''Watinoceras'' is a genus of acanthoceratid

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 ...

that lived during the early

Turonian The Turonian is, in the International Commission on Stratigraphy, ICS' geologic timescale, the second age (geology), age in the Late Cretaceous epoch (geology), Epoch, or a stage (stratigraphy), stage in the Upper Cretaceous series (stratigraphy), ...

stage of the Late Cretaceous.

Description

Early whorls are compressed, finely ribbed with inner and outer ventrolateral and siphonal tubercles as in '' Neocardioceras'', but siphonal row is soon lost. Later the venter may be concave between rows of ventrolateral clavi or rounded with ribs passing over in chevrons. Ornament usually becomes coarser with age. Derivation is from ''Neocardioceras'', ''Watinoceras'' and '' Mammites'' gave rise to the other genera in the subfamily Acanthoceratinae. Older classifications included ''Watinoceras'' in the subfamily Mammitinae instead. Species include ''W. coloradoense'', ''W. reesidei'', and ''W. thompsonense''.

Biostratigraphic significance

The first occurrence of the species ''Watinoceras devonense'' marks the beginning of the

Distribution

Fossils of the genus have been found in:''Watinoceras''
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 * Ponta das Salinas, Angola * Cotinguiba Formation, Brazil * Mungo River Formation, Cameroon * Blackstone Formation, Alberta, Canada * Second White Speckled Shale and Kaskapu Formations, British Columbia * McKenzie River Valley,

Pacific Northwest The Pacific Northwest (PNW; ) is a geographic region in Western North America bounded by its coastal waters of the Pacific Ocean to the west and, loosely, by the Rocky Mountains to the east. Though no official boundary exists, the most common ...

* Mesitas del Colegio and

Yaguará Yaguará () is a town and municipality in the Huila Department, Colombia. The urban centre is located at an elevation of in the Magdalena River, Magdalena River Valley and the Cordillera Oriental (Colombia), Eastern Ranges of the Colombian Andes. ...

, Colombia * Brießnitz Formation, Germany * Agua Nueva and Indidura Formations, Mexico * Eze-Aku Formation, Nigeria * Draa el Miaad, Tunisia * Mancos Shale, Arizona and New Mexico * Greenhorn Formation, Colorado and Minnesota * Colorado Group, Colorado and New Mexico *

La Luna Formation LA most frequently refers to Los Angeles, the second most populous city in the United States of America. La, LA, or L.A. may also refer to: Arts and entertainment Music * La (musical note), or A, the sixth note *"L.A.", a song by Elliott Smi ...

, Venezuela

References

Pat L Mollusca 4. Geological Society of America and University of Kansas Press.
J. Kennedy ''et al.'', 1999. Lower Turonian (Upper Cretaceous) ''Watinoceras devonense'' Zone ammonite fauna in Colorado, USA. USGS Publications Warehouse - Citations View
Acanthoceratidae Ammonitida genera Index fossils Turonian life Late Cretaceous ammonites Ammonites of Africa Fossils of Angola Cretaceous Cameroon Fossils of Cameroon Cretaceous Nigeria Fossils of Nigeria Cretaceous Tunisia Fossils of Tunisia Ammonites of Europe Cretaceous Germany Fossils of Germany Ammonites of North America Cretaceous Alberta Cretaceous British Columbia Cretaceous Northwest Territories Fossils of Canada Cretaceous Mexico Fossils of Mexico Cretaceous Arizona Cretaceous Colorado Cretaceous Minnesota Cretaceous geology of New Mexico Fossils of the United States Ammonites of South America Cretaceous Brazil Fossils of Brazil Cretaceous Colombia Fossils of Colombia Cretaceous Venezuela Fossils of Venezuela Fossil taxa described in 1930 {{ammonitina-stub

Description

Biostratigraphic significance

Distribution

References

Further reading