% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/diagnostics-conditions-usda.R
\name{glacic_layer_usda}
\alias{glacic_layer_usda}
\title{Glacic layer (USDA Soil Taxonomy, 13th edition)}
\usage{
glacic_layer_usda(pedon, max_top_cm = 100, min_thickness_cm = 30)
}
\arguments{
\item{pedon}{A \code{\link{PedonRecord}}.}

\item{max_top_cm}{Maximum top depth (default 100 cm; subgroup-level
depth bound).}

\item{min_thickness_cm}{Minimum thickness (default 30 cm).}
}
\value{
A \code{\link{DiagnosticResult}}.
}
\description{
"A glacic layer is massive ice or ground ice in the form of ice
lenses or wedges. The layer is 30 cm or more thick and contains 75
percent or more visible ice."  -- KST 13ed, Ch 3, p 45.
}
\details{
Diagnostic for the Glacistels great group of Histels and the
Glacic subgroup modifier in Gelisols.

Implementation (v0.8.x): Detected via designation containing
'ff' (massive ice) per KST notation, with thickness >= 30 cm.
Refinement to use an \code{ice_pct} schema column is deferred
to v0.9.
}
\references{
Soil Survey Staff (2022), KST 13ed, Ch. 3, p 45.
}
