Slowdown of Earth's spin caused an oxygen surge

My observation. The reference paper indicates Earth's LOD was 21 hours 2 billion years ago. Spinning at the equator then about 0.53 km/s. Other reports using strata indicate a shorter day and faster spin rate too at 1.4 billion years ago. 18 hour day with the Moon orbiting about 340,900 km away, thus a lunar period < 23 days. Thank the moon for Earth's lengthening day,

My note. The Moon about 340,900 km distance from Earth 1.4 billion years ago indicates a lunar orbit < 23 days and distance in earth radii about 53.4 earth radii compared to the lunar mean near 60.3 earth radii distance today. Such changes to Earth's LOD and lunar orbit need to be verified accurately to be accepted as a factual measure of long age or deep time. The NASA ADS Abstract is Proterozoic Milankovitch cycles and the history of the solar system,, May 2018.

The new article posted here indicates a 21 hour LOD for Earth 2 billion years ago vs. 18 hour day 1.4 billion years ago with a much shorter lunar month too. Some tweaks may still be needed as well as validating the geologic strata for the needed cycles and changes to show evidence for the shorter day and shorter lunar month.
Something to round out the report here on Earth's length-of-day or LOD in the Precambrian. 2 billion years ago, the Sun was spinning perhaps with a 15 day period. If we dig more into the Precambrian, the Faint Young Sun problem shows up. The Faint Young Sun Paradox shows the Sun is spinning with a 15 day period some 2 or 2.5 billion years ago. The solar rotation rate at the Sun's equator is then about 3.374 km/s compared to about 2 km/s today (about 25 day rotation period at the solar equator). Reference, Young Sun, galactic processes, and origin of life,

So, much evolutionary changes are required in the Earth-Moon system (Earth's LOD, lunar orbit and period) and Sun (energy output and rotation speed) going back to the Precambrian based upon ages accepted today as secure in science.