Dinoflagellate biostratigraphy of Piripauan - Haumurian sections in southern Marlborough and northern Canterbury, New Zealand

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Roncaglia, L.; Schioler, P. 1997 Dinoflagellate biostratigraphy of Piripauan - Haumurian sections in southern Marlborough and northern Canterbury, New Zealand. Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 97/09 50 p.

Abstract: A palynological analysis of two sections in southern Marlborough and three sections in northern Canterbury, of Piripauan-Haumurian age, shows that: 1) in southern Marlborough the Okarahia Sandstone was deposited in a marginal marine nearshore environment, and the overlying Tarapuhi Grit, Conway Formation and Claverley Sandstone were deposited in open marine environments with considerable influx of terrestrial material; 2) in northern Canterbury the Broken River Formation is basically non-marine, with minor marine incursions indicated by the occurrence of low diversity dinoflagellate assemblages. The overlying Conway Formation was deposited in a marginal marine, nearshore environment. A qualitative analysis of the dinoflagellate assemblages shows that at Haumuri Bluff the Piripauan Okarahia Sandstone is of late Coniacian to early Santonian age, and is separated from the overlying early Haumurian (early to mid Campanian) Tarapuhi Grit by an unconformity encompassing the middle Santonian to early Campanian interval. The overlying Haumurian Conway Formation and Claverley Sandstone together span the Campanian interval. In northern Canterbury, the base of the Conway Formation is of middle to late Campanian age; the top of that formation and the base of the overlying late Haumurian Loburn Mudstone are of late Maastrichtian age. The following succession of dinoflagellate zones is recognised in the sections: Conosphaeridium abbreviatum Interval Zone (late Coniacian-early Santonian), Odontochitina porifera Interval Zone (early Santonian), Satyrodinium haumuriense Interval Zone (early to mid Campanian), Isabelidinium pellucidum Interval Zone (new-mid to late Campanian), Alterbidinium acutulum Interval Zone (late Campanian-early Maastrichtian) and Manumiella druggii Zone (late Maastrichtian). The S. haumuriense Interval Zone is subdivided into three new subzones: Trithyrodinium suspectum Interval Subzone, Vozzhennikova spinulosa Interval Subzone and Canninginopsis bretonica Interval Subzone. The A. acutulum Interval Zone is subdivided into two new subzones: Cerodinium diebelii Interval Subzone and Palaeocystodinium granulatum Interval Subzone. (auths)