ISSN:
1573-5117
Keywords:
Holocene
;
palaeolimnology
;
diatom
;
lipid
;
palaeomagnetism
;
varves
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Studies of frozen and soft mud cores from Ellesmere Mere, Rostherne Mere and Berrington Pool, the three deepest of the Shropshire-Cheshire meres of the English Midlands, reveal the presence of laminations which may be varves. This hypothesis is being tested by means of fine resolution diatom and other microfossil analysis after the method of Simola (1977). Even where the laminations are faint and disrupted, it appears that seasonal signals from algal blooms are preserved. Organic geochemical analyses of sediments from Ellesmere show that the uppermost layers contain abundant organic matter (over 17% total dry matter) and that the extractable lipid fractions from different horizons exhibit clear compositional differences. These are produced by temporal changes in the organic inputs to the sediments, and also by diagnetic effects. The clastic and organic content of the cores also provides evidence for lake level variations in this area over the last 250 years.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00050962
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