Abstract Constraining the positions of, and interrelationships between, Earth's major continental blocks has played a role in validating concept of supercontinent cycle. Minor fragments can provide additional key constraints on modes assembly dispersal. The Tarim craton been placed both at core Rodinia or its periphery, differentiating between two scenarios widespread implications for breakup s...

In the annals of Earth history, few associations have proven more iconic or durable than that between animals and oxygen. As early as 1919, the experimental physiologist August Krogh (1) explored the relationship between O2 and animal anatomy, and 40 y later J. R. Nursall (2) posited explicitly that metazoans appear as fossils only in uppermost Proterozoic rocks because pO2 was insufficient to ...