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Summary: M. Toubin, C. Dumont, E. P. Verrechia, O. Lalligant, A. Diou, F. Truchetet, and M. A. Abidi, "A Multi-scale Analysis of shell growth increments using
wavelet transform," Computers & Geosciences, Journal of the International Association for Mathematical Geology, Vol. 25, pp. 877-885, September 1999.93
tation rate: the eects of environmental factors
(Rosenberg, 1975), i.e. temperature, photoperiods and
tides, and the chemical composition of environmental
Żuids (Wada and Fujinuki, 1976). For example, in
Anadonta cygneae (L.), the thicker ridges are related to
winter growth. There are no more than ten of these
thick layers, indicating a life expectancy of 10 years for
this type of mollusk. In conclusion, two types of infor-
mation are provided by the shell structure: (1) internal
factors (i.e. growth rates and time periodicity) and (2)
external factors (i.e. variations in the biogeochemical
conditions of environments). The search for these two
types of information inside accretionary shells of living
or fossil organisms is critical for geologists who try to
characterize the changes in the earth and organisms
through time.
Previous studies of growth increments (Rhoads and
Pannella, 1970) used thin sections of shell and acetate
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