Helminthorhaphe Fossil
Amercian Geophysical Union Blogosphere
blogs.agu.org
American Geophysical Union
https://blogs.agu.org/mountainbeltway/2011/02/10/treasure-trove-of-traces/
Helminthorhaphe Fossil
flickr (Algorri Interpretazio Zentroa)
www.flickr.com
