Geology Varve Thickness Calculator
Actual sediment boundary intervals divided by independently verified annual lamina counts; annuality not inferred from visible banding. 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
A varve is an independently identified annual sedimentary layer or layer pair under the adopted counting convention.
A varve is an independently identified annual sedimentary layer or layer pair under the adopted counting convention.1
Dividing interval thickness by the counted varves estimates mean thickness per counted year within that interval. Use this tool to calculate varve thickness from the supplied measurements and assumptions.
When to use Geology Varve Thickness Calculator
Use this tool to calculate varve thickness 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 Varve Thickness Calculator and understand its results
- Establish the measurement units, sampled interval, calibration or model edition and geological assumptions before entering data.
- Enter observedBoundaryDepthsMm, callerVerifiedAnnualVarveCounts, using the field meanings and rules below, then run the tool.
- Read observedAnnualizedThicknessesMm. 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 |
|---|---|---|---|
| observedBoundaryDepthsMm | Observed boundary depths mm | list of number | Required |
| callerVerifiedAnnualVarveCounts | Caller verified annual varve counts; caller assertion or measurement requiring independent evidence | list of number | Required |
Enter strictly increasing boundary depths in millimeters and one positive integer annual-varve count per interval. Subtract consecutive depths and divide each difference by its count. Counts and the annual nature of the layers are independently verified inputs.
thicknessPerCountedYear_i=(depth_(i+1)−depth_i)/varveCount_i Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| observedAnnualizedThicknessesMm | Observed Annualized Thicknesses Mm; follow the units, sign, ordering and evidence convention stated above | list of number |
{
"input": {
"observedBoundaryDepthsMm": [
0,
2,
5
],
"callerVerifiedAnnualVarveCounts": [
1,
1
]
},
"output": {
"observedAnnualizedThicknessesMm": [
2,
3
]
}
}Limitations and assumptions
Dividing interval thickness by the counted varves estimates mean thickness per counted year within that interval. 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 Biostratigraphy Zone Thickness Calculator for this related task: A biozone thickness can be bounded when both its base and top have independent coordinate intervals.
Use Geology Biostratigraphy First Appearance Datum Calculator when its separate inputs and assumptions fit the question: A first observed fossil occurrence brackets detection within a sampled section rather than proving the organism's evolutionary origin.
References
-
Geology Varve Thickness Calculator — tool.io
Similar or alternative tools
- Geology Biostratigraphy Zone Thickness Calculator
A biozone thickness can be bounded when both its base and top have independent coordinate intervals.
- Geology Biostratigraphy First Appearance Datum Calculator
A first observed fossil occurrence brackets detection within a sampled section rather than proving the organism's evolutionary origin.