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Zamites
''Zamites'' is a genus of fossil tree known from the Mesozoic of North America, Europe and India through the Eocene of North America. It was erected as a form taxon for leaves that superficially resembled the extant cycad ''Zamia'', however it is now believed to belong to a similar but phylogenetically different group, the cyacadeoids (Bennettitales). The fronds are linear or lanceolate in shape, and pinnately compound, with pinnae with parallel veins and smooth margins, and symmetrical and constricted at the base where they are attached obliquely to the upper surface of the rachis. It has been interpreted as a Bennettitalean plant in the family Williamsoniaceae. As explained by Zijlstra & van Konijnenburg-van Cittert (2020), the application of the genus name ''Zamites'' has over time drifted away from Brongniart's original concept to one where the species ''Z. gigas'' (Lindl. & Hutton) Morris has been treated as a ''de facto'' type, to the degree that none of Brongniart's four or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zamites Bayeri
''Zamites'' is a genus of fossil tree known from the Mesozoic of North America, Europe and India through the Eocene of North America. It was erected as a form taxon for leaves that superficially resembled the extant cycad ''Zamia'', however it is now believed to belong to a similar but phylogenetically different group, the cyacadeoids ( Bennettitales). The fronds are linear or lanceolate in shape, and pinnately compound, with pinnae with parallel veins and smooth margins, and symmetrical and constricted at the base where they are attached obliquely to the upper surface of the rachis. It has been interpreted as a Bennettitalean plant in the family Williamsoniaceae. As explained by Zijlstra & van Konijnenburg-van Cittert (2020), the application of the genus name ''Zamites'' has over time drifted away from Brongniart's original concept to one where the species ''Z. gigas'' (Lindl. & Hutton) Morris has been treated as a ''de facto'' type, to the degree that none of Brongniart's four ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zamites Mariposana
''Zamites'' is a genus of fossil tree known from the Mesozoic of North America, Europe and India through the Eocene of North America. It was erected as a form taxon for leaves that superficially resembled the extant cycad ''Zamia'', however it is now believed to belong to a similar but phylogenetically different group, the cyacadeoids ( Bennettitales). The fronds are linear or lanceolate in shape, and pinnately compound, with pinnae with parallel veins and smooth margins, and symmetrical and constricted at the base where they are attached obliquely to the upper surface of the rachis. It has been interpreted as a Bennettitalean plant in the family Williamsoniaceae. As explained by Zijlstra & van Konijnenburg-van Cittert (2020), the application of the genus name ''Zamites'' has over time drifted away from Brongniart's original concept to one where the species ''Z. gigas'' (Lindl. & Hutton) Morris has been treated as a ''de facto'' type, to the degree that none of Brongniart's four ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zamites Arcticus
''Zamites'' is a genus of fossil tree known from the Mesozoic of North America, Europe and India through the Eocene of North America. It was erected as a form taxon for leaves that superficially resembled the extant cycad ''Zamia'', however it is now believed to belong to a similar but phylogenetically different group, the cyacadeoids ( Bennettitales). The fronds are linear or lanceolate in shape, and pinnately compound, with pinnae with parallel veins and smooth margins, and symmetrical and constricted at the base where they are attached obliquely to the upper surface of the rachis. It has been interpreted as a Bennettitalean plant in the family Williamsoniaceae. As explained by Zijlstra & van Konijnenburg-van Cittert (2020), the application of the genus name ''Zamites'' has over time drifted away from Brongniart's original concept to one where the species ''Z. gigas'' (Lindl. & Hutton) Morris has been treated as a ''de facto'' type, to the degree that none of Brongniart's four ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zamites Californica
''Zamites'' is a genus of fossil tree known from the Mesozoic of North America, Europe and India through the Eocene of North America. It was erected as a form taxon for leaves that superficially resembled the extant cycad ''Zamia'', however it is now believed to belong to a similar but phylogenetically different group, the cyacadeoids ( Bennettitales). The fronds are linear or lanceolate in shape, and pinnately compound, with pinnae with parallel veins and smooth margins, and symmetrical and constricted at the base where they are attached obliquely to the upper surface of the rachis. It has been interpreted as a Bennettitalean plant in the family Williamsoniaceae. As explained by Zijlstra & van Konijnenburg-van Cittert (2020), the application of the genus name ''Zamites'' has over time drifted away from Brongniart's original concept to one where the species ''Z. gigas'' (Lindl. & Hutton) Morris has been treated as a ''de facto'' type, to the degree that none of Brongniart's four ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bennettitales
Bennettitales (also known as cycadeoids) is an extinct order of seed plants that first appeared in the Permian period and became extinct in most areas toward the end of the Cretaceous. Bennettitales are among the most common Mesozoic seed plants, and had morphologies including shrub and cycad-like forms. The foliage of bennettitaleans is superficially nearly indistinguishable from that of cycads, but they are distinguished from cycads by their more complex flower-like reproductive organs, at least some of which were likely pollinated by insects. Although certainly gymnosperms (cone-bearing seed plants), the relationships of bennettitaleans to other seed plants is debated. Their general resemblance to cycads is contradicted by numerous more subtle features of their reproductive systems and leaf structure. Some authors have linked bennettitaleans to angiosperms (flowering plants) and gnetophytes (a rare and unusual group of modern gymnosperms), forming a broader group known as Anth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valle Alto Formation
The Valle Alto Formation ( es, Formación Valle Alto, Jva) is a geological formation of the Central Ranges of the Colombian Andes. The formation is composed of shales, sandstones and conglomerates and dates to the Late Jurassic period. Ammonites and fossil flora have been found in the Valle Alto Formation. Etymology The formation was described and named in 1977 by González et al. after Hacienda Valle Alto, San Félix, Caldas.Moreno Sánchez et al., 2007Mojica, 1984, p.132 Lithologies The Valle Alto Formation is composed of shales, sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates ...s and conglomerates.Isagen, 2009, p.9 Stratigraphy, age and depositional environment The Valle Alto Formation, part of the Quebradagrande Complex, is not defined as a proper forma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Williamsoniaceae
''Williamsoniaceae'' is a family within the Bennettitales, an extinct group of seed plants within the Cycadophyta subdivision. Members of this family are believed to have been around two meters tall and with widely serrate leaves along a central stem. Reproductive organs of the Williamsoniaceae have varied widely in the fossil record but almost all have been found to be borne on stalks emerging from a ring of leaves. Reproduction This family is different from Cycadeoidaceae by having the presence of cones leaving the major axis and lateral branches associated with a long peduncle covered by bracts. Some of this family reproduce by sporangia and others only produce ovule or pollen Pollen is a powdery substance produced by seed plants. It consists of pollen grains (highly reduced microgametophytes), which produce male gametes (sperm cells). Pollen grains have a hard coat made of sporopollenin that protects the gametophyt ... sacs. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene Plants
The Eocene ( ) Epoch is a geological epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period in the modern Cenozoic Era. The name ''Eocene'' comes from the Ancient Greek (''ēṓs'', "dawn") and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope 13C in the atmosphere was exceptionally low in comparison with the more common isotope 12C. The end is set at a major extinction event called the ''Grande Coupure'' (the "Great Break" in continuity) or the Eocene–Oligocene extinction event, which may be related to the impact of one or more large bolides in Siberia and in what is now Chesapeake Bay. As with other geologic periods, the strata that define the start and end of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleocene Plants
The Paleocene, ( ) or Palaeocene, is a geological epoch that lasted from about 66 to 56 million years ago (mya). It is the first epoch of the Paleogene Period in the modern Cenozoic Era. The name is a combination of the Ancient Greek ''palaiós'' meaning "old" and the Eocene Epoch (which succeeds the Paleocene), translating to "the old part of the Eocene". The epoch is bracketed by two major events in Earth's history. The K–Pg extinction event, brought on by an asteroid impact and possibly volcanism, marked the beginning of the Paleocene and killed off 75% of living species, most famously the non-avian dinosaurs. The end of the epoch was marked by the Paleocene–Eocene Thermal Maximum (PETM), which was a major climatic event wherein about 2,500–4,500 gigatons of carbon were released into the atmosphere and ocean systems, causing a spike in global temperatures and ocean acidification. In the Paleocene, the continents of the Northern Hemisphere were still connected via s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Cretaceous Plants
Late may refer to: * LATE, an acronym which could stand for: ** Limbic-predominant age-related TDP-43 encephalopathy, a proposed form of dementia ** Local-authority trading enterprise, a New Zealand business law ** Local average treatment effect, a concept in econometrics Music * ''Late'' (album), a 2000 album by The 77s * Late!, a pseudonym used by Dave Grohl on his ''Pocketwatch'' album * Late (rapper), an underground rapper from Wolverhampton * "Late" (song), a song by Blue Angel * "Late", a song by Kanye West from ''Late Registration'' Other * Late (Tonga), an uninhabited volcanic island southwest of Vavau in the kingdom of Tonga * "Late" (''The Handmaid's Tale''), a television episode * LaTe, Oy Laivateollisuus Ab, a defunct shipbuilding company * Late may refer to a person who is Dead See also * * * ''Lates'', a genus of fish in the lates perch family * Later (other) * Tardiness * Tardiness (scheduling) In scheduling, tardiness is a measure of a delay in exe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Cretaceous Plants
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Early may refer to: History * The beginning or oldest part of a defined historical period, as opposed to middle or late periods, e.g.: ** Early Christianity ** Early modern Europe Places in the United States * Early, Iowa * Early, Texas * Early Branch, a stream in Missouri * Early County, Georgia Other uses * ''Early'' (Scritti Politti album), 2005 * ''Early'' (A Certain Ratio album), 2002 * Early (name) * Early effect, an effect in transistor physics * Early Records, a record label * the early part of the morning See also * Earley (other) Earley is a town in England. Earley may also refer to: * Earley (surname), a list of people with the surname Earley * Earley (given name), a variant of the given name Earlene * Earley Lake, a lake in Minnesota *Earley parser, an algorithm *Earley ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jurassic Plants
The Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The Jurassic constitutes the middle period of the Mesozoic Era and is named after the Jura Mountains, where limestone strata from the period were first identified. The start of the Jurassic was marked by the major Triassic–Jurassic extinction event, associated with the eruption of the Central Atlantic Magmatic Province. The beginning of the Toarcian Stage started around 183 million years ago and is marked by an extinction event associated with widespread oceanic anoxia, ocean acidification, and elevated temperatures likely caused by the eruption of the Karoo-Ferrar large igneous provinces. The end of the Jurassic, however, has no clear boundary with the Cretaceous and is the only boundary between geological periods to remain formally undefined. By the beginning of the Jurassic, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
