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A perennially frozen horizon in mineral or organic material (permafrost). The permafrost logic is shared with cryic_conditions; this exposes it under the canonical WRB 2022 horizon name so that coverage_report("wrb_horizons") reports it, and returns a DiagnosticResult named "cryic".

Usage

cryic_horizon(pedon, ...)

Arguments

pedon

A PedonRecord.

...

Passed to cryic_conditions (e.g. max_top_cm, max_temp_C).

Value

A DiagnosticResult.

References

IUSS Working Group WRB (2022), Chapter 3.1.8, Cryic horizon.