Passing of Dr. John F. Riva

With regret, we announce the passing of long-time Atlantic Geology associate editor Dr. John F. Riva on July 29th, 2020, in Québec City at the age of 91.  Dr. Riva was one of the leading specialists on Ordovician graptolites of North America and worked worldwide with many colleagues on other topics related to graptolite research.