''Berriasella'' is a discoidal evolute perisphinctacean

ammonite Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ...

, and type genus for the neocomitid subfamily

Berriasellinae Berriasellinae is a subfamily of very late Jurassic and very early Cretaceous Perisphinctaceae, perisphinctoid ammonites in the family Neocomitidae. Berriasellinae comprises generally compressed, evolute genera, typically with furcated ribbing, ...

. 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 ''Berriasella'' is a discoidal evolute Perisphinctaceae, perisphinctacean ammonite, and type genus for the Neocomitidae, neocomitid subfamily Berriasellinae. Its ribbing is distinct, consisting of both simple and bifurcated ribs that extend from ...

'' traditionally has been regarded an index fossil defining the base of the

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...

, however since 2016 this had been replaced by the first occurrence of '' Calpionella alpina''.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 The Late Jurassic is the third epoch of the Jurassic Period, and it spans the geologic time from 161.5 ± 1.0 to 143.1 ± 0.8 million years ago (Ma), which is preserved in Upper Jurassic strata.Owen 1987. In European lithostratigraphy, the name ...

Tithonian In the geological timescale, the Tithonian is the latest age (geology), age of the Late Jurassic Epoch and the uppermost stage (stratigraphy), stage of the Upper Jurassic Series. It spans the time between 149.2 ±0.7 annum, Ma and 143.1 ±0.6 (mi ...

, to the early

Lower Cretaceous Lower may refer to: * ''Lower'' (album), 2025 album by Benjamin Booker * Lower (surname) * Lower Township, New Jersey *Lower Receiver (firearms) * Lower Wick Gloucestershire, England See also * Nizhny {{Disambiguation ...

Berriasian In the geological timescale, the Berriasian is an age/ stage of the Early/Lower Cretaceous. It is the oldest subdivision in the entire Cretaceous. It has been taken to span the time between 143.1 ±0.6 Ma and 137.05 ± 0.2 (million years ago) ...

and has a fairly worldwide distribution.Paleobiology Database - ''Berriasella''
at

Fossilworks Fossilworks was a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database, a large relational database assembled by hundreds of paleontologists from around the world. History Fossilworks was cr ...

.org

Distribution

Fossils of ''Berriasella'' have been found in: ;Jurassic * Latady and Himalia Ridge Formations, Antarctica *

Los Molles Formation The Los Molles Formation is a geologic formation of Early to Middle Jurassic age, located at northern and central part of Neuquén Basin at Mendoza Shelf in Argentina Argentina, officially the Argentine Republic, is a country in the s ...

, Argentina *

Guasasa Formation The Guasasa Formation is a geologic formation in Cuba. It is Tithonian to Early Valanginian in age and contains fossils of ammonites. Description It primarily consists of limestone Limestone is a type of carbonate rock, carbonate sediment ...

, Cuba * Chia Gara Formation, Iraq *

Muktinath Muktinath is an ancient Vishnu temple located in Mustang, Nepal. The temple of Muktinath, known as 'the lord of liberation', is sacred to both Hindus and Buddhists whom they worship as an abode of Hindu deity Vishnu and Buddhist deity Avalokiteśv ...

, Nepal *

Punta Moreno Formation Punta is an Afro-Indigenous dance and cultural music deeply rooted in the cultural traditions of the Garifuna of Honduras. It heavily incorporates West African/Central African drumming, the dance primarily of Angola and Congo origins. The musi ...

, Peru *

Hajar Formation Hajar may refer to: Places * Hajar Mountains, mountains in northern Oman and also the eastern United Arab Emirates ** Central Hajar Mountains, the central subrange of the Hajar, entirely in Oman ** Eastern Hajar Mountains, the eastern subrange ...

, Yemen ;Cretaceous *

President Beaches Formation President most commonly refers to: *President (corporate title) *President (education), a leader of a college or university *President (government title) President may also refer to: Arts and entertainment Film and television *'' Præsidente ...

, Antarctica * Guchuochun Formation, China *

Buenavista Breccia Buenavista may refer to: Colombia * Buenavista, Boyacá, a municipality in the department of Boyacá * Buenavista, Córdoba, a municipality in the department of Córdoba * Buenavista, Sucre, a municipality in the department of Sucre * Buenavista ...

, Colombia * Stramberk Formation, Czech Republic * France * Szentivánhegy Limestone, Hungary * Giumal Sandstone, India *

Shal Formation Shal () is a city in, and the capital of, Shal District of Buin Zahra County, Qazvin province, Iran. Demographics Population At the time of the 2006 National Census, the city's population wa 15,104 in 3,348 households. The following censu ...

, Iran * Chia Gara Formation, Iraq * Carbonera and Taraises Formations, Mexico *

Pieniny Limestone The Pieniny (sometimes also the PieninsSzafer, Władysław. 2013. ''The Vegetation of Poland: International Series of Monographs in Pure and Applied Biology''. Warsaw: Pergamon Press, pp. 156, 388. or the Pienin Mountains,Griffiths, Graham C. D ...

and Rogozno Formation, Poland * Chigan Formation, Russia *

Tollo Tollo is a ''comune'' and town in the Province of Chieti in the Abruzzo region of Italy. Tollo is renowned for its vineyards and olive groves. It is situated in the 'Hills of the Teatina' (''colline teatine''), a group of foothills of the Apennine ...

and Miravetes Formations, Spain * Dvuyakornaya Formation, Ukraine *

, Yemen * Lo valdes Formation, Chile

Distribution

References

Further reading