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Report on Progress in Geophysics Palaeomagnetic Directions and Pole Positions, Part II Pole numbers 2/1 to 2/41 and 1/71 (m 1)

1960; Oxford University Press; Volume: 3; Issue: 4 Linguagem: Inglês

10.1111/j.1365-246x.1960.tb01718.x

1365-246X

E. Irving,

Geology and Paleoclimatology Research

This list incorporates the results available to the author up to April 1960. Cases are now arising where old results are being modified. Changes may arise because of the reworking of old primary data or by the incorporation of some new data from later sampling. Such results retain the old number followed by (m I), (m 2)) etc., signifying the first, second such modification, the nature of the change being indicated in footnotes. Where a rock formation which has been previously studied is re-sampled so that the primary data are entireZy new, the result is given a new list number. The symbol given in column 3 refers to the geological age of the rock unit studied and not to the directions of magnetization and pole positions unless evidence (noted in column 9) is described in the original which allow it to be supposed that the directions of magnetization were acquired at the time the rock unit was formed. It is hoped that more evidence of this type will be forthcoming in the future. Results calculated from rock units which do not cover in time the full range of the secular variation will be subject to errors which are not always taken account of in the published errors. At the moment there is no general agreement about the method for estimating errors, so that although the values listed in column 15 are given at the same probability (P = 0.05) they are not always strictly comparable as different schemes for weighting specimens, samples and collecting sites have been used. For details of these readers are referred to the originals. These last remarks are made in order that a not too uncritical use of the list data will be made. The results are compiled without prejudice and are intended only as a list of what has been done in palaeomagnetism and as a guide to the literature. The inclusion of a result in this list does not necesarily mean that the compiler agrees with the methods used. Because of the time required to abstract data, which are often presented in widely differing forms in periodicals in many languages, it will not always be possible to include results in the list immediately following their publication. However, all efforts will be made to ensure that these lists are up to date, and to help in this regard it would be very greatly appreciated if notification of new work, comments and criticisms could be sent directly to the compiler.