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Gravicalymene Arcuata
''Gravicalymene'' Shirley, 1936, is a genus of trilobites belonging to the order Phacopida, suborder Calymenina and family Calymenidae. Species included in this genus have previously been allocated to ''Calymene'' Brongniart 1822,''Flexicalymene'' Shirley, 1936. and '' Sthenarocalymene'' Siveter 1977. Rarest within the genus is the Middle Ordovician species ''Gravicalymene magnotuberculata'', which is also amongst the rarest of all Calymenidae and regionally confined to two exposures in New York State. ''G. magnotuberculata'' is noted for its extremely pustulose exoskeleton, bell-shaped glabella and lack of complete articulated specimens. Type species * '' Gravicalymene convolva'' Shirley 1936, by original designation. Found only in the Birdshill Limestone (Pusgillian or lowest Cautleyan Stage) at Birdshill Quarry, near Llandeilo, South Wales. Other species Some known species and locations include: * '' Gravicalymene arcuata'' Price, 1982. Rawtheyan Stage, Dolhir Formation, C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emsian
The Emsian is one of three faunal stages in the Early Devonian Epoch. It lasted from 407.6 ± 2.6 million years ago to 393.3 ± 1.2 million years ago. It was preceded by the Pragian Stage and followed by the Eifelian Stage. It is named after the Ems river in Germany. The GSSP is located in the Zinzil'ban Gorge in the Kitab State Geological Reserve of Uzbekistan, above the contact with the Madmon Formation. In North America the Emsian Stage is represented by Sawkill or Sawkillian time. Biological events During this period, earliest known agoniatitid ammonoid fossils began appearing within this stage after first appearing in previous stage and began to evolutionarily radiate within this stage, in which a new ammonoid order Goniatitida rises in the end of Zlichovian stage (Siberian representation; corresponds to early Eifelian and after the end of Early Devonian, before 391.9 mya Mya may refer to: Brands and product names * Mya (program), an intelligent personal as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleozoic Life Of Quebec
The Paleozoic (or Palaeozoic) Era is the earliest of three era (geology), geologic eras of the Phanerozoic Eon. The name ''Paleozoic'' ( ;) was coined by the British geologist Adam Sedgwick in 1838 by combining the Ancient Greek, Greek words ''palaiós'' (, "old") and ''zōḗ'' (), "life", meaning "ancient life" ). It is the longest of the Phanerozoic eras, lasting from , and is subdivided into six period (geology), geologic periods (from oldest to youngest): # Cambrian # Ordovician # Silurian # Devonian # Carboniferous # Permian The Paleozoic comes after the Neoproterozoic Era of the Proterozoic Eon and is followed by the Mesozoic Era. The Paleozoic was a time of dramatic geological, climatic, and evolutionary change. The Cambrian witnessed the most rapid and widespread diversification of life in Earth's history, known as the Cambrian explosion, in which most modern phylum, phyla first appeared. Arthropods, Mollusca, molluscs, fish, amphibians, reptiles, and synapsids all ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonian Extinctions
The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, where rocks from this period were first studied. The first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land, forming extensive forests which covered the continents. By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. The arthropod groups of myriapods, arachnids and hexapods also became well-established early in this period, after starting their expansion to land at least from the Ordovician period. Fish reached substantial diversity during this time, leading the Devonian to often be dubbed the Age of Fishes. The placoderms began dominating ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordovician First Appearances
The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. The Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same rock beds in North Wales in the Cambrian and Silurian systems, respectively. Lapworth recognized that the fossil fauna in the disputed strata were different from those of either the Cambrian or the Silurian systems, and placed them in a system of their own. The Ordovician received international approval in 1960 (forty years after Lapworth's death), when it was adopted as an official period of the Paleozoic Era by the International Geological Congress. Life continued to flourish during the Ordovician as it did in the earlier Cambrian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossils Of The United States
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the abso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silurian Trilobites
The Silurian ( ) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago (Mya), to the beginning of the Devonian Period, Mya. The Silurian is the shortest period of the Paleozoic Era. As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by a few million years. The base of the Silurian is set at a series of major Ordovician–Silurian extinction events when up to 60% of marine genera were wiped out. One important event in this period was the initial establishment of terrestrial life in what is known as the Silurian-Devonian Terrestrial Revolution: vascular plants emerged from more primitive land plants, dikaryan fungi started expanding and diversifying along with glomeromycotan fungi, and three groups of arthropods ( myriapods, arachnids and hexapods) became fully terrestrialized. A significant evolutionary milestone du ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gravicalymene Truncatus
''Gravicalymene'' Shirley, 1936, is a genus of trilobites belonging to the order Phacopida, suborder Calymenina and family Calymenidae. Species included in this genus have previously been allocated to ''Calymene'' Brongniart 1822,''Flexicalymene'' Shirley, 1936. and '' Sthenarocalymene'' Siveter 1977. Rarest within the genus is the Middle Ordovician species ''Gravicalymene magnotuberculata'', which is also amongst the rarest of all Calymenidae and regionally confined to two exposures in New York State. ''G. magnotuberculata'' is noted for its extremely pustulose exoskeleton, bell-shaped glabella and lack of complete articulated specimens. Type species * '' Gravicalymene convolva'' Shirley 1936, by original designation. Found only in the Birdshill Limestone (Pusgillian or lowest Cautleyan Stage) at Birdshill Quarry, near Llandeilo, South Wales. Other species Some known species and locations include: * ''Gravicalymene arcuata'' Price, 1982. Rawtheyan Stage, Dolhir Formation, Cy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trenton Group
The Trenton Group is a limestone geologic group in New York. It preserves fossils dating back to the Ordovician period. See also * List of fossiliferous stratigraphic units in New York This article contains a list of fossil-bearing stratigraphic units in the state of New York, U.S. Sites See also * Paleontology in New York References * {{DEFAULTSORT:Fossiliferous stratigraphic units in New York New York Stratigraph ... References * Geologic groups of New York (state) Limestone formations of the United States Ordovician geology of New York (state) {{NewYork-geologic-formation-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gravicalymene Magnotuberculata
''Gravicalymene'' Shirley, 1936, is a genus of trilobites belonging to the order Phacopida, suborder Calymenina and family Calymenidae. Species included in this genus have previously been allocated to ''Calymene'' Brongniart 1822,''Flexicalymene'' Shirley, 1936. and '' Sthenarocalymene'' Siveter 1977. Rarest within the genus is the Middle Ordovician species ''Gravicalymene magnotuberculata'', which is also amongst the rarest of all Calymenidae and regionally confined to two exposures in New York State. ''G. magnotuberculata'' is noted for its extremely pustulose exoskeleton, bell-shaped glabella and lack of complete articulated specimens. Type species * '' Gravicalymene convolva'' Shirley 1936, by original designation. Found only in the Birdshill Limestone (Pusgillian or lowest Cautleyan Stage) at Birdshill Quarry, near Llandeilo, South Wales. Other species Some known species and locations include: * ''Gravicalymene arcuata'' Price, 1982. Rawtheyan Stage, Dolhir Formation, Cy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tom Baker
Thomas Stewart Baker (born 20 January 1934) is an English actor and writer. He is well known for his portrayal of the fourth incarnation of the Doctor in the science fiction television series '' Doctor Who'' from 1974 to 1981.Scott, Danny. (17 December 2006)"A Life in the Day: Tom Baker" '' The Sunday Times''. Later in his career, Baker performed in the television series '' Medics'' (1992–1995), '' Randall & Hopkirk (Deceased)'' (2000–2001) and '' Monarch of the Glen'' (2004–2005). He also provided narration for the television comedy series '' Little Britain'' (2003–2006) and '' Little Britain USA'' (2008). His voice, which has been described as "sonorous", was voted the fourth-most recognisable in the UK in 2006. Early life Thomas Stewart Baker was born on Scotland Road in the Vauxhall area of Liverpool on 20 January 1934. His mother, Mary Jane (''née'' Fleming), was a cleaner and devout Catholic. His father, John Stewart Baker, was a seaman and largely absent f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
