Start Relative dating of rocks ppt

Relative dating of rocks ppt

These indicators separate rocks into igneous, sedimentary and metamorphic.

For example, a geologist may examine a cutting where the rocks appear as shown in Figure 1.

Here he can see that some curved sedimentary rocks have been cut vertically by a sheet of volcanic rock called a dyke.

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In this period a number of comprehensive cosmogonies were proposed.

These were long on armchair speculation and short on substantive supporting evidence.

Calcite is most common in limestones, as these consist essentially of calcium carbonate; quartz is common in sandstones and in certain igneous rocks like granite which contain a high percentage of silica.

Two rock masses may have very much the same bulk composition and yet consist of entirely different assemblages of minerals.

Composition of minerals varies from one mineral to another.