Astronomically controlled cycles in the lower Tertiary of Gubbio (Italy)

Details Astronomically controlled cycles in the lower Tertiary of Gubbio (Italy) Astronomically controlled cycles in the lower Tertiary of Gubbio (Italy)

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..84...22s&link_type=abstract

Earth and Planetary Science Letters, Volume 84, Issue 1, p. 22-26.

Computer Science

1

Scientific paper

A grouping of marl limestone beds in the Tertiary of Gubbio is interpreted in terms of sedimentary cycles. Two methods of recording are used: subjective mapping of cycle boundaries in the field and power spectral analysis of bed thickness measurements. Both result in cycle thicknesses of between 30 and 70 cm.
The cycle record is compared with the known magnetic stratigraphy and this gives an absolute time estimate of 100 kyr for the cycle. It therefore seems likely that the earth's eccentricity period is the ultimate cause of the cycle.

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