Well‐preserved palynomorphs (spores, pollen, and dinoflagellate cysts) found in a non‐calcareous grey siltstone block from The Sisters, a small group of islets 20 km north of Cape Pattison, Chatham Island, indicate a probable Ngaterian—Arowhanan (Cenomanian—early Turonian) age. The siltstone represents a deeper‐water facies of the Tupuangi and Rauceby Sandstones (Waihere Bay Group) of Pitt Island over 80 km to the south.
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Mildenhall et al. (1976) studied this question.
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