Orbital cyclicity in a Turonian sequence of the Cotinguiba Formation, Sergipe Basin, NE Brazil

The Turonian sedimentary succession of the Cotinguiba Formation in the Sergipe Basin, northeastern Brazil, has a well-defined cyclicity, which is evident in two different facies: thinly laminated (mm-thick ) varve-like beds and limestone/marlstone couplets (1–50 cm thick). Both facies show periodic or quasi-periodic patterns associated with orbital-climatically driven Milankovitch cycles. Spectral analyses (Fast Fourier Transforms) were...