georefid:1997-054549SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=1997-0545491997-01-01publicationgeorefid:1997-054549Edwards, Anthony R.New Zealand Geological Survey, Lower Hutt, New ZealandauthorCambridge University Press, Cambridge, United KingdompublisherdocumentHardcopyIn: Van Couvering, John A. (editor), The Pleistocene boundary and the beginning of the Quaternary9273-277Since 1953 the Pliocene-Pleistocene boundary in New Zealand has been set at the base of the Nukumaruan (regional) Stage because that coincides with the abrupt first appearance of the subantarctic bivalve Chlamys delicatula (Hutton) in marine sequences of central New Zealand. However, it is now estimated, on the basis of biostratigraphic, magnetostratigraphic, and radiometric data, that the Nukumaruan commenced at about 2.4 Ma and ended about 1.3 Ma and that the Olduvai subchron approximately coincides with the middle of the Nukumaruan. In the stratotype Nukumaruan, and in correlative sections, a marked lithologic change (interpreted as the result of glacio-eustatic regression) following the first appearance of Gephyrocapsa sinuosa Hay and Beaudry may be correlative with the top of the Olduvai and with the Vrica boundary-stratotype.completedQuaternary geologyalgaeAustralasiabiostratigraphybiozonesBivalviaCenozoiccorrelationDeep Sea Drilling ProjectDSDP Site 284first occurrenceForaminiferaIGCPInvertebrataLeg 29marine environmentmicrofossilsMolluscanannofossilsNeogeneNew ZealandNorth IslandPacific OceanPlantaePleistocenePlioceneProtistaQuaternarystratigraphic boundaryterrestrial environmentTertiarythallophytesWanganui Basinurn:org.iodp:exp:29urnlargerWorkCitationcampaignurn:org.iodp:exp:29:site:284urnlargerWorkCitationstudyurn:org.iodp:exp:29urnlargerWorkCitationcampaignEnglishgeoscientificInformation166.0000178.0000-43.0000-38.0000IGCP Project No. 41