Fossil localities in Torlesse rocks of the North Island, New Zealand

Speden, I. G.

doi:10.1080/03036758.1976.10421467

Cited by 68 publications

(55 citation statements)

References 37 publications

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“…It occurs as massive shellbeds and as solitary specimens in the shallow-water Murihiku Supergroup (Campbell & Coombs 1966) in south-west Auckland and Southland. It has been found at three localities in Canterbury Suite rocks near Taneatua, Bay of Plenty (Fleming 1953;Speden 1976), North Isl'and, and also occurs in New Caledonia (Lillie & Brothers 1970). This is the first record of the taxon in the Canterbury Suite of the South Island.…”

Section: Preservation and Description Of The Speciesmentioning

confidence: 86%

Early Jurassic (Ururoan Stage)Pseudaucellafrom Canterbury Suite rocks at Kaiwara, North Canterbury

Speden¹

1979

New Zealand Journal of Geology and Geophysics

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Section: Preservation and Description Of The Speciesmentioning

confidence: 86%

Early Jurassic (Ururoan Stage)Pseudaucellafrom Canterbury Suite rocks at Kaiwara, North Canterbury

Speden¹

1979

New Zealand Journal of Geology and Geophysics

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“…1 (Campbell & Warren 1965), and have been interpreted by many workers as indicating a Permian terrane which extends into the study area (Gail' 1%7;Mutch 1963;Speden 1975). The Permian fossil locality closest to the study area which we regard as valid is S117/f523* ( Fig.…”

Section: Setting Within the Torlesse Terranementioning

confidence: 99%

Triassic rocks of the Black Forest-Haldon area, Mackenzie Country, South Island, New Zealand

Force¹,

Force²

1978

New Zealand Journal of Geology and Geophysics

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Tightly folded marine sedimentary rocks, most or all of Triassic age, form the low hills on the north-east shore of Lake Benmore. They are separated from foliated sandstone and phyllite above and to the east by the Black Forest Thrust, which dips gently eastward.The sedimentary sequence in rocks known to be Triassic is, from the base: large lenticular sandstone bodies separated by subordinate finer-grained rocks; smaller sandstone lenses enveloped by siltstone and by.Jhin alternations of sandstone and siltstone which are commonly graded; and homogeneous siltstone with a few graded sandstone beds. The first two associations make up the Haldon Formation; the last is the Spurs Siltstone, The Haldon Formation is interpreted as an accumulation of channel sands and interchannel deposits formed in the upper part of a submarine fan. The Spurs Siltstone was deposited after this portion of the fan became inactive.The Middle Triassic pterioid Daonella and other fossils were found in the uppermost Haldon Formation. The tube fossil Torlessia was found at two localities, one at about the same horizon as Daonella and one at a lower horizon.Sandstone and fine-grained turbidites forming two outlying hills are named the Mount Maggie Formation.Haldon and Spurs Formations (and probably Mt Maggie Formation) are deformed into two interfering sets of folds. The first set consists of basically east-striking and mostly east-facing tight, steeply plunging folds with limbs steeply inclined to the south. The second set consists of a shallowly plunging, north-trending, open anticline to the west and a north-trending, tight synclinal fold belt to the east which is probably also shallowly plunging. Siltstone in the latter contains fracture cleavage and is locally overturned under the Black Forest Thrust. GEOLOGIC SETTINGThe Mackenzie Plain is an intermontane basin partially filled with the outwash and moraine of extensive Pleistocene glaciers. It is a dry area with thin soil and few trees. The land is divided mostly into large sheepruns established as early as the 1860s.The study area consists of roughly 38 krn" at the southern end of the Mackenzie Plain and just east of Lake Benmore (Fig. 1), lying wholly within Black Forest and Haldon stations and including both homesteads (Fig. 2). Isolated bedrock hills to the north poke up through the Pleistocene outwash and give way to more continuous rugged topography to the south. Elevations range from 360m (1183ft) to 960m 0158ft). The hills are tussock-covered and have slopes generally of 30°Or less. Rough tracks extend up most of the larger gullies and a private road follows Black Forest Stream. We saw no' 'evidence that the study area itself has been glaciated. Exposure is adequate for tracing beds on ridges and north-facing slopes if information is also gleaned from float. Exposure on south-facing slopes is mostly poor, and bedrock in most valleys is covered by alluvium. There are few natural exposures suitable for detailed measured sections.We found that the physiography is controlled by...

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“…Speden (1976), in a recent comprehensive account of fossil localities in Torlesse rocks (generafly referred to as Torlesse Supergroup that includes the Ruahine Greywacke Group), mentions that "invertebrate fossil localities are known over a large area from near Lake Waikaremoana (N96) to the south end of the Ruahine Range (N140)". Speden (1976, fig. 1 Stevens 1963).…”

Section: Localitymentioning

confidence: 99%