Tertiary

The Tertiary is a geological era that began following the extinction of the dinosaurs 66 million years ago and continued until the first ice age began 2.6 million years ago. It is preceded by the Cretaceous and followed by the Quaternary.

The name Tertiary was introduced by Italian geologist Giovanni Arduino in 1760. Arduino designated igneous and metaphoric rock as Primary, shales and limestones as Secondary, and fossil-filled sediment as Tertiary. The Primary layer was later renamed the Paleozoic (old life) in line with Darwinist assumptions. Arduino's Secondary level is now referred to as the Mesozoic (middle life). As a remnant of pre-Darwinist geology, the Tertiary has provoked opposition in recent years from the International Commission on Stratigraphy and others. However, the U.S. Geological Society continues to recognize the period.^[1]

References

â Division of Geologic Time -- Major Chronostratigraphic and Geochronological Units, USGS, 2010. "Although the Tertiary is not recognized by many international time scales, the GNC agrees that it is important that it be recognized as a system/period; the map symbols âTâ (Tertiary) and âQâ (Quaternary) have been used on geologic maps for more than a century and are widely used today."

[1] â Division of Geologic Time -- Major Chronostratigraphic and Geochronological Units, USGS, 2010. "Although the Tertiary is not recognized by many international time scales, the GNC agrees that it is important that it be recognized as a system/period; the map symbols âTâ (Tertiary) and âQâ (Quaternary) have been used on geologic maps for more than a century and are widely used today."

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