- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
"Four species of Exoconularia, including E. istanbulensis, sp. nov., and one Archaeoconularia, are recorded from beds hitherto regarded as Silurian, but which are now shown to be of middle Ordovician age. A revised stratigraphical succession is proposed."