Isolated sponge spicules from the late Cambrian Alum Shale Formation ('Orsten' nodules) of Sweden

C. Castellani, A. Maas, C. Haug, J.T. Haug, D. Waloszek
2012 Bulletin of Geosciences  
doi:10.3140/bull.geosci.1328 fatcat:lqv4mdx3a5cdzhprypfq3sek3q