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CHERT DIS CBT

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Plate I. Geologic map of North America In box

Figure 1 . Sketch map showing the distribution of post-Cambrian intrusive rocks represented on the geologic map

of North America . , . 18

2. Sketch map showing the distribution of Tertiary and later effusive rocks represented on the geologic

map of North America 19

3. Sketch map showing the distribution of pre-Cambrian rocks represented on the geologic map of

North America and the key to references in the text 63

4. Classification of the pre-Cambrian adopted by the International Committee 67

5. Sketch map showing the distribution of Cambrian and lower Ordo-vician rocks represented on the

geologic map of North America and the key to references in the text 73

6. Sketch map showing the distribution of middle and upper Ordovician rocks represented on the

geologic map of North America and the key to references in the text 157

7. Sketch map showing the distribution of Silurian rocks represented on the geologic map of North

America and the key to references in the text 226

8. Sketch map showing the distribution of Devonian rocks represented on the geologic map of North

America and the key to references in the text 270

9. Sketch map showing the distribution of Paleozoic rocks that are undivided on the geologic map of

North America and the key to the references in the text 343