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Massive Intrusive Bodies: Batholiths, Stocks, and Laccoliths Batholiths By far the largest intrusive igneous bodies are batholiths (bathos 5 depth, lithos 5 stone).
Laccoliths A nineteenth-century study by G.
Gilbert named the igneous intrusions he observed laccoliths, which he envisioned as igneous rock forcibly injected between sedimentary strata, so as to arch the beds above while leaving those below relatively flat.
It is now known that the five major peaks of the Henry Mountains are not laccoliths but stocks.
However, these central magma bodies are the source material for branching offshoots that are true laccoliths, as Gilbert defined them (Figure 4.34).
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