The majority of fossil organisms, however, did not match with modern groups; this led to the classification of three major eras within the period of time when the Earth's surface was populated with advanced life forms.
These eras were referred to as the Paleozoic (meaning ancient life), the Mesozoic (meaning middle life), and the Cenozoic (meaning recent life) based on their relative similarity with modern taxa.
Scientists gain an understanding of the Earth's history by studying its composition.
Geological processes have helped to create many iconic features on Earth.
By 1830 Lyell's famous textbook, Principles of Geology, came out. Such was the age of the great creationist geologists!
The principle of faunal succession in the geologic record was established by direct observation as early as 1799 by William Smith.
The Ordovician Period is the second of the six (seven in North America) periods of the Paleozoic Era.
The Ordovician follows the Cambrian Period and is followed by the Silurian Period.
The Ordovician is usually broken into Lower (Tremadoc and Arenig), Middle (Caradoc, Llanvirn, Llandeilo) and Upper (Ashgill) subdivisions. With a half-life of only 5730 years, carbon-14 dating has nothing to do with dating the geological ages! Hovind is confusing the carbon-14 "clock" with other radiometric "clocks." The only thing in the geologic record which has anything to do with calibrating carbon-14 dating is the coal from the Carboniferous Period.Being ancient, the C-14 content has long since decayed away and that makes it useful in "zeroing" laboratory instruments. Hovind would take the trouble to do a little reading from something other than creationist publications he would not make such an outrageous statement.Online exhibits Geologic time scale Take a journey back through the history of the Earth jump to a specific time period using the time scale below and examine ancient life, climates, and geography.You might wish to start in the Cenozoic Era (65.5 million years ago to the present) and work back through time, or start with Hadean time (4.6 to 4 billion years ago)* and journey forward to the present day it's your choice.