| Unit | Description |
| PR | Mottled clay and silt with some sand, sparse carbonate nodules, and occasional pebbles. This unit is defined as a mixed zone resulting from root bioturbation and agricultural tilling. The unit extends across the upper 10-20 cm of both walls of the trench exposure. Color: 5Y 4/2 (gray/brown) |
| PTW1 | Clayey silt with moderate root-bioturbation and some carbonate nodules. Color: 10YR 4/1 (gray/brown) |
| PTW1.5 | Very thin matted unit of decayed organics, topped by a thin horizon of sand, carbonate nodules, and sparse pebbles. Apparently vertically offset by the primary fault zone. Color: 10YR 4/1 |
| PTW2 | Silty sand intermixed with dark organic units of the west side of the primary fault zone. Color: 5YR 6/2 (light tan) |
| PTW3 | Organic rich clayey silt mixed with sparse sand and carbonate nodules. Color: 5YR 2.5/2 (dark brown) |
| PTW4 | Mottled clay with sands and silt (pedogenic clay). Color varies. |
| PTW5 | Clay with carbonate nodules, color: 2.5Y 5/2 (green/brown/gray) |
| PTE0 | Dark organic mottled clay mixed with sparse sand pockets, carbonate nodules, clay shear zones, roots, pebbles, and small cobbles. |
| PTE1 | Thick bioturbated mixture of silt, sand, clay, and gravel. Fresh and old Kordivinas. Thins towards deformation zone. Color: 10YR 8/2 (pale tan to orange) |
| PTE2 | Sand silt that thins and pinches out towards the deformation zone. Color: 2.5Y 6/6 (orange, rust color) |
| PTE3 | Coarse gravel lenses of varying thickness and extent, paleochannels of Little Cholame Creek lumped as one unit. Clasts include Monterey, Franciscan, and quartz pebbles. Color: 7.5YR 7/3 |
| PTE4 | Fine sand lenses, with some gravels. More paleochannels. Could be lumped with PTE3. Color: 2.5Y 4/4 |
| PTE5 | Laminated clay with thin charcoal horizon. Color: 5Y 4/2 |
| PTE6 | Fine sand and silt. Varies in thickness through the fault zone. Color: 5Y 4/4 (brown) |
| PTE7 | Laminated clay with thin charcoal horizon. Color: 5Y 4/2 |
| PTE8 | Clayey sand. Color: 2.5Y 4/2 (brown) |
| PTE9 | Laminated clay with thin charcoal horizon. Color: 5Y 4/2 |
| PTE10 | Very fine clayey sand. Color: 2.5Y 4/2 (brown) |
| PTE11 | Dark brown/gray unit composed of charcoal (thick). Excellent reference layer through fault zone splays as it is crisply faulted. Color: 10Y 2/1 |
| PTE12 | Fine sand with some clay. Color: 2.5Y 4/4 |
| PTE13 | Dark brown/gray thick clay and charcoal. Color: 10YR 2/2 |
| PTE14 | Light brown and grey clay with carbonate nodules. Color: 5GY 4/1 |
| PTE15 | Sandy silty gray clay. Color: 5G 4/1 |
| PTE16 | Matrix supported well-sorted small pebble gravel layer, poorly exposed at base of trench. |