2017 Ancestor's Trail Hike   
in memory of Rob Stewart

Tracing our common ancestry with all other multicellular life 
over the last billion years of evolutionary time. 
A 12.5k hike where each average stride = 60,000 years. 
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Dinosaurs flourish.

 4th Major Extinction - Jurassic/Triassiac - 205mya

Triassic–Jurassic extinction event (End Triassic): 205 Ma at the Triassic-Jurassic transition. About 23% of all families and 48% of all genera (20% of marine families and 55% of marine genera) went extinct.[6] Most non-dinosaurian archosaurs, most therapsids, and most of the large amphibians were eliminated, leaving dinosaurs with little terrestrial competition. Non-dinosaurian archosaurs continued to dominate aquatic environments, while non-archosaurian diapsidscontinued to dominate marine environments. The Temnospondyl lineage of large amphibians also survived until the Cretaceous in Australia (e.g., Koolasuchus).

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