Geological Magazine: Volume 68 -

A Comparison of the Methods of Heavy Mineral Separation
C. J. C. Ewing
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01 May 2009, pp. 136-140
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Methods and apparatus used in the isolation of heavy minerals vary considerably with different workers and this lack of uniformity obviously reduces the value of the conclusions in a branch of petrology in which quantitative data are essential. Panning in water and separation in bromoform are probably the two methods most widely adopted; but even with these there is considerable variation in the apparatus, each investigator using his own special panning device or type of separator. Also, whereas some writers employ direct bromoform separations, others treat the sediment by preliminary panning, and still others are content with panning alone. A paper published recently by Dr. F. Smithson showed the effects of panning on a crushed sandstone from the Yorkshire Trias and the results were compared with those of direct bromoform separations. The divergence of results was so great that it seemed worth while to carry out a similar type of investigation on some normal unconsolidated sands in which the heavy residue makes up about 0·2 to 0·3 per cent of the total bulk. The samples used in this case were mostly from the northern outcrop of the Folkestone Sand in the Weald, but some samples of Eocene Sands from the Continent were also examined.

Scandinavian Trinucleidae, with special reference to Norwegian species and varietes. By Leif Störmer. Skrift. Norske Vidensk.-Akad. Oslo. I, Mat.-Nat. Klasse, No. 4, 1930. Pp. 111; pls. xiv; text-figures 47.
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01 May 2009, p. 93
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The Structure Of Asia. Edited by J. W. Gregory. vi + 227 Pp., with 23 plates and 17 figures in the text. London: Methuen and Co. 1929. 10s.
P. L.
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01 May 2009, pp. 40-41
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Statistisch-Biostratigraphische Untersuchungen an Mitteljurassischen Ammoniten über Artbegriff und Stammesentwicklung. Von Roland Brinkmann. Abh. der Gesellsch. Wissensch. zu Göttingen, Math.-Phys. Kl., N.F., xiii, 3, 1929.
W. J. A.
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01 May 2009, pp. 373-376
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Index
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01 May 2009, pp. 561-565
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Grundprobleme der Geologie, eine Einführung in geologisches Denken. By Serge Von Bubnoff. pp. viii + 237, with 48text-figures. Berlin: Borntraeger, 1931. Price 11·60 R.M.
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01 May 2009, pp. 522-523
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Engineering Geology. By H. Ries and T. L. Watson. Fourth edition. pp. vi + 708, with 253 figures. New York Wiley; London: Chapman and Hall. 1931. Price, 25s.
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01 May 2009, p. 476
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A Year on the Great Barrier. Reef. By C. M. Yonge. London: Putnam. 21s.
H. C. D.
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01 May 2009, p. 188
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GEO volume 68 issue 9 Front matter
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01 May 2009, pp. f1-f6
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Salt-Plugs
E. B. Bailey
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01 May 2009, pp. 335-336
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Larger Foraminifera from the Tertiary of Somaliland.
L. M. Davies
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01 May 2009, p. 238
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The Turoka Series of East Africa and the Nachipere Series of Nyasaland
F. Dixey
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01 May 2009, pp. 282-285
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InTheGeologicalMagazine of November last, Dr. John Parkinson, referring to my paper on the “Geology of the Lower Shire—Zambezi Area ”, advanced reasons for regarding the Nachipere Series of Nyasaland as being younger than the Turoka Series of East Africa.

The Geology of the Country between Gatooma and Battlefields. By A. M. Macgregor. Southern Rhodesia Geological Survey, Bulletin 17. Salisbury, 1930. 4s. 9d.
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01 May 2009, p. 189
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GEO volume 68 issue 12 Front matter
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01 May 2009, pp. f1-f6
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East Yorkshire: A Study in Agricultural Geography. By S. E. J. Best. Longmans Green.
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01 May 2009, p. 286
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The Geology Of The Maryport District. Expl. Sheet 22, Mem. Geol. Survey. By T. Eastwood. Pp. viii + 137, with 3 plates and 19 text-figures. 1930. Price 3s.
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01 May 2009, p. 41
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Geological Surveys in S.E. Asia.
J. B. Scrivenor
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01 May 2009, p. 239
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Geology of Petroleum. By W. H. Emmons. Second edition. pp. xi + 736, with 435 text-figures. London: McGraw-Hill Co., 1931. Price, 30s.
James Romanes
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01 May 2009, pp. 476-477
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GEO volume 68 issue 7 Front matter
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01 May 2009, pp. f1-f6
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The Age of the Earth. Bulletin of the National Research Council. pp. 487. Washington, D.C., 1931.
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01 May 2009, pp. 523-525
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Volume 68 - August 1931

Original Articles

A Comparison of the Methods of Heavy Mineral Separation

Reviews

Scandinavian Trinucleidae, with special reference to Norwegian species and varietes. By Leif Störmer. Skrift. Norske Vidensk.-Akad. Oslo. I, Mat.-Nat. Klasse, No. 4, 1930. Pp. 111; pls. xiv; text-figures 47.

The Structure Of Asia. Edited by J. W. Gregory. vi + 227 Pp., with 23 plates and 17 figures in the text. London: Methuen and Co. 1929. 10s.

Statistisch-Biostratigraphische Untersuchungen an Mitteljurassischen Ammoniten über Artbegriff und Stammesentwicklung. Von Roland Brinkmann. Abh. der Gesellsch. Wissensch. zu Göttingen, Math.-Phys. Kl., N.F., xiii, 3, 1929.

Index

Index

Reviews

Grundprobleme der Geologie, eine Einführung in geologisches Denken. By Serge Von Bubnoff. pp. viii + 237, with 48text-figures. Berlin: Borntraeger, 1931. Price 11·60 R.M.

Engineering Geology. By H. Ries and T. L. Watson. Fourth edition. pp. vi + 708, with 253 figures. New York Wiley; London: Chapman and Hall. 1931. Price, 25s.

A Year on the Great Barrier. Reef. By C. M. Yonge. London: Putnam. 21s.

Front matter

GEO volume 68 issue 9 Front matter

Correspondence

Salt-Plugs

Larger Foraminifera from the Tertiary of Somaliland.

Original Articles

The Turoka Series of East Africa and the Nachipere Series of Nyasaland

Reviews

The Geology of the Country between Gatooma and Battlefields. By A. M. Macgregor. Southern Rhodesia Geological Survey, Bulletin 17. Salisbury, 1930. 4s. 9d.

Front matter

GEO volume 68 issue 12 Front matter

Reviews

East Yorkshire: A Study in Agricultural Geography. By S. E. J. Best. Longmans Green.

The Geology Of The Maryport District. Expl. Sheet 22, Mem. Geol. Survey. By T. Eastwood. Pp. viii + 137, with 3 plates and 19 text-figures. 1930. Price 3s.

Correspondence

Geological Surveys in S.E. Asia.

Reviews

Geology of Petroleum. By W. H. Emmons. Second edition. pp. xi + 736, with 435 text-figures. London: McGraw-Hill Co., 1931. Price, 30s.

Front matter

GEO volume 68 issue 7 Front matter

Reviews

The Age of the Earth. Bulletin of the National Research Council. pp. 487. Washington, D.C., 1931.

Geological Magazine

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Volume 68 - August 1931

Original Articles

Reviews

Index

Reviews

Front matter

Correspondence

Original Articles

Reviews

Front matter

Reviews

Correspondence

Reviews

Front matter

Reviews