Abstract
Abstract In middle and late Permian time, the Productus Creek area of South land, New Zealand, was the site of simultaneous accumulation of shallow marine, biogenic carbonate and immature volcanogenic sediments. The prismatic shell fragments of the bivalve Atomodesma formed the major limestones; this suggests a well-established bank environment. Less extensive calcareous Bryozoa banks succeeded the Atomodesma banks, and were covered in turn by a prograding conglomerate in late Permian time. Trends in fossil assemblages, clay mineralogy, sediment sizes, and sediment thicknesses suggest a nearby Permian shore line north-west of Productus Creek. Two hypothetical transgression-regression models of the Productus Creek Group are discussed: (a) a migrating delta and (b) eustatic sea-level variation which takes into account contemporaneous glacial events in Australia and elsewhere. One new informal formation, the Weetwood Formation, is named, and the Mangarewa, Elsdun, and Hawtel Formations are redefined.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.