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By Author B. Sander

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G. formation of an ore) and in the fabric, is 2a SFG- 24 THE STUDY OF FABRICS OF GEOLOGICAL BODIES. PART I associated with the same major period within one and the same geological time-space (cooling granite plus cover), but in different localities as a physically simultaneous event, in the same locality as physically non-simultaneous; hence the time is as necessary as the place within the major time-space for the understanding and practical evaluation of a particular structure (a rock or an ore-deposit).

From this it follows that deformation restricted in time and mechanical deformation restricted by an anisotropy already present accompany each other; and the same holds for unrestricted deformation. Hence the expression of an extant strength-anisotropy and of crystallizations as indirect componental movements are characteristic of step-by-step unrestricted autonomous mechanical deformation or tectonics, as seen for example in geological bodies if they change in size and shape sufficiently slowly under the influence of gravity or hydrostatic pressure.

We here encounter a fundamental problem of geology, that of the relationship between the facies of major fabrics and the subdivision of geological time. Time features and rhythm in resedimented fabrics Detrital sediments can often be related to a particular part nt rock as the result of a continuous period of erosion. Further, the various divisions of the detrital rock succession can be related to several phases of uplift following one another rhythmically, not to a single particular one during which the uplifted material is eroded; the rock which yields the detrital INTRODUCTION TO CONCEPTS 23 sediments is, in this case, not one of completely new origin but always a newly uplifted one.

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