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Abstract. This work presents ShellChron, a new model for generating accurate internalage models for high-resolution paleoclimate archives, such as corals,mollusk shells, and speleothems. Reliable sub-annual age models form thebackbone of high-resolution paleoclimate studies. In the absence of independentsub-annual growth markers in many of these archives, the most reliablemethod for determining the age of samples is through age modeling based onstable oxygen isotope or other seasonally controlled proxy records.ShellChron expands on previous solutions to the age model problem by fittinga combination of a growth rate and temperature sinusoid to model seasonalvariability in the proxy record in a sliding window approach. This newapproach creates smoother, more precise age–distance relationships formulti-annual proxy records with the added benefit of allowing assessment ofthe uncertainty in the modeled age. The modular script of ShellChron allowsthe model to be tailored to specific archives, without being limited tooxygen isotope proxy records or carbonate archives, with high flexibility inassigning the relationship between the input proxy and the seasonal cycle.The performance of ShellChron in terms of accuracy and computation time istested on a set of virtual seasonality records and real coral, mollusk, andspeleothem archives. The result shows that several key improvements incomparison to previous age model routines enhance the accuracy of ShellChronon multi-annual records while limiting its processing time. The current fullworking version of ShellChron enables the user to model the age of 10-year-long high-resolution (16 samples yr−1) carbonate records with monthly accuracywithin 1 h of computation time on a personal computer. The model isfreely accessible on the CRAN database and GitHub. Members of the communityare invited to contribute by adapting the model code to suit their researchtopics and encouraged to cite the original work of Judd et al. (2018)alongside this work when using ShellChron in future studies.

ShellChron 0.4.0: a new tool for constructing chronologies in accretionary carbonate archives from stable oxygen isotope profiles