Potential answers for "Clay layer under soil"

⭐⭐⭐⭐ HARDPAN
⭐⭐⭐ LOAM
⭐⭐⭐ SOLUM
⭐⭐⭐ LOAMS
⭐⭐⭐ MARL
⭐⭐⭐ PERMAFROST
⭐⭐⭐ LOAMY

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