Английская Википедия:Cremnoceramus
Шаблон:Short description Шаблон:Automatic taxobox
Cremnoceramus ("cremno-" = kremnos [Greek]: precipice or over hanging wall or bank; "ceramus" = keramos [Greek]: clay pot) is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus Pteria. They lived from the Turonian to the Maastrichtian of the Late Cretaceous.[1][2]
Description
Cremnoceramus were facultatively mobile, blind, suspension feeding bivalves with low-magnesium calcite shells.[2] Inoceramids, like the Cremnoceramus in particular, had thick shells composed of particular "prisms" of calcite deposited perpendicular to the surface, and unweathered fossils commonly preserve the mother-of-pearl luster the shells had in life.[3] Compared to the many examples of broad and flattened Inoceramidae, Cremnoceramus shells are rather "high-walled", deep bowl-shaped. The top shell is commonly encrusted with oysters.
Species
The following species are recognized:[4] Шаблон:Div col
- C. crassus
- C. deformis
- C. inconstans
- C. rotundatus
- C. waltersdorfensis
Biostratigraphic significance
The first appearance of the species Cremnoceramus rotundatus marks the beginning of the Coniacian stage.
Distribution
Fossils of the genus have been found in:[5]
- Gosau Formation, Austria
- Cotinguiba Formation, Brazil
- Pointe-Noire, Congo-Brazzaville
- Jicin, the Czech Republic
- Arnager Limestone Formation, Denmark
- Craie de Villedieu Formation, France
- Germany
- Anaipadi Formation, India
- Tongobury, Madagascar
- Austin Group, Mexico
- Sant Corneli and El Zadorra Formation, Spain
- Lewes Nodular Chalk Formation, the United Kingdom
- Niobrara Formation, New Mexico, United States
Gallery
Note the oyster encrustation of the top shells:
-
Anterior section of articulated C. deformis (Fort Hays ls.)
-
Anterior section of articulated C. deformis (Fort Hays ls.)
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Vental section of articulated C. deformis (Fort Hays ls.)
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Vental section of articulated C. deformis (Fort Hays ls.)
References
Шаблон:Cretaceous-animal-stub Шаблон:Paleo-bivalve-stub
- Страницы с неработающими файловыми ссылками
- Английская Википедия
- Inoceramidae
- Prehistoric bivalve genera
- Index fossils
- Coniacian life
- Cretaceous Austria
- Fossils of Austria
- Cretaceous Brazil
- Fossils of Brazil
- Fossils of the Czech Republic
- Cretaceous Denmark
- Fossils of Denmark
- Cretaceous France
- Fossils of France
- Cretaceous Germany
- Fossils of Germany
- Cretaceous India
- Fossils of India
- Cretaceous Madagascar
- Fossils of Madagascar
- Cretaceous Mexico
- Fossils of Mexico
- Cretaceous Spain
- Fossils of Spain
- Cretaceous England
- Fossils of England
- Cretaceous geology of New Mexico
- Fossils of the United States
- Fossil taxa described in 1969
- Страницы, где используется шаблон "Навигационная таблица/Телепорт"
- Страницы с телепортом
- Википедия
- Статья из Википедии
- Статья из Английской Википедии
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