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Compilation of data for Figure 7. Estimated thickness of Umpqua Group strata immediately north and south of the study area and east of the Umpqua River as shown in Figure 1. Map distances and bedding dips are based on the Garden Valley 7.5’ Geologic Quadrangle .
| Umpqua Group units | Average map distance (m) |
Dip of strata |
Average dip |
Thickness estimate (m) |
| White Tail Ridge Formation (½ the syncline) |
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| Tums: mudstone dominated thin turbidites |
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| Tuss: sandstone dominated turbidites, thick to massive |
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| Tum: mudstone |
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| Tuss: sandstone dominated turbidites, thick to massive bedded | 1220 |
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| Estimated thickness total |
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