A new study reveals that the days 70 million years ago were half an hour shorter … Learn the details


A new study revealed strange details about the shape of the world millions of years ago, as the earth shifted faster at the end of the time of the dinosaurs than it was today, when it was rotating 372 times a year, compared to the current 365, according to a new study of fossil shells from the late Cretaceous period, and this It means that the day used to take only 23 and a half hours, instead of 24 hours as it is now according to the new study published in the Journal of the University of Palais in Paleokinography and ancient climatology.

A website report says “physOld mollusks, from a naturally diverse and extinct group known as clams, quickly developed daily episodes of growth … The new study used lasers to sample micro-slides from seashells and promise growth rings with greater accuracy than human researchers with microscopes.


The growth rings allowed researchers to determine the number of days in a year and accurately calculate the length of the day 70 million years ago, and the new measurement reaches examples of how the moon was formed and how close it is to the history of gravity, which lasted 4.5 billion years, and the new study also found evidence that mollusks contained On optical structures, coral reef construction may be fueled on the scale of modern coral reefs.

The high accuracy obtained in the new study, along with the rapid growth rate of the two ancient shells, revealed unprecedented details about how the animal lived and the water conditions in which it grew, reaching a small part of the day.

For his part, Nils de Winter, an analytical geochemist, said: “We have about four to five data points per day, and this is something you almost never get in geological history … We can basically look at a” day “70 million years ago, It’s very cool, “she says Vrije Universiteit Brussel And the main author of the new study.


Climate reconstructions in the deep past describe long-term changes occurring over a tens of thousands of years, and studies such as these give a glimpse into the change in the timeline of living organisms and have the potential to bridge the gap between climate and weather models.

The chemical analysis of chance indicates that the ocean temperatures were much warmer in the late Cretaceous period compared to the previous estimate, as it reached 40 degrees Celsius (104 degrees Fahrenheit) in the summer, and exceeds 30 degrees Celsius (86 degrees Fahrenheit) in winter, said de Winter. Summer high temperatures are likely to approach the physiological limits of mollusks.

Meanwhile, Peter Skelton, a retired lecturer in ancient biology at Open University – an expert not affiliated with the new study – “The high accuracy of this dataset allowed the authors to draw particularly important conclusions that help increase our understanding of both astronomy in astronomy in the times.” Modern stone and ancient biology. “

The new study analyzed one person who had lived for more than 9 years on the shallow seabed in the tropics, a site that, after 70 million years, had become dry land in the mountains of Oman, and the report says, “The ancient mollusks had two shells, or valves, that were met by hinges, such as Asymmetric oysters, grown in dense coral reefs, like modern oysters … have bloomed in water several degrees around the world warmer than modern oceans. “

In the late Cretaceous, astronomers believe such T. sanchezi It is possible to build coral reefs in tropical waters all over the world, to the “optimal” extent of the role coral reefs play today, who disappeared in the same event that killed non-bird dinosaurs 66 million years ago.

The new study focused on a laser on small parts of the cortex, which led to openings with a diameter of 10 ،m, or displayed like a red blood cell .. The trace elements in these small samples reveal information about the temperature and chemistry of water at the time the cortex is formed, and the analysis provided measurements Accurate presentation and number of daily growth episodes as well as seasonal patterns, and researchers used seasonal variations in the fossilized atmosphere to determine years.

The new study also found that the composition of the cortex has changed throughout the day more than the seasons, or with tidal cycles in the ocean, and the precise accuracy of the daily layers shows that the cortex grew faster during the day than the night, and de Winter said: “These two shells had a strong dependence This session is very daily, which indicates that it contains antibiotics … and you have a day and night rhythm of light that is recorded in a shell. “

This finding indicates that daylight was more important to the life of the old mollusk than was expected if it mainly fed itself by filtering food from water, such as modern oysters and shellfish, according to the authors, while de Winter said that mollusks probably had a relationship With symbiotic species inhabited by sunlight that feed on sunlight, similar to the living giant clams that harbor symbiotic algae.


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