摘要:

In connection with my previous till studies, some problems only concerning the distribution of the limestone material are discussed.

ISSN:0016-786X    

DOI:10.1080/11035896709448380

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

The concept of myrmekite development by exsolution processes akin to and connected with exsolution perthite formation is finding increasing support. An attempt is made to develop, in terms of solid-state transformational stages, a theoretical model for the process which explains the known features of the exsolution myrmekites and the related perthites. A high-temperature alkalic ternary feldspar is considered to be a heterotype solid-solution, the calcium, solute being vacancy stabilised. The importance of the solute-vacancy association to diffusion is discussed. Initial exsolution at lattice disarray sites is activated by the decreasing stable concentration of vacancies with decreasing temperature. Available lattice disarray sites are internal dislocation type defects and the crystal periphery and at these sites there is nucleation and growth of plagioclase and free quartz as vacancies are annihilated:

ISSN:0016-786X    

DOI:10.1080/11035896709448381

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

A fast method of staining silica-rich parts in Cretaceous limestone is described in the present paper. After treatment according to the method described these parts become strongly coloured. This method has been used to examine 1500 metres of core. The cores have been photographed in colour. The boring record has been illustrated with these photographs.

ISSN:0016-786X    

DOI:10.1080/11035896709448382

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Pieces of a light, rounded mass from till of Cambro-Silurian rocks in the province of Jämtland have been investigated with X-ray and chemical analyses. The results indicate that the material consists of weathered stinkstone from the Cambrian shales.

ISSN:0016-786X    

DOI:10.1080/11035896709448383

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Extrapolation from a simulation model which mimics some ecologic complex to an analogous paleoecologic situation offers hitherto unavailable opportunities for the reconstruction of ancient environments. Systems analysis will not give a single correct answer to a particular problem, but instead yields a set of answers, some of which will be more plausible and better descriptive of the situation being studied. Experiments with models cannot substitute for experiments with real systems and that any finding based on models should be tested against real experiments. Nevertheless, inability to construct a model in agreement with a given theory may be evidence against that theory. A computer model has the undeniable strength, that it is able to organize large bodies of material into a workable whole. Thus, in paleoecology, a mass of ecologic information becomes accessible in quantitative form, that otherwise would not have been retrievable data.

ISSN:0016-786X    

DOI:10.1080/11035896709448384

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

On the island of Hisingen, 17 km to the north of Gothenburg on the west coast of Sweden, a breccia was exposed after removing 3.5 m Quaternary deposits. The breccia occupied two fissures in the Precambrian rocks. The fissures were 0.5 and 3 m wide, respectively, and the observed length approximately 6 m. They struck N 68° W and had a vertical dip. The breccia consisted of big boulders of limestone, stinkstone-concretions, sandstone, and weathered remnants of alum shale. There were also fragments of gneisses and amphibolite. The main part of the breccia material belongs to the Cambrian. The fossil content of the breccia will be treated in a separate paper by Dr. A. Martinsson, Uppsala. The big, unbroken stinkstone-concretions (c. 1 m in diametre) and the big boulders of limestone with preserved bedding indicate a short transport of the material before being deposited in the fissures.

ISSN:0016-786X    

DOI:10.1080/11035896709448385

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

A large temporary ditch excavation made in April, 1967 in the Rävatofta district (west-central Scania) exposed a section through the local bedrock of which excavated material has been investigated.

ISSN:0016-786X    

DOI:10.1080/11035896709448386

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

When discussing the relationship between lithology and faunal distribution patterns in a part of the Ooser Plattenkalk-sequence (Upper Devonian, Adorf-Stufe, Eifel Mountains, Germany), Böger (1966) quoted that neither the theory of Krebs 1962 (interchange of shallow and deeper marine environments) nor the interpretation of Meischner 1964 (intercalation of calcareous turbidites, “allodapic limestones”) is satisfactory.

ISSN:0016-786X    

DOI:10.1080/11035896709448387

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

ISSN:0016-786X    

DOI:10.1080/11035896709448388

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

ERNST VOLLMER: Encyclopedia of Hydraulics, Soil and Foundation Engineering. Elsevier, Amsterdam, London, New York 1967. 398 pp. Pris Dfl 50,—. Reviewed by Sven Fredén

ISSN:0016-786X    

DOI:10.1080/11035896709448389

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor