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The Cretaceous Limestones of Jamaica and their Mollusca
Geological Magazine - Tập 61 Số 9 - Trang 385-410 - 1924
C. T. Trechmann
Most of the exposures of Cretaceous Limestone in Jamaica were faithfully indicated on the Geological Survey map of Sawkins and Brown in 1865. They are limited in extent and occur at certain places among the complex of the older or Blue Mountain series of rocks that project from beneath the covering of White Limestone that covers the greater part of the Island. Contrary to one's common experience i... hiện toàn bộ
The Barrettia Beds of Jamaica
Geological Magazine - Tập 59 Số 11 - Trang 501-514 - 1922
C. T. Trechmann
Barrettia, the most abnormal of the Rudistæ, and among the strangest of all the mollusca, was first found in Jamaica by Lucas Barrett, F.G.S., in the year 1861. The specimens were ably described by S. P. Woodward, F.G.S., in 1862. The original specimens, now in the British Museum of Natural History, consist of polished transverse and longitudinal sections of the upper part of the shell, the latter... hiện toàn bộ
I.—A Note on the Geology of Somali-land, based on Collections made by Mrs. E. Lort-Phillips, Miss Edith Cole, and Mr. G. P. V. Aylmer
Geological Magazine - Tập 3 Số 7 - Trang 289-294 - 1896
J. W. Greǵory
Since the famous expedition of the late F. L. and W. James, of E. Lort - Phillips and G. P. V. Aylmer, in 1884–5, opened the Somali plateau to European exploration, the country has been repeatedly traversed. A valuable series of geographical memoirs, hunting journals, and bluebooks has described the main features in the topography of the country, and given many suggestions as to its geological str... hiện toàn bộ
Factors controlling the kinetics of crystallization: supersaturation evolution in a porous medium. Application to barite crystallization
Geological Magazine - Tập 127 Số 6 - Trang 485-495 - 1990
Manuel Prieto Rubio, Andrew Putnis, Lurdes Fernández-Dı́az
AbstractThe nucleation of barite has been studied in a system involving the doublediffusion of Ba2+and SO42-in an Na-rich aqueoussolution, through a porous medium. The evolution of the concentration profiles in the medium, which is a column of porous silica gel, has been determined as a function of time by direct chemical analysis of the diffusion-controlled mass transfer. By measuring the pH evol... hiện toàn bộ
Fluid supersaturation and crystallization in porous media
Geological Magazine - Tập 132 Số 1 - Trang 1-13 - 1995
Andrew Putnis, Manuel Prieto Rubio, Lurdes Fernández-Dı́az
AbstractThe relationship between the supersaturation at the point of crystallization and the rate at which supersaturation increases has been studied from nucleation experiments on barite BaSO4, strontianite SrCO3, witherite BaCO3 and gypsum CaSO4.2H2O. The crystallization experiments have been carried out by the counter-diifusion of cations and anions through a column of porous silica gel transpo... hiện toàn bộ
A basement culmination in the Scandinavian Caledonides formed by antiformal stacking (Bångonåive, northern Sweden)
Geological Magazine - Tập 130 Số 4 - Trang 471-482 - 1993
Reinhard O. Greiling, R. A. Gayer, Michael B. Stephens
AbstractThe Bångonåive basement culmination, a doubly plunging antiform trending SW-NE in its southern part and SSW-NNE in the north, is part of a major Caledonian antiform in north-central Scandinavia. Crystalline, Proterozoic basement rocks (mainly syenite) are unconformably overlain by a sedimentary cover including tillites at the base, passing up into arkoses, quartzites and shales, capped by ... hiện toàn bộ
Classification of fault breccias and related fault rocks
Geological Magazine - Tập 145 Số 3 - Trang 435-440 - 2008
Nigel Woodcock, Kate Mort
AbstractDespite extensive research on fault rocks, and on their commercial importance, there is no non-genetic classification of fault breccias that can easily be applied in the field. The present criterion for recognizing fault breccia as having no ‘primary cohesion’ is often difficult to assess. Instead we propose that fault breccia should be defined, as with sedimentary breccia, primarily by gr... hiện toàn bộ
Some Underwater Disturbances in the Torridonian of Skye and Raasay
Geological Magazine - Tập 100 Số 3 - Trang 224-243 - 1963
Richard C. Selley, D. J. Shearman, John Sutton, Janet Watson
AbstractThe paper deals with disturbances of bedding contemporaneous with deposition in Torridonian rocks of Skye and Raasay. Most of the structures described have the general form of sharp upwardly-directed peaks separated by areas of more or less undisturbed bedding; within the peaks the bedding is often contorted or destroyed. The structures are developed in sandstones and are thought to have b... hiện toàn bộ
On Certain Slump Structures in the Torridonian Sandstones of Applecross
Geological Magazine - Tập 100 Số 3 - Trang 205-218 - 1963
A. D. Stewart
AbstractTwo types of slumps are described; small sag and drop-shaped structures in the fine sandstones which develop out of iron-ore rich laminae, and the much larger slump folds in the coarse sandstones which have wavelengths of 25 to 200 cm. and are characterized by open “synclines” linked by pointed “anticlines”. Complex structures are common. It is suggested that liquifaction of the lower part... hiện toàn bộ
Geology, geochronology and chemical evolution of the island of Pantelleria
Geological Magazine - Tập 121 Số 6 - Trang 541-562 - 1984
L. Civetta, Y. Cornette, Gino Mirocle Crisci, A. Hildenbrand, G. Orsi, C. S. Requejo
AbstractPotassium–argon dating, field relations, geochemical and strontium-isotope compositions are reported for the island of Pantelleria (Strait of Sicily, Italy). These data support the following model for the genesis and evolution through time of the volcanic system: the peralkaline rocks originated from mantle-derived parental magmas; the trachytic magma differentiated in a low pressure magma... hiện toàn bộ
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