F. Chiesi et al., VARIATIONS IN SYNODIC CYCLE DURATION RECO RDED BY PECTINID SHELLS OVER THE LAST 200-MILLION YEARS, Comptes rendus de l'Academie des sciences. Serie II. Sciences de la terre et des planetes, 321(5), 1995, pp. 353-359
The number of days per synodic cycle was estimated from growth rhythms
of Bivalve shells belonging to the family Pectinidae over the last 20
0 million years. Large variations are documented. Their linking to pla
te tectonic activity and to the development of the Quaternary glaciati
on is discussed. The possibility of a relation with change in Earth's
rotation raises problems of interpretation.