Age
Geologists employ biostratigraphy, the use of index fossils, for dating sedimentary rock units like the Coon Creek. Index fossils are species of plants or animals that existed over a wide area for a geologically short period of time (Russell and Parks 1975). The cephalopod Jeletzkytes nodosus is a time-sensitive fossil found in rocks a little younger than 70.6 million years old in the western United States. Other index fossils from Coon Creek date a little older than 70.6 million years. The overlap indicates that Coon Creek sediments were probably deposited between 70 and 71 million years ago.
Read more about this topic: Coon Creek Formation
Famous quotes containing the word age:
“In every age the vilest specimens of human nature are to be found among demagogues.”
—Thomas Babington Macaulay (1800–1859)
“He to whom the present is the only thing that is present, knows nothing of the age in which he lives.”
—Oscar Wilde (1854–1900)
“If youth but knew; if age but could.
Wives in their husbands’ absences grow subtler,
And daughters sometimes run off with the butler.”
—George Gordon Noel Byron (1788–1824)