Ordovician

The Ordovician period is a theorized second period in the theorized Paleozoic era. It is posited that it started approximately 500 million years ago after the end of the theorized Cambrian era. Most of the phyla which are living today is posited to have existed at the beginning of the Ordovician period by those who assert that the earth is billions of years old. Evolutionary scientists assert by the end of the Ordovician period, the first land plants, bryophytes, evolved and began to colonize the land. The Ordovician also is claimed to have seen the evolution of fish. The Ordovician is posited to have preceded by the Cambrian era and succeeded by the Silurian era.

Young earth creation scientists view

Young earth creationist scientists believe that the evolutionary geological timescale is in error. These scientists believe that the earth is young and has multiple lines of evidence from the field of geology showing that the earth is young. Also, young earth creationist scientists assert that there is an abundance of scientific arguments in addition to geology showing the earth and universe are both approximately 6,000 years in age. In addition, young earth creationist scientists have a number of arguments against the position of an extremely old age for the earth and the universe. Flood geologists also point out that catastrophism is increasingly being accepted in the field of geology. In addition, creationists also assert that old earth uniformitarian geology has numerous anomalies. For example, creationists cite the work of William R. Corliss who catalogued numerous anomalies in the old earth uniformatarian geology paradigm. Corliss wrote regarding paraconformities the following:

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"Potentially more important to geological thinking are those unconformities that signal large chunks of geological history are missing, even though the strata on either side of the unconformity are perfectly parallel and show no evidence of erosion. Did millions of years fly by with no discernible effect? A possible though controversial inference is that our geological clocks and stratigraphic concepts need working on." William R. Corliss, Unknown Earth (Glen Arm, Maryland: The Sourcebook Project, 1980), p. 219.

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The secular science journal New Scientist wrote regarding Corliss's work the following: "All I can say to Corliss is carry on cataloging." Young earth creationist scientists assert that paraconformaties pose a serious challenge to the old earth uniformitarian geology paradigm.