James M. Thomas

Ashford and St Peter's Hospitals NHS Foundation Trust

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PROLECANITINA FROM THE CARBONIFEROUS ROCKS OF NORTH DEVON

Proceedings of the Yorkshire Geological Society (1965)

J. E. Prentice James M. Thomas

Summary Protocanites cf. lyoni (Meek and Worthen) from below the Codden Hill Chert confirms a Iα (Tournaisian) horizon. A Merocanites from the Codden Hill Chert and Bampton Limestones is compared with M. similis Crick, whose specific identity is maintained; these indicate zone II (that is, below B 2 ) horizon. Prolecanites hesteri and Pronorites cyclolobus in the Bampton and Westleigh limestones indicate a IIIα (B 2 —P 1a ) and IIIα—IIIβ (that is, P 1a —P 1d ) age respectively.

10.1144/pygs.35.1.33

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Citations (6)

Upper Palaeozoic sediments and structure in north Cornwall—a reinterpretation

Proceedings of the Geologists Association (1985)

E. B. Selwood Ian Stewart James M. Thomas

SLATES

Devonian

Flysch

Reinterpretation

Cliff

10.1016/s0016-7878(85)80063-8

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Citations (23)

Whitsun field meeting: Devonian of West Somerset and Carboniferous of North-East Devon

Proceedings of the Geologists Association (1965)

B. D. Webby James M. Thomas

Devonian

North east

10.1016/s0016-7878(65)80005-0

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Citations (5)

Use of YB₆₆ as monochromator crystals for soft-energy EXAFS

Journal of Synchrotron Radiation (1998)

Andrew D. Smith Bruce C. C. Cowie Gopinathan Sankar James M. Thomas

YB(66)(400) crystals present a new advance in monochromator crystals suitable for use at energies below 2 keV. In this paper a comparison of their performance with that provided by the more usual beryl and quartz crystals, which cover the same energy range, is presented. In general, the YB(66) crystals are much superior; however, they do exhibit a pair of large 'crystal glitch'-type features in the 1380-1440 eV region. These fall in the Mg K-EXAFS region and so can present a serious problem in studies of this edge for a wide range of materials. An important class of materials so afflicted are magnesium-substituted aluminophosphate molecular sieves (zeolites), which are used in many applications, in particular as solid acid catalysts for conversion of methanol to hydrocarbon.

Monochromator

Crystal (programming language)

10.1107/s0909049597019523

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Citations (5)

Oxidation of Gaseous Formaldehyde

Nature (1966)

Ronald George Wreyford Norrish James M. Thomas

Reaction rate

10.1038/210728a0

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Citations (3)

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Citations (0)

Variscan facies and structure in central SW England

Journal of the Geological Society (1986)

E. B. Selwood James M. Thomas

The character and distribution of middle Devonian to upper Carboniferous facies in central SW England is described. These may be interpreted in terms of the simple model of a shelf extending from a continent to the north, across most of SW England in earliest Devonian times. Within it a major E–W trending basin developed during the middle Devonian, possibly as a half graben structure with an active northern hinge. On this shelf in mid and late Devonian times, argillite successions accumulated to the north and a carbonate complex on the now starved platform to the south of the basin. In the early Carboniferous, basinal conditions extended northwards over the shelf, but to the south, at first flysch and then paralic sediments with a southern origin were ponded against the carbonate complex. Flysch penetrated through and across the platform into the intra-shelf basin. This flysch prograded northward to cover the whole area by early late Carboniferous times. The western part of the main basin suffered structural inversion in late Visean times and semiconsolidated sediments spread northward across its margin. The eastern extension of the basin was not deformed until the late Namurian, at which time successions were folded and disrupted into nappe structures showing northward transport. The most far-travelled nappes are represented at the highest structural levels. The stratigraphy of the coastal section of N Cornwall, which has been used to devise a structural model involving a major autochthonous south-facing overfold, is reassessed. The nappe structures and successions recognized inland are identified on the coast, and the overfold model is disproved. The whole of central SW England forms part of southerly derived thrust and nappe terrane.

10.1144/gsjgs.143.1.0199

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Citations (21)

Oxidation of Carbon-14-Labeled Endogenous Lipids by Isolated Perfused Rat Heart

Science (1964)

Joseph C. Shipp James M. Thomas Lamar Crevasse

Lipids of the rat heart were labeled with carbon-14 in vivo. The production of C(14)O(2) during the subsequent perfusion of these glycogen-depleted hearts with buffer, but without added substrate, provided direct evidence of the oxidation of endogenous heart lipids. The net decrease in phospholipid content alone could account for 75 percent of the total metabolic CO(2) formed.

10.1126/science.143.3604.371

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Citations (43)

A revision of the Upper Palaeozoic stratigraphy of the Trevone Basin, north Cornwall, and its regional significance

Proceedings of the Geologists Association (1993)

E. B. Selwood James M. Thomas G. D. Borley Andrew Dean

Syncline

Devonian

Lithostratigraphy

10.1016/s0016-7878(08)80015-6

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Citations (3)

Upper Palaeozoic successions and nappe structures in north Cornwall

Journal of the Geological Society (1986)

E. B. Selwood James M. Thomas

For many years the geology of north Cornwall has been interpreted in terms of a south-facing overfold model, which predicts a major confrontation at Padstow with the north-facing structures of south Cornwall. New evidence indicates the existence of contrasting successions separated by flat-lying thrusts. In upward succession the Port Isaac, Tredorn and Boscastle nappes are identified; the first appears to have been emplaced by gravity sliding in late Viséan times, followed by the Tredorn and Boscastle nappes in the early Namurïan. Strata represented in the inverted limb of the Port Isaac Nappe, not previously distinguished, are described as the Jacket's Point Slate Formation. Throughout the nappe pile there is consistent evidence of north-facing and northward transport for distances measured in tens of kilometres. Not more than 3 km of south-facing strata may now exist at the Padstow confrontation, and this feature is unlikely to be of great regional significance. The allochthon extends northwards to the Rusey Fault Zone where the autochthon was locally backfolded over the allochthon in late Westphalian times; this appears to be the only significant confrontation of facing directions in north Cornwall.

Lithostratigraphy

10.1144/gsjgs.143.1.0075

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Citations (23)