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Triassic-Jurassic extinction event http://www.stratigraphy.org/index.php/ics-chart-timescale Brack et al. give 207 to 201 million years ago See Gradstein

Rauisuchia Geologic time scale http://www.stratigraphy.org/index.php/ics-chart-timescale According to Gradstein (2004). Brack et al. (2005) give

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