Obsidian Hydration Rind Age
Evaluate a caller calibrated squared-rind hydration age subtracting inherited squared growth, not rind width linearly; effective hydration rate is environment/composition-specific.
Description
Obsidian hydration models often relate squared rind thickness to time.
Obsidian hydration models often relate squared rind thickness to time. Removing inherited squared growth differs from simply subtracting rind widths before squaring.1
Evaluate a caller calibrated squared-rind hydration age subtracting inherited squared growth, not rind width linearly; effective hydration rate is environment/composition-specific.
When to use Obsidian Hydration Rind Age
Use this tool to evaluate a caller calibrated squared-rind hydration age subtracting inherited squared growth, not rind width linearly; effective hydration rate is environment/composition-specific.
Prepare the artifact, site or survey measurements and any independently established calibration or model choices. Keep paired observations aligned and confirm units and coordinate conventions.
How to use Obsidian Hydration Rind Age and understand its results
- Prepare the artifact, site or survey measurements and any independently established calibration or model choices. Keep paired observations aligned and confirm units and coordinate conventions.
- Enter measuredRindMicrometers, inheritedRindMicrometers, hydrationSquaredMicrometersPerYear using the field table and calculation rules, then run the tool.
- Read hydrationAgeScenarioYears. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| measuredRindMicrometers | Measured rind micrometers | number | Required |
| inheritedRindMicrometers | Inherited rind micrometers | number | Required |
| hydrationSquaredMicrometersPerYear | Hydration squared micrometers per year | number | Required |
Supply nonnegative measured and inherited rind thicknesses in μm, with inherited no greater than measured, and a positive calibrated rate in μm²/year. Evaluate the factored difference of squares and return a nonnegative age scenario in years. Equal thicknesses give zero age.
age = (measured−inherited)(measured+inherited)/hydrationRate Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| hydrationAgeScenarioYears | Hydration age scenario years | number |
{
"input": {
"measuredRindMicrometers": 3,
"inheritedRindMicrometers": 1,
"hydrationSquaredMicrometersPerYear": 2
},
"output": {
"hydrationAgeScenarioYears": 4
}
}Limitations and assumptions
The effective rate must match composition and environmental history. Temperature, moisture and calibration uncertainty are not inferred, and the result is a model scenario rather than independently established dating.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use OSL Age: Infer residual-corrected OSL age with independent dose/rate uncertainties, retaining signed residual nondetections; assumes full resetting and constant effective dose rate, not a validated burial age. For a complementary task, use Amino Acid Racemization Age: Infer symmetric reversible amino-acid racemization age from D/L using caller effective rate and initial ratio; assumes a closed system/fixed kinetic history, not a generic biological age.
References
-
Obsidian Hydration Rind Age — tool.io
Similar or alternative tools
- OSL Age
Infer residual-corrected OSL age with independent dose/rate uncertainties, retaining signed residual nondetections; assumes full resetting and constant effective dose rate, not a validated burial age.
- Amino Acid Racemization Age
Infer symmetric reversible amino-acid racemization age from D/L using caller effective rate and initial ratio; assumes a closed system/fixed kinetic history, not a generic biological age.