A Timescale is a scale used to represent periods of time. Option ... index fossils and see if we can figure out the order they would fall on the geologic timescale. Make a timeline for each group and ...

“Each of the rocks is associated with a time period,” explains Paul. To give you a sense of the length of geological time as you journey through, we’ve created our Evolution Timeline so that the ...

The geological time scale ... The scale functions as a massive calendar, dividing the history of life into eras, periods, and epochs based on fossil evidence. In this feature, explore the history ...

The Cretaceous is a geological period that began 145 million years ago and ended 66 million years ago. It is the last period in the Mesozoic Era. It comes after the Jurassic Period and before the ...

A successor to A Geologic Time Scale 1989 (Cambridge ... Toward a 'natural' Precambrian time scale W. Bleeker 11. The Cambrian period J. H. Shergold and R. A. Cooper 12. The Ordovician period R. A.