Abstract: Three independently measured variables (magnetic susceptibility, photoelectric factor and total gamma-ray) obtained from throughout the type Kimmeridge Clay Fm in Dorset (Southern England) were used to identify regular metre-scale, sedimentary cycles. Spectral analysis demonstrates that for long stratigraphical intervals the cycles are expressed as large-amplitude cycles of 1.87–4.05 m wavelength and smaller-amplitude cycles of around half that wavelength. These cycles are interpreted to record orbital obliquity and precession, respectively. The much larger amplitude of the inferred obliquity cycles compared with the precession cycles may indicate a high-latitude climatic forcing transferred to lower latitudes via sea-level variations. Orbital tuning indicates that the Early Kimmeridgian (sensu anglico) lasted at least 3.6 Ma (95 longer-wavelength cycles) and the Late Kimmeridgian at least 3.9 Ma (103 longer-wavelength cycles). The first detailed productivity estimates for the Kimmeridge Clay Fm, on a cycle-by-cycle calculation, indicate that average productivity of the type Kimmeridge Clay (220 g m−2 a−1) was less than the average productivity on modern continental shelves. The high average organic carbon content of the type Kimmeridge Clay (3.8% total organic carbon) cannot be attributed to high average productivity. However, the average organic carbon content is consistent with low siliciclastic mineral dilution of organic matter and/or elevated preservation linked to reduced bottom-water oxygenation.
Space Aliens driving Space SUVs.............
Interesting story SC. It is a fact that when objects orbit other masses, the orbit slows down over time. In the formula, mass is constant, so velocity changes. In the case of earth, the wobble changes angles as the orbit slows. So the revolution of the earth lessens slightly over time as it slows down, which means the year is getting shorter. We see differences in magnetic forces that are associated with these fluctuations, and in fact, Magnetic shifts are visible in the rock record. It has occurred a few times and is responsible for some of the Climate changes that are noted. However, the Earth has been in a constant state of Climate Change for 4.8 billion years, depending on who you talk to.