- journal_title：Geology
- Contributor：K. B. Spörli ; Y. Aita ; G. W. Gibson
- Publisher：Geological Society of America
- Date：1989-
- Format：text/html
- Language：en
- Identifier：10.1130/0091-7613(1989)017<0753:JOTANT>2.3.CO;2
- journal_abbrev：Geology
- issn：0091-7613
- volume：17
- issue：8
- firstpage：753
Red cherts from Kawakawa Bay near Auckland have yielded Late Triassic and Early Jurassic radiolarians. The cherts occur as blocks in melanges that have a green argillite matrix containing Middle and Late Jurassic (Callovian-Oxfordian) radiolarians. The melanges mark fault zones along which the Waipapa terrane has been imbricated. Callovian-Oxfordian green argillites are also found in stratigraphic contact with overlying Kimmeridgian-Tithonian green argillites and gray terrigenous clastics. The Late Triassic and Early Jurassic radiolaria are Tethyan, but the Middle and Late Jurassic faunas are dominantly non-Tethyan because the two sets of faunas are of low-latitude and of high-latitude origin, respectively, or because they originated in areas of differing ocean productivity. Occurrence of both Late Triassic and Early Jurassic radiolarians in one red chert horizon indicates sedimentary reworking.