Spectrogram analysis of seven natural gamma-ray logging of Member 1 of the Qingshankou Formation (K2qn(1)) and Member 1 and 2 of the Nenjiang Formation (K(2)n(1-2)) of Late Cretaceous age in the Songliao Basin reveals sedimentary cyclicities controlled by Milankovitch climate periodicities. The recognition of Milankovitch cycles allows estimation of an average accumulation rate of similar to 7.55-8.62 cm/ka for the K(2)qn(1) sections, and similar to 6.69-10.16 cm/ka for the K(2)n(1-2) sections. Two marine transgression events occurred during the deposition of K(2)qn(1) and K(2)n(1-2) and their ages are at similar to 0.74-1.10 Ma and similar to 2.38-4.84 Ma, respectively. Identification of Milankovitch cycles from fine-grained deep lake sedimentary rocks in the Songliao, Basin may provide great potential for high-resolution stratigraphic subdivisions and correlations.
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