Depositional environment of the early Pleistocene Castlepoint Formation, New Zealand: a canyon fill in situ

Buckeridge, J, Beu, A and Gordon, D 2018, 'Depositional environment of the early Pleistocene Castlepoint Formation, New Zealand: a canyon fill in situ', New Zealand Journal of Geology and Geophysics, vol. 61, no. 4, pp. 524-542.


Document type: Journal Article
Collection: Journal Articles

Title Depositional environment of the early Pleistocene Castlepoint Formation, New Zealand: a canyon fill in situ
Author(s) Buckeridge, J
Beu, A
Gordon, D
Year 2018
Journal name New Zealand Journal of Geology and Geophysics
Volume number 61
Issue number 4
Start page 524
End page 542
Total pages 19
Publisher Taylor and Francis Asia Pacific
Abstract The early Pleistocene (early Nukumaruan) Castlepoint Formation cropping out on the Wairarapa coast contains a diverse molluscan, bryozoan and barnacle assemblage, with a few brachiopods, corals, echinoids, crabs and polychaetes, comprising mixed warm- and cool-water taxa and outer shelf and shallow-water taxa. Sedimentary structures within the beds (fluid release structures, steep original dips, large load casts, displaced blocks) confirm a dynamic depositional setting by gravity sliding into what is interpreted as a canyon head. The barnacle- and bryozoan-rich molluscan coquina (barnamol and bryomol) that makes up much of the Castlepoint Formation comprises thanatocoenoses resulting from transportation of shallow-water elements, which accumulated deeper-water taxa in transit, to settle in a shelf-edge canyon environment. We interpret all stratigraphic contacts as sedimentary ones; the formation is essentially a canyon fill in situ.
Subject Basin Analysis
Palaeoecology
Keyword(s) Barnacle coquina
barnamol
bryomol
canyon-head setting
Castlepoint
mixed shallow- and deep-water thanatocoenoses
DOI - identifier 10.1080/00288306.2018.1516227
Copyright notice © 2018 The Royal Society of New Zealand
ISSN 0028-8306
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