Youngest:

Medium-grained basic dikes with biotite as an important mineral. This is similar to the dike rocks in the Brown Hills in composition and in that it cuts the Ferrar Dolerite formation.

"Railway line porphyry" - of probable composite origin where dark porphyritic bands, 4-5 feet in width border an internal 6 foot leucocratic band. The contact between the two types is sharp with possible baking of the outer portion by a later leucocratic middle.

Fine grained schistose to non schistose lamprophyre.

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Fine grained leucocratic pegmatite.

Aplite.

"Bonney Porphyry" - porphyry with uncommon phenocrysts and a dark fine grained groundmass.

"Vida Granite" - medium grained homogeneous rook with pink orthoclases.

"Varda Porphyry" - grey coarser grained groundmass with mafic blebs and larger phenocrysts.