Limnic Subgroup helper (Histels)

Pass when one or more limnic layers (coprogenous earth / diatomaceous earth / marl) with cumulative thickness >= 5 cm occur within the control section (KST 13ed, p 190).

Usage

limnic_usda(pedon, min_thickness_cm = 5, max_top_cm = 130)

Arguments

pedon

A PedonRecord.

min_thickness_cm

Default 5.

max_top_cm

Default 130 cm (control section).

Value

A DiagnosticResult.

Details

Implementation: detects designation containing 'L' (KST notation for limnic) OR layer_origin == "lacustrine".

References

Soil Survey Staff (2022), KST 13ed, Ch. 3, p 45; Ch. 9 Hemistels / Sapristels.