Schematic cross section relationships of intrusive and country rocks.

Here are schematically depicted relationships between an intrusive body (the red rock) and surrounding sedimentary 'country' rocks.

• A -> shales (fine grained sedimentary rock).
• B -> limestones (marine sedimentary rock).
• C-> altered rock A and B adjacent to the intrusion, recrystallized with new minerals that grow at higher temperatures.
• D -> the main body of the intrusive rock (a stock, pluton or batholith).
• E -> xenolith, a piece of surrounding rock embedded within the intrusive rock.
• F -> a dike, a discordant tabular (sheet-like) intrusion.
• G -> a sill, a concordant tabular intrusion.

What do these relationships indicate about the initial physical state of the red rock when it formed?

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