In the 1930s the Russian geologist V.P. Nekhoroshev marked out intermontane depressions in the
Altai which might get completely filled by glaciers from the surrounding mountains at the maxima of glaciation. He called such depressions "ledoyoms". Ledoyoms produced large valley
glaciers within outlet runoff valleys from the depressions at culmination stages of their development. Diagnostic marks of the so-called classical ledoyoms are
moraines,
eskers and
kames on the bottoms of the corresponding depressions. ==References==