Based on the geologic column (diagram), the oldest rock would be found in: Layer O.
A geologic column can be defined as a collection of rock layers that are typically grouped based on their relative ages in an ascending order, usually from the youngest layer to the oldest.
In a geologic column, the youngest layer is usually at the top while the oldest layer is at the bottom.
Hence, each lower layer of a rock is older than the rock layers above it.
Based on the geologic column (diagram), the rock layer which is most likely to be the oldest rock is layer O because the youngest rock is at layer L i.e it sits on top (far left).
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