Ancient trackways in seabed mud show animals moved purposefully 10 million years before the Cambrian Explosion.

Experts analyzed 170 trace fossils from millions of years before the Cambrian Period and assert that advanced features may have been a reality before the explosion.

"Cambrian Explosion: New timeline for appearances of skeletal animals in fossil record." ScienceDaily. ScienceDaily, 10 November 2010. <www.sciencedaily.com / releases / 2010 / 11 / 101110091115.htm>.

Meanwhile, authors revised the Cambrian chronostratigraphy of China and proposed a new Xiaotanian Stage for the Cambrian Stage 2 of China. In addition, ...