We still don't have a full understanding of the evolution of the Earth-moon system.
in western Australia, some gorges cut through 2.5 billion year old, rhythmically layered sediments. These sediments are banded iron formations, comprising distinctive once widely deposited on the ocean floor and now found on the oldest parts of the Earth’s crust. show how layers of reddish-brown iron formation just under a meter thick are alternated, at regular intervals, by darker, thinner horizons.
The Joffre Gorge in Karijini National Park in western Australia, showing regular alternations between reddish-brown, harder rock and a softer, clay-rich rock at an average thickness of 85 cm. These alternations are attributed to past climate changes induced by variations in the eccentricity of the Earth's orbit.
The darker intervals are composed of a softer type of rock which is more susceptible to erosion. A closer look at the outcrops reveals the presence of an additionally regular, smaller-scale variation. Rock surfaces, which have been polished by seasonal river water running through the gorge, uncover a pattern of alternating white, reddish and blueish-grey layers.
visible in these ancient rock layers. He suggested that the patterns might be related to past variations in climate induced by the so-called"Milankovitch cycles."The Milankovitch cycles describe how small, periodic changes in the shape of the Earth's orbit and the orientation of its axisRight now, the dominant Milankovitch cycles change every 400,000 years, 100,000 years, 41,000 years and 21,000 years.
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