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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Europe
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Western Europe
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United Kingdom
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Great Britain
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England
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Newcastle England (1)
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Northumberland England (1)
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Primary terms
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Europe
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Western Europe
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United Kingdom
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Great Britain
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England
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Newcastle England (1)
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Northumberland England (1)
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geophysical methods (1)
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rock mechanics (1)
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Region 12, Precambrian Shield
Abstract The Precambrian Shield represents the largest petrologically homogeneous and contiguous province of the North American continent. Crystalline metamorphic rocks underlie most of the Shield, and structural provinces are defined on the basis of age, lithology, and structural features. In places, relatively unmetamorphosed igneous rocks or indurated sedimentary rocks are predominant, but all have more or less the same hydrogeologic characteristics in that fractures control the occurrence and flow of ground water. The extent of the Precambrian Shield Hydrogeologic Region is shown on Figure 1. The boundaries are defined on Fig. 3 and Table 2 of Heath (this volume). In general, the boundaries are rather easy to determine, and this portion of the Precambrian Shield is a well-defined ground water region.