Physics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43..629y&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 43, Issue 4, pp.629-635
Physics
3
Scientific paper
13 C and 18 O analyses have been performed on the aragonite shells of a variety of modern land snails from a number of different geographic and climatic locales. The 18 O values of the waters assumed to be in isotopic equilibrium with the shell carbonate were calculated. These calculated 18 O values are more positive than the 18 O values of the average meteoric waters in the locales in which the snails lived. The 18 O enrichment appears to be linearly related to the reciprocal of the local relative humidity, which is consistent with the notion that these ambient waters have undergone isotopic steady-state evaporation. Measurements of the 18 O values of ancient land snail shells from the excavation of Sudden Shelter (42SV6) at Ivie Creek, Utah, suggest that the climate at this site was probably warmer and/or drier around 7100-7800 BP than at present.
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