''Watinoceras'' is a genus of acanthoceratid ammonite that lived during the early

Turonian The Turonian is, in the ICS' geologic timescale, the second age in the Late Cretaceous Epoch, or a stage in the Upper Cretaceous Series. It spans the time between 93.9 ± 0.8 Ma and 89.8 ± 1 Ma (million years ago). The Turonian is preceded b ...

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 ''Mammites'' is a Late Cretaceous (Cenomanian to Turonian) ammonite genus included in the acanthoceratoidean family, Acanthoceratidae, and the type genus for the subfamily Mammitinae. ''Mammites'' was named by Laube and Bruder in 1887. Specie ...

'' gave rise to the other genera in the subfamily. Older classifications included ''Watinoceras'' in the subfamily

Mammitinae Mammitinae comprises a subfamily within the Acanthoceratidae (Ammonoidea) characterized by moderately to very evolute shells with rectangular to squarish whorl sections along with blunt umbilical and prominent inner and outer ventrolateral tuberc ...

instead. Species include ''Watinoceras 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.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, Northwest Territories * Mesitas del Colegio and Yaguará, Colombia * Brießnitz Formation, Germany * Agua Nueva and Indidura Formations, Mexico * Eze-Aku Formation, Nigeria * Draa el Miaad, Tunisia *

Mancos Shale The Mancos Shale or Mancos Group is a Late Cretaceous (Upper Cretaceous) geologic formation of the Western United States. The Mancos Shale was first described by Cross and Purington in 1899 and was named for exposures near the town of Mancos, ...

, Arizona and New Mexico * Greenhorn Formation, Colorado and Minnesota * Colorado Group, Colorado and New Mexico * La Luna Formation, Venezuela

References

* W.J. Arkell ''et al.'', 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology 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