Sinotubulites

Sinotubulites is a genus of small, tube-shaped shelly fossils from near the terminal boundary of the Ediacaran period in formations within China and North America. It is often found in association with Cloudina, and much like Cloudina, is important to studies done on the Cambrian Explosion. They often had a kind of compressed accordion-like appearance rather than the stacked cones of Cloudina.