Chinamans Hat Island

Chinamans Hat Island is an islet located off the south coast of Yorke Peninsula in Investigator Strait in South Australia about 2.4km south-west of Stenhouse Bay and within 350m of the shore. As of 2014, it is located within the Innes National Park.DescriptionChinamans Hat Island is located about 350m from the shoreline and about 2.4km south-west of Stenhouse Bay. The islet is a remnant piece of cliff line which rises to a height of 11m and sits on an intertidal rock platform that joins the mainland at the west and extends past the island to the east. The islet is named due to the similarity of its shape to a conical Asian hat. Access is reported as being ‘best gained by small boat, taking care to avoid the shallow rocks and reefs in the surrounding waters.’ The name ‘Chinamans Hat’ is also informally used for other features near the islet such as the small bay located between it and the mainland, the intertidal reef that connects it to the mainland and facilities on the mainland provided as part of the Innes National Park.Formation, geology and oceanographyChinamans Hat Island was formed between 7500 and 8900 years ago after sea levels rose at the start of the Holocene thereby separating Yorke Peninsula from Kangaroo Island. Chinamans Hat Island is reported as being entirely composed of a Bridgewater Formation calcarenite rock with ‘distinct horizontal layers of hard calcrete’. The islet rises from a depth of 10m.