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The stepped reckoner or Leibniz calculator was a mechanical calculator invented ... was used in many calculating machines for 200 years, ... multiply two 8-digit ...
For example, 201.4 ± 0.2 Ma, the lower boundary of the Jurassic Period, is defined as 201,400,000 years old with an uncertainty of 200,000 years. Other SI prefix units commonly used by geologists are Ga (gigaannum, billion years), and ka (kiloannum, thousand years), with the latter often represented in calibrated units ( before present ).
Megamonodontium mccluskyi (Mygalomorphae: Barychelidae) is an extinct species of spider from the Miocene (16–11 million years ago). [1] [2] [3] Its fossil was discovered in June 2020 in New South Wales, Australia, at McGraths Flat fossil site, by Dr Simon McClusky. [4] [5] It is the first fossil of the Barychelidae family ever found. [6]
The table starts counting approximately 10,000 years before present, or around 8,000 BC, during the middle Greenlandian, about 1,700 years after the end of the Younger Dryas and 1,800 years before the 8.2-kiloyear event. From the beginning of the early modern period until the 20th century, world population has been characterized by a rapid growth.
A nearly complete and intact dinosaur skeleton has been excavated in France. The specimen is a Titanosaur, one of the largest dinosaurs of its time.
Millions_of_years_ago can take a number (don't include commas, which are added automatically), or a period name (e.g. Cambrian), in which case it will return the date the period started. Suffix is optional and defaults to "million years ago".
What is probably the world's oldest ice, dating back 1.2m years ago, has been dug out from deep within Antarctica. Million year-old bubbles could solve ice age mystery Skip to main content
Madison was under the impression he had a piece of Baltic amber that was between 40 and 50 million years old with a tarantula trapped inside that he could get up to $50,000 for.