Jurassic sediments at Chaslands mistake.
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Chaslands Mistake is a prominent headland lying on the south-east Otago coast, within N.Z.M. sheets S183 and S184. Access is from the Balclutha-Invercargill coast road, via the Cathedral Caves track and Waipati Beach. Approximately one hour is required from the road to the Chasland's Headland; the Waipati Estuary can only be forded at half to low tide levels.
The only previous detailed geological work done at Chaslands Mistake is that by Speden (1971 ), described in "Geology of the Papatowai Subdivision", Geological Survey Bulletin 81, which covers the northern side of the headland.
This report presents the results of a (somewhat) more detailed investigation into the geology of Chaslands Mistake, with particular emphasis on the sedimentary geology. The sediments in the coastal section are described. using the (now well established) technique of facies analysis (e.go Reading, 1970; Selley, 1970). The spatial distribution of facies associations is indicated on a map of Chaslands Mistake and facies relationships in a vertical sequence shown on Section A.
The geography of the headland is dominated by high coastal cliffs along the southern coast. Away from the coast the land is covered by thick bush which makes detailed sedimentary work impractical on anything other than the coastal exposures.
The map of Chaslands Mistake was drawn from 1 inch : 60 chain topographic mapping sheets obtained from the Lands and Survey Department. Detail was added from air-photos N.Z.M.S. Runs 15 95/39-41. Topographic heights have been transformed to metric units. Various localities have been informally named(i.e. South Bay), and location numbers (i.e. hoc 1) added for ease of reference.
Early maps of the Catlins area depict the Jurassic sedimentary rocks in biostratigraphic terms. This approach was also used in the New Zealand Surveys 1:250 000 Geological Map of New Zealand. The first worker to attempt a formational subdivision of Cat1ins geology was Speden (1971), whose comprehensive bulletin provides a lithostratigraphic framework for the rocks of the district. The Chaslands Mistake area falls at the extreme southwest of the area mapped by Speden, only partly lying within his map boundaries. Chaslands Mistake lies on the southern limb of the Fortification Syncline, one of several parasitic fold.s mapped by Speden on the "south limb" of the regional Southland Syncline.
The only previous detailed geological work done at Chaslands Mistake is that by Speden (1971 ), described in "Geology of the Papatowai Subdivision", Geological Survey Bulletin 81, which covers the northern side of the headland.
This report presents the results of a (somewhat) more detailed investigation into the geology of Chaslands Mistake, with particular emphasis on the sedimentary geology. The sediments in the coastal section are described. using the (now well established) technique of facies analysis (e.go Reading, 1970; Selley, 1970). The spatial distribution of facies associations is indicated on a map of Chaslands Mistake and facies relationships in a vertical sequence shown on Section A.
The geography of the headland is dominated by high coastal cliffs along the southern coast. Away from the coast the land is covered by thick bush which makes detailed sedimentary work impractical on anything other than the coastal exposures.
The map of Chaslands Mistake was drawn from 1 inch : 60 chain topographic mapping sheets obtained from the Lands and Survey Department. Detail was added from air-photos N.Z.M.S. Runs 15 95/39-41. Topographic heights have been transformed to metric units. Various localities have been informally named(i.e. South Bay), and location numbers (i.e. hoc 1) added for ease of reference.
Early maps of the Catlins area depict the Jurassic sedimentary rocks in biostratigraphic terms. This approach was also used in the New Zealand Surveys 1:250 000 Geological Map of New Zealand. The first worker to attempt a formational subdivision of Cat1ins geology was Speden (1971), whose comprehensive bulletin provides a lithostratigraphic framework for the rocks of the district. The Chaslands Mistake area falls at the extreme southwest of the area mapped by Speden, only partly lying within his map boundaries. Chaslands Mistake lies on the southern limb of the Fortification Syncline, one of several parasitic fold.s mapped by Speden on the "south limb" of the regional Southland Syncline.
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84 leaves : illus., maps in pocket ; 30 cm.
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1976Geary
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POLYGON ((169.324672369190665 -46.640010217113463,169.328263145141506 -46.617621825305292,169.379499629133051 -46.618899676620167,169.377482405908495 -46.641339504291388,169.324672369190665 -46.640010217113463))
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Geary, Geoffrey Clive., “Jurassic sediments at Chaslands mistake.,” Otago Geology Theses, accessed October 4, 2024, https://theses.otagogeology.org.nz/items/show/92.