VI. Geophysical interpretation of palaeomagnetic directions from Great Britain

Creer, K. M.; Irving, E.; Runcorn, S. K.

doi:10.1098/rsta.1957.0017

Cited by 97 publications

(15 citation statements)

References 9 publications

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“…Comparison of such polar wandering paths for separated continental blocks provided initial important confirmation of continental drift (Creer, Irving & Runcorn 1957). Polar wander paths may also be significant from a different viewpoint: the possibility has been proposed by Irving & Robertson (1969) that periods of rapid movement of the pole may be related to periods of increased tectonic activity, or diastrophic intervals.…”

Section: Introductionmentioning

confidence: 89%

Palaeomagnetism of the Canary Islands and Madeira

Watkins

1973

Geophysical Journal International

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SurnmaryPalaeomagnetic results are presented for 1144 specimens from a total of 359 igneous bodies from the Canary Islands and Madeira. Available stratigraphic control, together with 90 K:Ar age determinations enable the data to be reliably assigned to the Pleistocene (t = 0-1.6 My); Pliocene (t = 1-6-5.1 My); and Miocene (t = 5.2-25 My) periods. The mean virtual geomagnetic pole positions for each of these periods are indistinguishable and are significantly different from the present geographic pole in a sense consistent with Wilson's offset dipole hypothesis. If considered as part of a polar wander path for the Tertiary era, the results suggest that if any marked change of polar wander rate occurred during the Mid-Tertiary, a slowing (rather than an increase) in the rate is likely to have occurred. * Received in original form 1972 November 6. 249 1 N. D. Watkinspreviously published stratigraphic maps, facilitates reliable assignment of all data to the Pleistocene, Pliocene, or Miocene periods. These palaeomagnetic data will thus provide a unique opportunity to monitor the polar wandering rate for the past 25 My, relative to a restricted part of the Earth's crust. At the same time, the results are relevent to those hypotheses involving long-term distortion of the geomagnetic field away from that of a centred axial dipole (Wilson

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Section: Introductionmentioning

confidence: 89%

Palaeomagnetism of the Canary Islands and Madeira

Watkins

1973

Geophysical Journal International

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“…It appears that New York State, New England and South Eastern Canada, and the Old Red areas of Britain and N.W. Europe, must have been essentially tropical in Old Red times (see, e.g., Creer, Irving and Runcorn, 1957). To this extent we agree with Inger.…”

Section: Placoderms and Acanthodians In Numbers Also Lived In The Frementioning

confidence: 52%

IV.—The Origin of Continental Vertebrate Faunas

Westoll¹

1958

TRNGL

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upon-Tyne, The Univer sity of Durham.It is now well-established that the land surfaces of the world have not always carried an extensive vegetation or a substantial animal population, and there are innumerable papers in the scientific literature of Geology, Zoology and Botany that have dealt with various aspects of the evolution of present conditions. It is very understandable that man should be particularly con cerned with the problems of his own ancestry, and we can now be reasonably sure of the main outlines of the history of truly terrestrial vertebrates from at least early Permian times onwards. The mammal-like reptiles (the Pelycosauria) of the early Permian differentiated into several stocks, from one of which arose the diversified Therapsida of the later Permian and Triassic periods. These include quite certainly the ancestral group or groups from which mammals evolved, probably in late Triassic times. Mammal remains of Mesozoic age are very scarce, and a dispassionate survey of the geological evidence indicates that this is probably due very largely to the geological accident that extensive sequences of essentially continental and fossiliferous deposits like those of the Lower Permian of north-central Texas (Romer, 1958) or the Karroo of South Africa are not known in the Jurassic and Cretaceous of the well-explored parts of the world. But through these "Dark Ages" of mammalian history scattered and fragmentary remains do provide a patchy record, however inadequate they may be to permit a detailed story to be de ciphered. The main theme of mammalian, and especially eutherian, expansive evolution is much more abundantly docu mented from Palaeocene times onwards.During the whole of this last 200 million years or so of earth history one is in no doubt of the existence of a substantial fauna and flora on the continents, though these land-masses of course have undergone many changes in extent and outline, and probably also in relative position. The Reptilia (Fig. IV, 5), and even some of the Amphibia, of early Permian age show the on July 3, 2015 at West Virginia University http://trngl.lyellcollection.org/ Downloaded from

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“…In fine grained, banded sandstones the orientation of the grains appears to have been much more effectively achieved than in unhanded and in coarser sediment, and study of contemporaneously slumped beds suggests that rotation of grains under the influence of the earth's field may continue as long as the sediment remains waterlogged. Measurement of the permanent magnetization of specimens from the Diabaig, Applecross and Aultbea groups shows (Irving and Runcorn, 1957) [Trans.…”

Section: Torridonianmentioning

confidence: 99%

III.—Summary of Recent Research on the Pre-Tertiary Geology of the Northern Highlands

Phemister¹

1958

TRNGL

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VI. Geophysical interpretation of palaeomagnetic directions from Great Britain

Cited by 97 publications

References 9 publications

Palaeomagnetism of the Canary Islands and Madeira

Palaeomagnetism of the Canary Islands and Madeira

IV.—The Origin of Continental Vertebrate Faunas

III.—Summary of Recent Research on the Pre-Tertiary Geology of the Northern Highlands

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