Channell, J. E. T., Erba, E., Nakanishi, M. and Tamaki, K. (1995) Late Jurassic-Early Cretaceous time scales and oceanic magnetic anomaly block models. In: Geochronology, time scales and global stratigraphic correlation. , ed. by Berggren, William A.. SEPM Special Publications, 54 . SEPM , Tulsa, Oklahoma, USA, pp. 51-63. ISBN 1-56576-024-7

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Abstract

Comparison of oceanic anomaly block models in the MO-M29 interval from the Japanese, Phoenix, Hawaiian and Keathley lineations indicates that the Hawaiian block model represents the closest approximation to a constant spreading rate record. The new Hawaiian block model differs slightly from that of Larson and Hilde(1975). Currently popular numerical age estimates for polarity chrons, base CMO(121 Ma), CMI6-CM15(137 Ma) and top CM25(154 Ma), are consistent with constant spreading rate in the new Hawaiian block model but inconsistent with constant spreading in the Larson and Hilde (1975) block model. A new time scale (CENT94) is based on the above ages and constant spreading in the new Hawaiian block model. Land section , magnetostratigraphy, mainly from Italy and Spain, has provided direct correlations of polarity chrons to stage boundaries through
ammonite biozones, and indirect correlation through nannofossil and calpionellid biozonations : Barremian-Aptian (base of CMO), HauterivianBarremian(upper part of CM4 ), Valanginian-Hauterivian (base of CM 11 n), Berriasian-Valanginian (CM I Sn), Tithonian-Berriasian (base of CM l 8), Kimmeridgian-Tithonian (CM22A) and Oxfordian-Kimmeridgian (top CM25). These correlations yield the following stage boundary ages using CENT94: Barremian-Aptian ( I 2 I Ma), Hauterivian-Barremian (1 26 Ma), Valanginian-Hauterivian (13 l .5 Ma), Berriasian-Valanginian ( I 35.8 Ma),
Tithonian-Berriasian (141.6 Ma), Kimmeridgian-Tithonian (150 Ma), and OxJordian-Kimmeridgian (154 Ma).

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