The Ediacaran period represents the earliest appearance of complex life. It’s a fascinating era with many puzzles. Chief among them are the Rangeomorphs, an enigmatic group of organisms that were ubiquitous in fossil assemblages over 580 mya, 40 million years before the “Cambrian explosion.”.
Animal? plant? aliens? Chances are you have never met a crinoid, although they are one of the most common invertebrate creatures along the California coast below 75 ft depths. Meet Florometra serratissima, the common crinoid or feather star of the Pacific coast. They average around 8-10 inches in height but are as light as a…