A beautiful and well preserved 500 million year old polychaete fossil was discovered in British Columbia, Canada. An article in National Geographic can be found here: https://news.nationalgeographic.com/2018/01/annelid-bristle-worm-fossil-discovered-canada-spd/
Michael Reuscher, Ph.D.
Postdoctoral Research Associate
Ecosystem Studies & Modeling
Harte Research Institute for Gulf of Mexico Studies
Texas A&M University - Corpus Christi
6300 Ocean Drive, Unit 5869
Corpus Christi, Texas 78412-5869