摘要:

Measurements of the particle size of some Ordovician limestones from Öland and the Siljan district of Sweden have been made on thin slides by means of a micrometer according to the method of Delesse-Rosiwal. The percentage of fossil fragments (other particles of sand size being very rare in the limestones studied) with a maximum length on the thin slide of more than 0,1 mm has been determined, distinguishing thereby between a »sand fraction» with particle size greater than 0,1 mm and a »groundmass» of finer grains including the secondarily cementated pore spaces. The procedure described allows a rough comparison of different kinds of sedimentary limestones according to their general coarseness. The terms of Grabau (1901), calcarenite and calcilutite, originally intended only for elastic limestones, are recommended for use as strictly granulometrical terms for all types of sedimentary limestones in which the original form of the particles has not been destroyed by recrystallization. It seems preferable to draw the limit between calcarenite and calcilutite at about 20% of the »sand fraction» in limestone. — The limestones studied included various types of coarseness.

ISSN:0016-786X    

DOI:10.1080/11035895209453360

出版商:Taylor & Francis Group    

年代:1952

数据来源: Taylor

摘要:

The paper deals with marine Quaternary shell occurrences in the Swedish provinces of Värmland, Dalsland, Västergötland, and Halland and their fauna, chiefly molluses. The material is kept in the Paleozoological Department of the Swedish Museum of Natural History (Riksm.) and in the Geological Survey of Sweden (S. G. U.).

ISSN:0016-786X    

DOI:10.1080/11035895209453361

出版商:Taylor & Francis Group    

年代:1952

数据来源: Taylor

摘要:

A number of glacifluvial channels in South Sweden are described and the consequences of the hypothesis of the formation of some ice-dammed lakes are discussed.

ISSN:0016-786X    

DOI:10.1080/11035895209453362

出版商:Taylor & Francis Group    

年代:1952

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035895209453363

出版商:Taylor & Francis Group    

年代:1952

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035895209453364

出版商:Taylor & Francis Group    

年代:1952

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035895209453365

出版商:Taylor & Francis Group    

年代:1952

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035895209453366

出版商:Taylor & Francis Group    

年代:1952

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035895209453367

出版商:Taylor & Francis Group    

年代:1952

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035895209453368

出版商:Taylor & Francis Group    

年代:1952

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035895209453369

出版商:Taylor & Francis Group    

年代:1952

数据来源: Taylor