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Höör Sandstone
The Höör Sandstone is a Formation (geology), geologic formation in Skåne County, southern Sweden. It is Early Jurassic (Hettangian-Pliensbachian) in age. This unit outcrops in central Skane on a few isolated exposures, being traditionally subdivided into the lower “millstone” (“kvarnstenen”) and the upper “buildingstone”. The lowermost layers where also claimed to host Rhaetian strata, however latter works suggested that the layers devolved as red beds, were part of the new Hörby Formation, thus delimitating the Höör sandstone to the lower Jurassic. It has been assumed to be limited to Hettangian-Sinemurian layers, yet recent palynological analysis suggest the uppermost section is of Pliensbachian age, underlying and maybe interacting with the younger volcanic deposits. The Höör sandstone represents a mostly fluvial unit with a rich collection of fossil plants, yet also includes brackish bivalves in some layers, pointing to marine ingressions locally. Members St ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formation (stratigraphy)
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness (geology), thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planolites
''Planolites'' is an ichnogenus found throughout the Ediacaran and the Phanerozoic that is made during the feeding process of worm-like animals. The traces are generally small, , unlined, and rarely branched, with fill that differs from the host rock. Distribution ''Planolites'' fossils have been found in Africa, Asia, Europe, Antarctica, and the Americas (though many more specimens have been found in North America). Ichnospecies Ichnospecies in ''Planolites'' include: *''P. annularis'' Walcott, 1890 *''P. annularius'' Walcott, 1890 *''P. ballandus'' Webby, 1970 *''P. beverleyensis'' Billings, 1862 *''P. incipiens'' (Billings, 1861) *''P. montanus'' Richter, 1937 *''P. reticulatus'' Alpert, 1975 *''P. serpens'' Webby, 1970 *''P. striatus'' ( Hall, 1852) *''P. terraenovae'' Fillion and Pickerill, 1990 *''P. virgatus'' (Hall, 1847) See also List of Ediacaran genera This is a list of all described Ediacaran genera, including the Ediacaran biota. It contains 227 genera. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cardinia (Bivalve) , a bus and coach operator
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Cardinia may refer to: * Cardinia, Victoria * Shire of Cardinia, Victoria * Cardinia Creek ** Cardinia Reservoir ** Cardinia Dam Power Station * Cardinia Transit Cardinia Transit was a bus and coach operator in Melbourne, Australia. As a Melbourne bus company, it operated 15 bus routes under contract to the Government of Victoria. A subsidiary of Grenda Corporation, it was purchased by Ventura Bus L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liostrea Socialis 783
''Liostrea'' is a genus of extinct oysters, marine bivalve mollusks in the family Gryphaeidae. These fossils range from the early Triassic Period to the Cenomanian Epoch of the late Cretaceous Period and were widely distributed geographically. They were encrusting organisms, attaching firmly to the substrate on their left shell, and were important Jurassic reef-forming organisms. The species ''L. erina'' and ''L. roemeri'' attached themselves to living ammonoids. ''Liostrea'' formed abundant ostreoliths (concretions composed of encrusting organisms) on the hardgrounds of the Jurassic Carmel Formation The Carmel Formation is a geologic formation in the San Rafael Group that is spread across the U.S. states of Wyoming, Utah, Colorado, north east Arizona and New Mexico. Part of the Colorado Plateau, this formation was laid down in the Middle J ... in southwestern Utah. ''Liostrea'' may be the earliest oyster lineage, with possible examples attached to ammonoids o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ostreida
The order Ostreida includes the true oysters. One superfamily (Ostreoidea) and two extant families are recognised within it. The two families are Ostreidae, the true oysters, and Gryphaeidae The Gryphaeidae, common name the foam oysters or honeycomb oysters, are a family of marine bivalve mollusks. This family of bivalves is very well represented in the fossil record, however the number of living species is very few. All species h ..., the foam oysters. 2010 taxonomy In 2010, a new proposed classification system for the Bivalvia was published by Bieler, Carter & Coan, revising the classification of the Bivalvia, including the order Ostreida.Bieler, R., Carter, J.G. & Coan, E.V. (2010) ''Classification of Bivalve families''. Pp. 113-133, in: Bouchet, P. & Rocroi, J.P. (2010), ''Nomenclator of Bivalve Families. Malacologia'' 52(2): 1-184 References External links European checklist of marine species, for Molluscs {{Taxonbar, from=Q133047 Bivalve orders ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ostreidae
The Ostreidae, the true oysters, include most species of molluscs commonly consumed as oysters. Pearl oysters are not true oysters, and belong to the order Pteriida. Like scallops, true oysters have a central adductor muscle, which means the shell has a characteristic central scar marking its point of attachment. The shell tends to be irregular as a result of attaching to a substrate. Both oviparous (egg-bearing) and larviparous (larvae-bearing) species are known within Ostreidae. Both types are hermaphrodites. However, the larviparous species show a pattern of alternating sex within each individual, whereas the oviparous species are simultaneous hermaphrodites, producing either female or male gametes according to circumstances. Members of genus ''Ostrea'' generally live continually immersed and are quite flat, with roundish shells. They differ from most bivalves by having shells completely made up of calcite, but with internal muscle scars of aragonitic composition. They fare ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oyster
Oyster is the common name for a number of different families of salt-water bivalve molluscs that live in marine or brackish habitats. In some species, the valves are highly calcified, and many are somewhat irregular in shape. Many, but not all oysters are in the superfamily Ostreoidea. Some types of oysters are commonly consumed (cooked or raw), and in some locales are regarded as a delicacy. Some types of pearl oysters are harvested for the pearl produced within the mantle. Windowpane oysters are harvested for their translucent shells, which are used to make various kinds of decorative objects. Etymology The word ''oyster'' comes from Old French , and first appeared in English during the 14th century. The French derived from the Latin , the feminine form of , which is the latinisation of the Ancient Greek () 'oyster'. Compare () 'bone'. Types True oysters True oysters are members of the family Ostreidae. This family includes the edible oysters, which mainly belong t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liostrea
''Liostrea'' is a genus of extinct oysters, marine bivalve mollusks in the family Gryphaeidae. These fossils range from the early Triassic Period to the Cenomanian Epoch of the late Cretaceous Period and were widely distributed geographically. They were encrusting organisms, attaching firmly to the substrate on their left shell, and were important Jurassic reef-forming organisms. The species ''L. erina'' and ''L. roemeri'' attached themselves to living ammonoids. ''Liostrea'' formed abundant ostreoliths (concretions composed of encrusting organisms) on the hardgrounds of the Jurassic Carmel Formation in southwestern Utah Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to it .... ''Liostrea'' may be the earliest oyster lineage, with possible examples attached to ammonoids of the earli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diplocraterion
''Diplocraterion'' is an ichnogenus describing vertical U-shaped burrows having a spreite (weblike construction) between the two limbs of the U. The spreite of an individual ''Diplocraterion'' trace can be either protrusive (between the paired tubes) or retrusive (below the paired tubes). Some ichnospecies have both types (e.g., ''Diplocraterion yoyo''). The presence/absence of funnel-shaped openings should not be used as an ichnotaxobase due to the high probability that the upper portions of the trace may have been eroded away. Observation of the orientation of ''Diplocraterion'' in the field is frequently used to determine the way up of rock strata at outcrop. There are several ichnospecies of ''Diplocraterion''. Ethology The various ichnospecies of ''Diplocraterion'' provide a good example of how ethology (animal-substrate interactions and behavior) can be interpreted from trace fossils. ''Diplocraterion'' is a classic example of equilibrichnia (equilibrium traces). Thes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhizocorallium
''Rhizocorallium'' is an ichnogenus of burrow, the inclination of which is typically within 10° of the bedding planes of the sediment. These burrows can be very large, over a meter long in sediments that show good preservation, e.g. Jurassic rocks of the Yorkshire Coast (eastern United Kingdom), but the width is usually only up to 2 cm, restricted by the size of the organisms producing it. It is thought that they represent fodinichnia as the animal (probably a polychaete) scoured the sediment for food. Ichnogenus The ichnogenus ''Rhizocorallium'' Zenker 1836 includes three ichnospecies: ''Rhizocorallium jenense'' Zenker 1836 representing straight, short U-shaped spreite Spreite, meaning Lamina (leaf), leaf-blade in German (or spreiten, the plural form in German language, German) is a stacked, curved, layered structure that is characteristic of certain trace fossils. They are formed by invertebrate organisms tunn ...-burrows commonly oblique to bedding plane, and only rare ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
