ISSN:0016-786X    

DOI:10.1080/11035896209447301

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

Lectotype and paratypes ofPteronitella retroflexa(Wahlenberg) are selected and described, and from comparisons made with Sowerby's figured specimen and other material from the Welsh Borderland, it is concluded that all these forms are conspecific.

ISSN:0016-786X    

DOI:10.1080/11035896209447302

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

In Lake Gallejaure there occur deposits of muddy silt partly intercalated with varved fine-grained sediments under about 20 m of till and other glacial deposits. The muddy silt contains fresh-water diatoms and a pollen flora indicating an open birch forest of probably subarctic character. It may be a fragmentary interglacial deposit but most likely can be correlated with some Early Weichselian interstadial. The radiocarbon dating of the deposit gave an age of more than 35 000 years.

ISSN:0016-786X    

DOI:10.1080/11035896209447303

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

After discussing the mathematical conditions a cumulative curve must satisfy, and some conceivable possibilities of approximating these curves with elementary functions, the authors describe a numerical method of obtaining cumulative curves by interpolation with polynomials, based on Lagrange's formula. From the cumulative curves, the frequency curves and statistical data are computed. The results are obtained in form of tables. Another method has been developed for statistical analysis of a deposit. This method is designed to compute and compare the statistical measures, in interval for interval, in a number of samples. To illustrate these methods, size frequency distributions of rock chippings obtained by jackhammer borings through a weathered fault zone, and variations of a deposit of coarse gravel are briefly discussed.

ISSN:0016-786X    

DOI:10.1080/11035896209447304

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035896209447305

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

The red deer,Cervus elaphus elaphusLinnaeus, has probably been extinct on the Isle of Öland in the Baltic since about 1800, and very few subfossil remains have been found. The antlers described here were found under unknown circumstances in the fen complex of Skede Mose, parish of Köping. A small sample of detritus substance from the cranium has been used for a cautious dating by means of pollen analysis; the sample agrees with the pollen spectrum found in the middle of zone VII according to Jessen and Fries or slightly before,i. e.ca. 6 200 years before present (Atlantic, Litorina, and Ertebolle Time according to different scales).

ISSN:0016-786X    

DOI:10.1080/11035896209447306

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

Magnetite-bearing cavities in rhyolitic effusives and sulfide-bearing miarolithic cavities in acid intrusives are taken as natural models of epigenetic Fe—Cu—Zn—Pb ores. Corresponding mineral equilibria and some of their limitations are reviewed. Mineral sequences suggest that pH varied during mineral formation as from 12–9 above 300° C to about 6 at 100° C. Paragenetical considerations indicate that halogen acids are not essential in the formation of Fe—Cu—Zn—Pb ores. The role of carbonic acid is discussed and a hypothesis on the critical role of carbonate-complexes is advanced. It is pointed out that any formation process involving decomplexing and precipitation would give rise to replacement relations or the type seen in ore minerals, and that prior to mineral deposition, ore-solutions are unsaturated in ore constituents and therefore able to extract them from traversed wallrock.

ISSN:0016-786X    

DOI:10.1080/11035896209447307

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

“The aurochs(Bos primigenius L)in Sweden” concerns all known subfossil finds of this animal in Sweden with respect to their regional and stratigraphical site and their geological age. About 3/4 of them are found in Scania, the southernmost province of Sweden; the rest comes from the region south of the great lakes of middle Sweden. On the table fig. 13, the finds are ranged as to their geological age. The main bulk belongs to the Ancylus age, about 6 000-7 500 B.C. Supported by his investigations of historical sources, verbal popular traditions, and the ethymology of names of lakes, mountains and villages with the profix ur-(ofswed.ur-oxe) the author supposes thatBos primigeniuslived i Southern Sweden until about 1 300 A.D.

ISSN:0016-786X    

DOI:10.1080/11035896209447308

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035896209447309

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035896209447310

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor