Dating methods geochronology and landscape evolution

Bioevents either relate to diversification of a particular fossil group or a reduction, these may equate to speciation events or extinction events, or may only represent migration.

(3.9 Billion Years since the Birth of Earth, and 2.9 Billion Years since Microorganisms Formed)The earth was completely covered in Ice.

He undertook postdoctoral research at Aberystwyth, and then at the University of Adelaide and Risø National Laboratory.

In 1995 he returned to Aberystwyth to take up a lectureship.

Land plants began to diversify in the Late Silurian, from around 430 million years ago, and the results of their diversification are displayed in remarkable detail in an early Devonian fossil assemblage from the Rhynie chert.

This chert, formed in volcanic hot springs, preserved several species of early plants in cellular detail by petrification.

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