Foraminifera Test Coiling Ratio Percent

Report observed foraminiferal coiling proportions with ambiguous tests retained on the full denominator; chirality alone does not infer temperature or a species identity.

Description

Foraminiferal coiling direction is an observed classification.

Foraminiferal coiling direction is an observed classification. Ambiguous tests affect coverage without entering the classified denominator.

Report observed foraminiferal coiling proportions with ambiguous tests retained on the full denominator; chirality alone does not infer temperature or a species identity.

When to use Foraminifera Test Coiling Ratio Percent

Use this tool to report observed foraminiferal coiling proportions with ambiguous tests retained on the full denominator; chirality alone does not infer temperature or a species identity.

Prepare the fossil measurements or occurrence records and the chosen calibration parameters. Retain the stated coordinate, age and measurement conventions.

How to use Foraminifera Test Coiling Ratio Percent and understand its results

Prepare the fossil measurements or occurrence records and the chosen calibration parameters. Retain the stated coordinate, age and measurement conventions.
Enter leftCoiledCounts, rightCoiledCounts, ambiguousCoilingCounts using the field table and calculation rules, then run the tool.
Read leftPercentOfClassified, rightPercentOfClassified, ambiguousPercentOfAll. 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
leftCoiledCounts	Left coiled counts	integer	Required
rightCoiledCounts	Right coiled counts	integer	Required
ambiguousCoilingCounts	Ambiguous coiling counts	integer	Required

Use nonnegative integer counts with positive classified total. Return left and right percentages among classified and ambiguous percentage among all.^[1]

left percent = 100 × left/(left + right); ambiguous share uses all tests

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
leftPercentOfClassified	Left percent of classified	number
rightPercentOfClassified	Right percent of classified	number
ambiguousPercentOfAll	Ambiguous percent of all	number

json

{
  "input": {
    "leftCoiledCounts": 10,
    "rightCoiledCounts": 30,
    "ambiguousCoilingCounts": 10
  },
  "output": {
    "leftPercentOfClassified": 25,
    "rightPercentOfClassified": 75,
    "ambiguousPercentOfAll": 20
  }
}

Limitations and assumptions

Chirality alone does not identify species or infer temperature.

Numbers and computed results must be finite; overflow produces an error. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Raup Coil Log-Spiral W-D Parameters Solver: Fit logarithmic whorl radial expansion per full turn and report Raup-style D under explicit inner/outer radius convention; only W/D are estimated, not generating shape, axial translation or 3D reconstruction. For a complementary task, use Planktonic-Benthic Ratio Productivity Proxy: Correct planktic/benthic observed test counts for caller differential recovery and screen a ratio band; ratio is not a unique productivity or water-depth estimator.

References

Foraminifera Test Coiling Ratio Percent — tool.io

Similar or alternative tools

Raup Coil Log-Spiral W-D Parameters Solver
Fit logarithmic whorl radial expansion per full turn and report Raup-style D under explicit inner/outer radius convention; only W/D are estimated, not generating shape, axial translation or 3D reconstruction.
Planktonic-Benthic Ratio Productivity Proxy
Correct planktic/benthic observed test counts for caller differential recovery and screen a ratio band; ratio is not a unique productivity or water-depth estimator.