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| Hoedemaeker, Ph.J.. |
| In the first part of this publication an attempt is made to bring some order in the terminological chaos existing in the field of delapsion, which is the independent gravitating of rock material along sloping surfaces. The term olisthon is introduced for everything that has been delapsed. For the purpose of a rational and comprehensive classification of geological phenomena delapsion is introduced as a separate class between tectonization and sedimentation. Special emphasis is laid upon the concepts of olisthostrome and olistholith, which are redefined. The principles of the mechanics involved in delapsional processes are discussed. In the second part emphasis is laid upon the description of the olisthostromes, olistholiths, reversely graded mud flow and... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.25. |
| Ano: 1973 |
URL: http://www.repository.naturalis.nl/record/317502 |
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| Kriegsman, L.M.. |
| Petrological collections result from sampling for academic research, for aesthetic or commercial reasons, and to document natural diversity. Selection criteria for reducing and enhancing collections include adequate documentation, potential for future use, information density, time and money invested in specimens, and spatial and financial constraints. Application of these criteria to the voluminous (c. 300,000 samples) rock collections of the University of Amsterdam, led to partial acquisition by the Nationaal Natuurhistorisch Museum in Leiden (Naturalis) late in 2002. Selected items included: (i) historical collections; (ii) material from former overseas domains; (iii) material from poorly accessible areas; (iv) material useful for research at the museum... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Geology; Petrology; Collections; Selection; De-selection; De-accessioning; 38.25. |
| Ano: 2004 |
URL: http://www.repository.naturalis.nl/record/215464 |
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