Crossword puzzle clue "geological layer"

Here are the possible solutions for geological layer clue

Answer
Clue
Relevancy
crust
Clue
Geological layer
Topmost geological layer
Definition
to form a hardened outer surface
mantle
Clue
Geological layer that's about 1,800 miles thick
Definition
to cover as with a cloak
seam
Clue
Geological layer, as of coal
icing
Clue
Layer-cake layer
Definition
a sweet mixture for covering cakes
strata
Clue
Layer upon layer
tier
Clue
Layer cake layer
aeon
Clue
Geological period
Definition
the largest division of geological time, composed of several eras, also EON

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