Debate About the Earliest Calendar
Paragraph 1：Some researchers believe that we can trace the written calendar back more than 20,000 years to the last ice age. In particular, Alexander Marshack has interpreted cut marks found on bits of bone from central Africa and Paleolithic caves in France to be rudimentary forms of an early lunar calendar. The evidence lies in distinct clusters of cut marks on the bones — marks that could not have been by chance. The marks must have been made by using a sharp cutting tool or by twisting a pointed object to form a hole in the surface of the bones. According to Marshack, each mark represents a day and these marks are grouped in patterns of 14 or 15 days. This interval would correspond to the times between the first sighting of a crescent moon and the full moon, and the interval between a full moon and the beginning a new moon cycle.
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