70 million years ago, the days were about 30 minutes shorter, scientists claim. They came to this conclusion after researching the fossil of a shell, which was buried in the ground for millions of years.
Scientists came to this conclusion by observing the rings of the shell. Like today’s shells, this fossilized bone, which belongs to the extinct species, received one per day. This species became extinct 66 million years ago.
Rock analysis is one of the ways to study the length of the day in a certain geological epoch. Using this method, Belgian researchers were able to determine that 70 million years ago, days were shorter by half an hour.
Today, the day lasts 23 hours, 56 minutes and 4 seconds, but it is rounded to 24 hours.
The analysis of the shell also led to the conclusion that the temperature on the ground was higher at that time. The water in which this shell lived will reach as much as 40 degrees Celsius. Scientists also managed to determine the lifespan of this shell, which was 9 years.