Abstract
ABSTRACT Age determinations by the C14 method have been made on the matrix and enclosed fauna of a Quaternary calcareous concretion from the shelf southeast of Cape Campbell, New Zealand. The results show that the concretion must have formed within 19,500 years, and probably within 7500 years. It appears to have grown in a calcareo-argillaceous sediment containing an abundant molluscan fauna. The classification of concretions, and the terminology applied to them, are discussed in this paper. The three categories recognised by Richardson (1921) are retained, but it is suggested that the terms contemporaneous, penecontemporaneous, and subsequent should be replaced by syngenetic, diagenetic, and epigenetic. The Cape Campbell concretion is considered to be diagenetic. C14 determinations on other Quaternary concretions should throw further light on the absolute rate of concretion-forming processes.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
