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Aymamón Limestone
The Aymamón Limestone is a geologic formation in Puerto Rico. It preserves fossils dating back to the Middle to Late Miocene period. at .org Fossil content Various fossils have been found in the Aymamón Limestone:Rio Guajataca Sectionat .org |
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] |
Orthaulax
''Orthaulax'' is an extinct genus of sea snails in the family Strombidae. Species *'' O. aguadillensis'' ( Maury, 1920) *'' O. altilis'' ( Pilsbry, 1922) *'' O. bermudezi'' (Clench and Aguayo, 1939) *'' O. brasiliensis'' ( Maury, 1925) *'' O. caepa'' ( Cooke, 1921) *'' O. conoides'' ( Woodring, 1923) *'' O. dainellii'' ( Savazzi, 1989) *'' O. gabbi'' ( Dall, 1890) *'' O. hernandoensis'' (Mansfield Mansfield is a market town and the administrative centre of Mansfield District in Nottinghamshire, England. It is the largest town in the wider Mansfield Urban Area (followed by Sutton-in-Ashfield). It gained the Royal Charter of a market tow ..., 1937) *'' O. inornatus'' ( Gabb, 1872) *'' O. japonicus'' (Nagao, 1924) *'' O. portoricoensis'' (Hubbard, 1921) *'' O. pugnax'' ( Heilprin, 1887) *'' O. seaforthensis'' ( Trechmann, 1941) References Strombidae {{Strombidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologic Formations Of Puerto Rico
Geology () is a branch of natural science concerned with Earth and other Astronomical object, astronomical objects, the features or rock (geology), rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth science, Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the Relative dating, relative and Geochronology, absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Eart ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Fossiliferous Stratigraphic Units In Puerto Rico
The Paleobiology Database lists no known fossiliferous stratigraphic units in Dominica, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines. The database also records no fossiliferous stratigraphic units within several regions of the Caribbean like the Archipelago of San Andrés, Providencia and Santa Catalina, Guadeloupe, Martinique, Bonaire, Saba, Sint Eustatius, and Nueva Esparta. Antigua and Barbuda The Bahamas Barbados Cuba Dominican Republic Grenada Haiti Jamaica Trinidad and Tobago Dependencies of France The Paleobiology Database lists no known fossiliferous stratigraphic units in the French dependencies of St. Barthélemy or St. Martin. Dependencies of the Netherlands The Paleobiology Database lists no known fossiliferous stratigraphic units in the Dutch dependencies of Aruba, Bonaire, Saba, Sint Eustatius and Sint Maarten. Curaçao Dependencies of the United Kingdom The Paleobiology Dat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stylophora
The stylophorans are an extinct, possibly polyphyletic group allied to the Paleozoic Era echinoderms, comprising the prehistoric cornutes and mitrates. It is synonymous with the subphylum Calcichordata. Their unusual appearances have led to a variety of very different reconstructions of their anatomy, how they lived, and their relationships to other organisms. Stylophorans have played a major role in debates over the origin of chordates, as under the calcichordate hypothesis they were interpreted as being stem-group chordates. However, multiple lines of evidence argue against the calcichordate hypothesis, and stylophorans are now widely agreed to belong to the echinoderm total group. Debate remains over whether they are stem-group echinoderms which predate the origin of radial symmetry, or highly modified descendants of radially symmetric echinoderms. Description The general stylophoran body plan consists of a flattened theca and a single jointed appendage which extends from i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siderastrea
Siderastreidae is a Family (biology), family of reef building Scleractinia, stony corals. Members of the family include Symbiosis, symbiotic algae called Zooxanthellae in their tissues which help provide their energy requirements. Description Members of this family are Colony (biology), colonial, hermatypic (reef-building) corals. The corals vary in form and include massive, thickly encrusting, columnar, and irregular forms. The corallites are linked by flowing Septum (coral), septa that have granular margins and that are fused in the centre to give fan-shaped or star-shaped groupings. The corallites do not project from the surface of the coral and have ill-defined walls formed from thickened septa.Family Siderastreidae WetWebMedia.com. Retrieved 2011-12-18. Genera The World Register of Marine Species includ ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porites
''Porites'' is a genus of stony coral; they are small polyp stony (SPS) corals. They are characterised by a finger-like morphology. Members of this genus have widely spaced calices, a well-developed wall reticulum and are bilaterally symmetrical. ''Porites'', particularly '' Porites lutea'', often form microatolls. Corals of the genus ''Porites'' also often serve as hosts for Christmas tree worms (''Spirobranchus giganteus''). Aquarium trade Specimens of ''Porites'' are sometimes available for purchase in the aquarium trade. Due to the strict water quality, lighting and dietary requirements, keeping ''Porites'' in captivity is very difficult. Paleoclimatology Porites corals have been shown to be accurate and precise recorders of past marine surface conditions. Measurements of the oxygen isotopic composition of the aragonitic skeleton of coral specimens indicate the sea-surface temperature conditions and the oxygen isotopic composition of the seawater at the time of growth. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Montastraea
''Montastraea'' is a genus of colonial Scleractinia, stony coral found in the Caribbean seas. It is the only genus in the monotypic family Montastraeidae and contains a single species, ''Montastraea cavernosa'', known as great star coral. It forms into massive boulders and sometimes develops into plates. Its polyp (zoology), polyps are the size of a human thumb and fully extend at night. Description Great star coral colonies form massive boulders and domes over 5 feet (1.5 m) in diameter in waters of shallow and moderate depths. In deeper waters, this coral has been observed growing as a plate formation. It is found throughout most reef environments, and is the predominant coral at depths of 40–100 feet (12.2-30.5 m). This coral occasionally has a fluorescent red or orange color during daytime; it has recently been suggested that this hue is due to phycoerythrin, a cyanobacterial protein. It appears that, in addition to symbiosis, symbiotic Symbiodinium, zooxanthella, this cor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meandrina
''Meandrina'' is a genus of colonial stony coral in the family Meandrinidae. Corals in this genus form massive hemispherical heads or have large flat plates and can grow to a metre (yard) across. Sometimes it is referred to as brain coral. Species The World Register of Marine Species lists the following species: * ''Meandrina brasiliensis'' (Milne Edwards & Haime, 1848) * ''Meandrina danae'' (Milne Edwards & Haime, 1848) * ''Meandrina jacksoni'' Weil & Pinzón, 2011 * ''Meandrina meandrites'' (Linnaeus, 1758) * †''Meandrina polygonalis ''Meandrina'' is a genus of colonial stony coral in the family Meandrinidae. Corals in this genus form massive hemispherical heads or have large flat plates and can grow to a metre (yard) across. Sometimes it is referred to as brain coral. Speci ...'' Catullo, 1856 References Scleractinia genera Meandrinidae Taxa named by Jean-Baptiste Lamarck {{scleractinia-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Goniopora
''Goniopora'', often called flowerpot coral, is a genus of colonial stony coral found in lagoons and turbid water conditions. ''Goniopora'' have numerous daisy-like polyps that extend outward from the base, each tipped with 24 stinging tentacles which surrounds a mouth. Distribution Species of ''Goniopora'' can be found in the Persian Sea areas, the Indian Ocean, and various tropical and subtropical areas of the Pacific Ocean. Various species live as far north as Hong Kong (where they are the dominant colonial non-reef-building coral) and southern Japan. Goniopera were present in the Caribbean during the ''Miocene Epoch'', although they have since gone locally extinct there. Care ''Goniopora'' is a sensitive coral that when probed can sensitise and contract . Goniopora are a very difficult coral to keep alive and are not recommended for a novice reef aquarium hobbyist. The short, greenish-colored species are less sturdy and durable than the pink or purple species. Many pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
