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Geologic Maps

Geologic Maps. What the Colors Mean. Each color refers to the time period that the rock unit formed. What the Letters Mean. Each of the letters refers to some thing specific The first letter refers to when the rock unit formed The next one to two letters refer to the name of the rock unit

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Geologic Maps

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  1. Geologic Maps

  2. What the Colors Mean • Each color refers to the time period that the rock unit formed What the Letters Mean Each of the letters refers to some thing specific The first letter refers to when the rock unit formed The next one to two letters refer to the name of the rock unit The last one to two letters refer to the type of rock KMns for the Cretaceous Monach Formation sandstone

  3. What the Letters Mean • Each of the letters refers to some thing specific • The first letter refers to when the rock unit formed • The next one to two letters refer to the name of the rock unit • The last one to two letters refer to the type of rock KMns for the Cretaceous Monach Formation sandstone

  4. What the Patterns Mean • The different patterns represent different rock types • These are used mostly on cross-sections • Occasionally used on geologic maps, but when they are, there are no contour lines.

  5. Sedimentary Igneous Metamorphic Conglomerate Breccia Sandstone Siltstone Shale Dolostone Limestone Basalt Granite Intrusive Igneous Extrusive Igneous Quartzite Slate Gneiss Schist

  6. What the Symbols Mean Geologic Contact Normal Fault Thrust fault Non-specific Fault Strike-slip fault 25 Strike and dip

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