages of the calcareous nannofossil datum levels are those proposed by Berggren et al (1980), Haq and Berggren (1978), Gartner (1977), Thierstein et al (1977) and Bukry (1975). Tables 3-12 contain the species distribution for each site studied.…”

Section: Introductionmentioning

confidence: 78%

Calcareous Nannofossil Biostratigraphy, Leg 64

Aubry¹

1982

Initial Reports of the Deep Sea Drilling Project

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To investigate the sedimentology ai\d the spreading history of the Gulf of California, holes were drilled in two different areas of the Gulf (Fig. 1). In most holes, calcareous nannofossils could be used to establish stratigraphy.To date the oldest sediments on continental and oceanic crusts, three sites were drilled off the tip of southern Baja California on an east-west transect from young oceanic crust (Site 474) to continental crust (Sites 475 and 476). A thick Pleistocene and upper Pliocene nannofossil-rich sedimentary sequence overlying basalt flows and sills was penetrated at Site 474. Pleistocene and Pliocene hemipelagic muds were recovered at Sites 475 and 476. At these sites, calcareous nannofossils indicate an earliest Pliocene age (between 5 and 4.6 Ma) for the oldest fossiliferous sediments found above the continental crust and reveal a major hiatus, corresponding to most of late Pliocene time.Five sites were drilled in the Guaymas Basin to investigate the sedimentology, paleoceanography, and biostratigraphy of an active spreading basin and the formation of oceanic crust. Sites 477 and 478 were located in the south rift and Site 481 in the north rift. Over 300 meters of upper Pleistocene diatom oozes and turbidites with abundant and well-preserved coccoliths were recovered at Sites 478 and 481. At Site 477, most of the sedimentary sequence had been hydrothermally altered and only 50 meters of upper Pleistocene sediments were fossiliferous.Sites 479 and 480 were drilled on the Guaymas Basin slope, an oxygen-minimum zone. Calcareous nannofossils were rare and poorly preserved in the hemipelagic, muddy, diatomaceous oozes penetrated at both sites. Because of sampling restrictions, Site 480 could not be studied.

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Towards a Quaternary Time Scale

Cited by 116 publications

References 35 publications

Mitochondrial genealogy of Western Australian barramundi: applications of inbreeding coefficients and coalescent analysis for separating temporal population processes

Mitochondrial genealogy of Western Australian barramundi: applications of inbreeding coefficients and coalescent analysis for separating temporal population processes

Quaternary and Pliocene Planktonic Foraminifers of the Northeastern Atlantic (Goban Spur), Deep Sea Drilling Project Leg 80

Calcareous Nannofossil Biostratigraphy, Leg 64

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