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Figueroa Sulfide
The Figueroa Sulfide (also known as Figueroa Hydrothermal vent or Figueroa Massive Sulfide) is a geological formation in California, USA, dating to roughly between 185 and 181 Mya (unit), million years ago and covering the Pliensbachian-Toarcian Faunal stage, stages of the Jurassic Period in the Mesozoic Era. This deposits represent deep sea hydrothermal vents, with the oldest confirmed record of Siboglinidae and adjacent biotas, being one of the oldest records of such ecosystem, with similar occurrences found elsewhere in the Americas, for example from Los Molles Formation of Argentina. Paleoenvironment The ''Figueroa Sulfide'' is located in the San Rafael Mountains and is part of the Franciscan Complex, which formed during subduction of the Farallon Plate. This geological formation includes altered basalts, Serpentinite, serpentinites, cherts, and tectonically sheared mudstones. The ''Figueroa Sulfide'' consists of a 1.5-meter-thick sulfide lens with a silicified core, flanked ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Formation
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] |
Radiolaria
The Radiolaria, also called Radiozoa, are unicellular eukaryotes of diameter 0.1–0.2 mm that produce intricate mineral skeletons, typically with a central capsule dividing the cell into the inner and outer portions of endoplasm and ectoplasm. The elaborate mineral skeleton is usually made of silica. They are found as zooplankton throughout the global ocean. As zooplankton, radiolarians are primarily heterotrophic, but many have photosynthetic endosymbionts and are, therefore, considered mixotrophs. The skeletal remains of some types of radiolarians make up a large part of the cover of the ocean floor as siliceous ooze. Due to their rapid change as species and intricate skeletons, radiolarians represent an important diagnostic fossil found from the Cambrian onwards. Description Radiolarians have many needle-like pseudopods supported by bundles of microtubules, which aid in the radiolarian's buoyancy. The cell nucleus and most other organelles are in the endoplasm, wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ninth and longest geological period of the entire Phanerozoic. The name is derived from the Latin , 'chalk', which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation . The Cretaceous was a period with a relatively warm climate, resulting in high Sea level#Local and eustatic, eustatic sea levels that created numerous shallow Inland sea (geology), inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was largely ice-free, although there is some evidence of brief periods of glaciation during the cooler first half, and forests extended to the poles. Many of the dominant taxonomic gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bathymodiolus
''Bathymodiolus'' is a genus of deep-sea mussels, marine bivalve molluscs in the family Mytilidae. Many of them contain intracellular chemoautotrophic bacterial symbionts. Species Modern (non-fossil) species within the genus ''Bathymodiolus'' include: * '' Bathymodiolus childressi'' Gustafson, Lutz, Turner & Vrijenhoek, 1998 * '' Bathymodiolus japonicus'' Hashimoto & Okutani, 1994 * '' Bathymodiolus marisindicus'' Hashimoto, 2001 * '' Bathymodiolus platifrons'' Hashimoto & Okutani, 1994 * '' Bathymodiolus septemdierum'' Hashimoto & Okutani, 1994 * '' Bathymodiolus tangaroa'' Von Cossel & Marshall, 2003 * '' Bathymodiolus thermophilus'' Kenk & Wilson, 1985 * ''Bathymodiolus boomerang'' Cosel & Olu, 1998 There also are several fossil species, which are usually only tentatively assigned to hydrothermal vent Hydrothermal vents are fissures on the seabed from which geothermally heated water discharges. They are commonly found near volcanically active places, areas where tec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vesicomyidae
Vesicomyidae is a family of saltwater clams, marine bivalve molluscs in the superfamily Glossoidea. MolluscaBase eds. (2022). MolluscaBase. Vesicomyidae Dall & Simpson, 1901. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=23140 on 2022-02-01 Genera and species Genera, and some selected species, within the family Vesicomyidae are: ; Subfamily Pliocardiinae Woodring, 1925 * '' Abyssogena'' Krylova, Sahling & R. Janssen, 2010 * '' Archivesica'' Dall, 1908 * '' Austrogena'' Krylova, Sellanes, F. Valdés & D'Elía, 2014 * '' Callogonia'' Dall, 1889 * '' Calyptogena'' Dall, 1891 ** ''Calyptogena magnifica'' ** '' Calyptogena pacifica'' Dall, 1891 * '' Christineconcha'' Krylova & Cosel, 2011 * † '' Cytherocardia'' Sacco, 1900 * '' Ectenagena'' Woodring, 1938 * '' Elenaconcha'' Cosel & Olu, 2009 * † '' Hubertschenckia'' Takeda, 1953 * '' Isorropodon'' Sturany, 1896 * '' Laubiericoncha'' von Cosel & Olu, 2008 ** '' L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
