The Lower New Red Sandstone of the Crediton Valley

Hutchins, Philip F.

doi:10.1017/s0016756800055333

Cited by 13 publications

(3 citation statements)

References 21 publications

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“…lb) has been described by Hutchins (1963) and Edmonds et al (1968). Small, possibly related, outliers farther west have been described by McKeown et al (1973) and Williams (1976).…”

Section: A3 Successions In Adjacent Areasmentioning

confidence: 79%

The Exeter Group, south Devon, England: a contribution to the early post-Variscan stratigraphy of northwest Europe

et al. 1997

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The lower part of the post-Variscan succession around Exeter, south Devon, England, comprises some 800 m of breccias, with subordinate sandstones and mudstones, which rest upon Devonian and Carboniferous rocks folded during the Variscan Orogeny and are overlain, disconformably, by the Aylesbeare Mudstone Group (Early Triassic?). These deposits comprise the most westerly of the early post-Variscan successions preserved onshore in northwest Europe and lie to the south of the Variscan Deformation Front; they are assigned to the Exeter Group (new term). Geochronological and palaeontological studies, in conjunction with detailed geological mapping, show that the constituent formations comprise a lower (Late Carboniferous(?)-Early Permian) sequence separated from an upper (Late Permian) sequence by an unconformity which represents an hiatus with a duration of at least 20 m.y. The lower sequence contains volcanic rocks dated at between 291 and 282 Ma (Early Permian) and pre-dates intrusion of the nearby Dartmoor Granite (280 Ma). In the overlying, palynologically-dated, Late Permian sequence, older breccias contain clasts of the Dartmoor Granite aureole rocks, and younger ones contain clasts of that granite. The lower sequence occurs mainly within the Crediton Trough, an east-west trending, partly fault-bounded, sedimentary basin that probably formed by extensional reactivation of a Variscan thrust. Breccias in this sequence formed largely on alluvial fans; the common occurrence of debris flows and a down-fan passage from gravity flows into fluvially deposited sediments is typical of deposition on semi-arid fans. The upper (Late Permian) sequence is more widespread but includes similar deposits overlain, at the top of the Exeter Group, by aeolian dune and interdune deposits. Correlation within the laterally variable facies associations which comprise these sequences has been achieved using a combination of sedimentary facies analysis, sedimentary geochemistry, and petrographical and geochemical clast typing. The stratigraphy revealed within the Exeter Group is broadly comparable with that recognized in the early post-Variscan Rotliegend successions elsewhere in Europe. This similarity may, however, be deceptive; the upper part of the Exeter Group may be coeval with the Zechstein, and apparently correlatable major unconformities in the group and the Rotliegend may reflect different events in the Variscan fold-belt and Variscan Foreland areas, respectively.

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“…lb) has been described by Hutchins (1963) and Edmonds et al (1968). Small, possibly related, outliers farther west have been described by McKeown et al (1973) and Williams (1976).…”

Section: A3 Successions In Adjacent Areasmentioning

confidence: 79%

The Exeter Group, south Devon, England: a contribution to the early post-Variscan stratigraphy of northwest Europe

et al. 1997

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“…All are of late Cainozoic age, and though the details of interpretation are probably invalidated by the recognition of significant late geological faulting in the massif (Blyth, 1957(Blyth, , 1962Dearman, 1963Dearman, , 1964 considerable erosion clearly occurred during this period. But it has long been recognised that erosion exposed, or nearly exposed, the crystalline pluton by the end of the Mesozoic, possibly by the Lower Cretaceous (see, for example, Smith, 1961;Hutchins, 1963), and the importance of the sub-Cretaceous land surface as a significant element of the present landscape has been increasingly recognised (Simpson, 1964). Thus the erosion to which the advocates of the offloading hypothesis attribute the development of the deep-seated joints is probably that which occurred in the Mesozoic.…”

Section: Arguments Against the Pressure Release Hypothesismentioning

confidence: 99%

Structural Landforms: Landforms Associated with Granitic Rocks, Faults, and Folded Strata

Twidale¹

1972

The Geographical Journal

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The production of any book involves far more than its writing. It entails much tedious and painstaking work, and I wish to take this opportunity to thank those several persons who, directly or in directly, and in numerous ways, have helped with the preparation of Structural Landforms. Many colleagues and friends have kindly supplied photographs, many of which, for reasons of space, have not been utilised. Only one request for illustrative material was directly refused, and, whether the prints supplied were used or not, I wish to thank those who went to so much trouble on my behalf. I am grateful to the many organisations and individuals who kindly gave permission to use photographs and illustrations, and whose assistance is acknow ledged in the text. Janet Saies and Janeen Nicol read the first draft, justifying their interest with the modest claim that if they could understand the text then anyone could. They could not follow all of it, and I am grateful to them for drawing my attention to ambiguous and con fused passages, for their expenditure of time, and their humour and enthusiasm. Tim Hopwood has drawn my attention to certain anachronisms in my use of structural terms, and George Sved has, over the years, done much to disembarrass my mind of some, though I fear not all, mechanically unsound ideas. Yngvar Isaacson and Bruce Curtis have generously made available their expert knowledge of certain North American areas, and I have profited greatly from discussion of particular problems in structural geomor phology with Jim Talbot, Edwin Hills, Rudi Horwitz, Armin Öpik, and Heli Wopfner. The onerous task of translating my rough sketches into line draw ings fell to John Heyward, of the Department of Human Geography, Institute of Advanced Studies, Australian National University. Apart from the field sketches, he is responsible for all the figures, and the skill and flair he has brought to his task are obvious to all. ix X Acknowledgments To John and to his superiors, who so generously and understand ing^ allowed me the use of his services, I am most grateful. My wife, Kate, quite apart from encouraging me to continue with the writing of the book in the face of more than usually difficult and trying circumstances, with her customary skill, patience and instinct, deciphered my scrawl, unravelled my amendments, and from it all produced a typescript. I am the more appreciative of her help because I know how difficult it was for her to fit in the typing between running a household, caring for a family, and sundry other good works. Most of all, however, I must express my gratitude to the General Editor of this series, J. N. Jennings. Joe has for many years now given me much help and good advice, but never so much as in the preparation of this book. For providing the opportunity to par ticipate in the series, for his liaison work between author and draftsman, for his tact, patience, encouragement, and understanding, for his many helpful suggestions, and, most of all, for his scholarly and critical mind, I thank him.

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“…See, e.g.,Ussher (1913), p. 82. Sanidine is 2 Ussher (1913), p. 83. referred to as Murchisonite.3Hutchins (1963).…”

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confidence: 99%

A Contribution to the Study of Glastonbury Ware from South-Western Britain

Peacock¹

1969

Antiq. J.

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SummaryA petrological study of the rock inclusions present in Early Iron Age Glastonbury ware suggests that the raw materials for pottery making were not usually obtained on or near the find-sites, but from specific localities throughout south-western England. Since each of the petrological groups has its own range of typological traits there is reason to believe that the completed pots, rather than the materials, were transported, suggesting the activity of specialist potters working from production centres. The relevance of the new evidence to the origin of the decorative styles and the cultural interpretation of the pottery is briefly discussed.

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The Lower New Red Sandstone of the Crediton Valley

Cited by 13 publications

References 21 publications

The Exeter Group, south Devon, England: a contribution to the early post-Variscan stratigraphy of northwest Europe

The Exeter Group, south Devon, England: a contribution to the early post-Variscan stratigraphy of northwest Europe

Structural Landforms: Landforms Associated with Granitic Rocks, Faults, and Folded Strata

A Contribution to the Study of Glastonbury Ware from South-Western Britain

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