Multivariate techniques for biostratigraphical correlation

Kovach, Warren L.

doi:10.1144/gsjgs.150.4.0697

Cited by 73 publications

(71 citation statements)

References 18 publications

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“…A Q-mode cluster analysis dendrogram classification was produced using the Bray-Curtis similarity coefficient. Detrended canonical correspondence analysis (DCCA; Kovach, 1993) was used to summarize the benthic foraminiferal faunal distribution and assist in its interpretation with respect to tidal elevation and salinity. Ordinations of the samples and species were plotted on the first two detrended correspondence analysis axes.…”

Section: Statistical Analysesmentioning

confidence: 99%

Ecological Distribution of the Foraminifera in a Tidal Lagoon-Brackish Lake, New Zealand, and Its Holocene Origins

Hayward¹,

Grenfell²,

Sabaa³

et al. 2011

The Journal of Foraminiferal Research

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The shallow subtidal to intertidal sandy mudflats of an unusual, 6 km 2 , alternating tidal lagoon-brackish lake (Lake Onoke, New Zealand) has a remarkably consistent foraminiferal fauna dominated (.80%) by Miliammina fusca. During intervals when the gravel barrier across its mouth is closed, the salinity in the lake declines and the level may rise to 1 m above the extreme astronomical tide level (EHWS) of the sea outside. A transect of samples through and above the salt marsh on the edge of Lake Onoke identifies three elevation-related foraminiferal zones: M. fusca (up to mid tide level, MSL); M. fusca-Trochamminita salsa (MSL to mean high water level, MHW); and T. salsa-Haplophragmoides wilberti (MHW to 1 m above EHWS). This is the first record of foraminiferal faunas living above EHWS in New Zealand.Foraminiferal faunas in Holocene sediment cores indicate that a much larger, ancestral Lake Onoke (,20 km 2 ) was created 400023000 cal yr BP, presumably by the growth of a gravel barrier across the previously open mouth to the sea. During the late Holocene, river sand prograded southwards into ancestral Lake Onoke creating swampy alluvial flats that separate modern Lake Onoke from its freshwater counterpart, Lake Wairarapa.Foraminiferal faunas indicate the early Holocene (6500-4000 cal yr BP) presence of an elongate (30 km-long), mostly intertidal embayment extending up the lower Wairarapa Valley beneath present-day Lakes Onoke and Wairarapa. Foraminifera-based elevation estimates suggest that during the early Holocene, this embayment subsided at a rate of about 1-2 mm per yr, sufficient to accommodate the accumulating mud and retain an extensive area (.20 km 2 ) of tidal flats. A slowing rate of subsidence accompanied by eustatic sea-level fall probably account for late Holocene aggradation.

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Section: Statistical Analysesmentioning

confidence: 99%

Ecological Distribution of the Foraminifera in a Tidal Lagoon-Brackish Lake, New Zealand, and Its Holocene Origins

Hayward¹,

Grenfell²,

Sabaa³

et al. 2011

The Journal of Foraminiferal Research

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“…To help alleviate the 'worst' situation, reliable core correlation can often be achieved using sequence-slotting procedures (Birks and Gordon 1985;Thompson and Clark 1989) or other numerical procedures (Kovach 1993) with percent loss-on-ignition [percentage weight loss after burning at 550 or 900…”

Section: Introductionmentioning

confidence: 99%

Multi-proxy studies in palaeolimnology

Birks

2006

Veget Hist Archaeobot

312

173

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Multi-proxy studies are becoming increasingly common in palaeolimnology. Eight basic requirements and challenges for a multi-proxy study are outlined in this essay -definition of research questions, leadership, site selection and coring, data storage, chronology, presentation of results, numerical tools and data interpretation. The nature of proxy data is discussed in terms of physical proxies and biotic proxies. Loss-on-ignition changes and the use of transfer functions are reviewed as examples of problems in the interpretation of data from multi-proxy studies. The importance of pollen analysis and plant macrofossil analysis in multi-proxy studies is emphasised as lake history cannot be interpreted without knowledge of catchment history. Future directions are outlined about how multi-proxy studies can contribute to understanding biotic responses to environmental change.

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“…This small software guarantees mathematical correctness and is frequently updated; further free multivariate analysis software MVSP (by Kovach Computing Services, Anglesey, U.K.) [11], DataLab, for small data sets (by Lohninger Software, Austria), and Past data analysis [12] were used. Graphs, calculation, data collection was performed by Lotus 123 spreadsheet [13]; unfortunately the company, IBM, has recently released no significant upgrade.…”

Section: Methodsmentioning

confidence: 99%

Razors, Horse Bits or Axes; Search of the Different Composition in Common Use Bronze Villanovan Objects (VIII-VII Century B.C., Italy) by Multivariate Analysis

Visco

Ridolfi²,

Plattner³

et al. 2010

CAC

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One of the main issues still not resolved is to what extent casters were capable to change the composition of the bronze objects in order to meet the demands of the "market". To face this problem it is necessary to study a large number of items produced by a single foundry with modern analytical techniques.The discovery of a Dolium at the end of 1800, buried near a furnace containing more than 14,000 pieces of bronze objects allowed performing compositional analysis on virtually every item of daily use. The objects were found in central Italy near Bologna in the so called "ripostiglio di San Francesco" ("hoard of San Francesco"). 431 measurements were carried out using portable energy dispersive x-ray fluorescence analysis (EDXRF). Abundance of the main elements (Cu, Sn, Pb, Fe, Sb, Ag, As) in the bronze alloy was analysed on 229 objects, after their brushing in order to remove the "patina" of oxidation. On 126 objects a single point was analysed (with measurement repetition), while on 155 objects two or more points were investigated. The research objects were chosen among the 14,000 pieces by museum curators and were grouped in 15 categories based on a visual and functional study. The complete data set was studied by chemometric analyses with Explorative Data Analysis techniques.The results of this preliminary study could not identify a clear correlation between composition and destination of use. However, some of the technical aspects of the fusion process were highlighted by this research.

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Multivariate techniques for biostratigraphical correlation

Cited by 73 publications

References 18 publications

Ecological Distribution of the Foraminifera in a Tidal Lagoon-Brackish Lake, New Zealand, and Its Holocene Origins

Ecological Distribution of the Foraminifera in a Tidal Lagoon-Brackish Lake, New Zealand, and Its Holocene Origins

Multi-proxy studies in palaeolimnology

Razors, Horse Bits or Axes; Search of the Different Composition in Common Use Bronze Villanovan Objects (VIII-VII Century B.C., Italy) by Multivariate Analysis

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