Timing and amount of uplift of the youngest Holocene marine terrace along the Honeycomb Rock - Riversdale Beach coast, eastern Wairarapa

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Litchfield, N.J.; Cochran, U.A.; Berryman, K.R.; Ansell, B.; Clark, K.J. 2013 Timing and amount of uplift of the youngest Holocene marine terrace along the Honeycomb Rock - Riversdale Beach coast, eastern Wairarapa. Lower Hutt, N.Z.: GNS Science. GNS Science report 2013/54 44 p.

Abstract: This report provides estimates for the timing and amount of uplift of the youngest Holocene marine terrace in the Honeycomb Rock – Riversdale Beach area, eastern Wairarapa. Ages obtained in this study from shells on the shore platform of the youngest raised terrace are combined with previous ages from similar locations to determine the best estimate for time of uplift. We used OxCal analysis to provide modelled ages from each of three areas: Glenburn 665-621 cal. yr BP; Flat Point 729-657 cal. yr BP and Riversdale 655-557 cal. yr BP. If the Flat Point ages are considered to slightly predate the uplift event, then the best estimate for time of uplift is 635 ± 20 cal. yr BP. Surveying the height of the raised shore platform with respect to mean sea level suggests that the terrace was raised by approximately 1 metre along this stretch of coast. Two ages of 465-310 and 401-260 cal. yr BP were also obtained from a possible tsunami deposit near Honeycomb Rock. Comparison of all ages and elevations with those from other sites and discussion of uplift mechanisms will be undertaken in future studies. (auth)