Sample index parameters (intact chalk data shown in italics)
| SNW-A | SNW-B | SOM-A | SOM-B | |
|---|---|---|---|---|
| Formation | Seaford | Seaford | Newhaven | Newhaven |
| Mean IDD: Mg/m3* | 1·57 ± 0·08 | 1·57 ± 0·08 | 1·47 ± 0·02 | 1·47 ± 0·02 |
| Calcium carbonate content: %† | ≈98·2 | ≈98·2 | ≈98·5 | ≈98·5 |
| Crushing method | A | B | A | B |
| Liquid limit: % | 29 | 28 | 30 | 31 |
| Plastic limit: % | 22 | 22 | 23 | 22 |
| d50: μm | 4·8 | 4·9 | 5·4 | 4·7 |
| d10: μm | 1·4 | 1·4 | 1·5 | 1·5 |
| d60/d10 | 5·1 | 4·8 | 5·0 | 4·3 |
| SNW-A | SNW-B | SOM-A | SOM-B | |
|---|---|---|---|---|
| Calcium carbonate content: % | ≈98·2 | ≈98·2 | ≈98·5 | ≈98·5 |
| Crushing method | A | B | A | B |
| Liquid limit: % | 29 | 28 | 30 | 31 |
| Plastic limit: % | 22 | 22 | 23 | 22 |
| 4·8 | 4·9 | 5·4 | 4·7 | |
| 1·4 | 1·4 | 1·5 | 1·5 | |
| 5·1 | 4·8 | 5·0 | 4·3 |
IDD = intact dry density; measured using gas jar method by Clayton (1983).
Based on Hancock (1975).
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