Berriasella

Berriasella is a discoidal evolute perisphinctacean ammonite, and type genus for the neocomitid subfamily Berriasellinae. Its ribbing is distinct, consisting of both simple and bifurcated ribs that extend from the umbilical seam across the venter; its whorl section generally compressed, the venter more or less narrowly rounded. The species Berriasella jacobi traditionally has been regarded an index fossil defining the base of the Cretaceous, however since 2016 this had been replaced by the first occurrence of Calpionella alpina. Some authors regard B. jacobi as instead belonging to the genus Strambergella.

Berriasella, named by Uhlig, 1905, is known from the late Upper Jurassic, Tithonian, to the early Lower Cretaceous, Berriasian and has a fairly worldwide distribution.

Distribution

Fossils of Berriasella have been found in: Jurassic Latady and Himalia Ridge Formations, Antarctica Los Molles Formation, Argentina Guasasa Formation, Cuba Chia Gara Formation, Iraq Muktinath, Nepal Punta Moreno Formation, Peru Hajar Formation, Yemen

Cretaceous

President Beaches Formation, Antarctica

Guchuochun Formation, China

Buenavista Breccia, Colombia

Stramberk Formation, Czech Republic

France

Szentivánhegy Limestone, Hungary

Giumal Sandstone, India

Shal Formation, Iran

Chia Gara Formation, Iraq

Carbonera and Taraises Formations, Mexico

Pieniny Limestone and Rogozno Formation, Poland

Chigan Formation, Russia

Tollo and Miravetes Formations, Spain

Dvuyakornaya Formation, Ukraine

Hajar Formation, Yemen

References

Further reading

Perisphinctoidea

Ammonitida families

Index fossils

Tithonian first appearances

Early Cretaceous genus extinctions

Cretaceous ammonites

Jurassic ammonites

Ammonites of Asia

Cretaceous China

Fossils of China

Fossils of India

Fossils of Iraq

Fossils of Iran

Fossils of Nepal

Fossils of Yemen

Ammonites of Antarctica

Ammonites of Europe

Fossils of the Czech Republic

Cretaceous France

Fossils of France

Fossils of Hungary

Fossils of Poland

Cretaceous Russia

Fossils of Russia

Cretaceous Spain

Fossils of Spain

Fossils of Ukraine

Ammonites of North America

Jurassic Cuba

Fossils of Cuba

Jurassic Mexico

Cretaceous Mexico

Fossils of Mexico

Ammonites of South America

Jurassic Argentina

Cretaceous Argentina

Fossils of Argentina

Cretaceous Colombia

Fossils of Colombia

Jurassic Peru

Fossils of Peru

Fossil taxa described in 1905