Geology Sorting Coefficient Folk Ward Calculator
Folk–Ward inclusive graphic PHI sorting, not Trask diameter quartiles. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.
Description
Folk–Ward inclusive graphic sorting combines central and tail spreads on the phi scale.
Folk–Ward inclusive graphic sorting combines central and tail spreads on the phi scale.1
Both parts matter because two sediments can have similar central spread while differing in their distribution tails. Use this tool to calculate sorting coefficient folk ward from the supplied measurements and assumptions.
When to use Geology Sorting Coefficient Folk Ward Calculator
Use this tool to calculate sorting coefficient folk ward from the supplied measurements and assumptions. Establish the measurement units, sampled interval, calibration or model edition and geological assumptions before entering data.
How to use Geology Sorting Coefficient Folk Ward Calculator and understand its results
- Establish the measurement units, sampled interval, calibration or model edition and geological assumptions before entering data.
- Enter phi5, phi16, phi84, phi95, using the field meanings and rules below, then run the tool.
- Read graphicSorting. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| phi5 | Phi5 | number | Required |
| phi16 | Phi16 | number | Required |
| phi84 | Phi84 | number | Required |
| phi95 | Phi95 | number | Required |
Supply finite nondecreasing phi5, phi16, phi84 and phi95 values. Add the central spread divided by 4 to the tail spread divided by 6.6. Equal percentiles are permitted, and a zero spread returns zero rather than an input error.
sorting=(phi84−phi16)/4+(phi95−phi5)/6.6 Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| graphicSorting | Graphic Sorting; follow the units, sign, ordering and evidence convention stated above | number |
{
"input": {
"phi5": -2,
"phi16": -1,
"phi84": 1,
"phi95": 2
},
"output": {
"graphicSorting": 1.106060606060606
}
}Limitations and assumptions
Both parts matter because two sediments can have similar central spread while differing in their distribution tails. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use Geology Wentworth Phi To Mm Calculator for this related task: The phi grain-size scale is logarithmic, with increasing phi corresponding to decreasing diameter.
Use Geology Wentworth Grain Size Phi Calculator when its separate inputs and assumptions fit the question: A phi value is the negative base-two logarithm of grain diameter measured in millimeters.
References
Similar or alternative tools
- Geology Wentworth Phi To Mm Calculator
The phi grain-size scale is logarithmic, with increasing phi corresponding to decreasing diameter.
- Geology Wentworth Grain Size Phi Calculator
A phi value is the negative base-two logarithm of grain diameter measured in millimeters.