Clavagella Liratum

	Clavagella Liratum ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: ''Clavagella (Bryopa)'' (Gray 1847) ''Clavagella (Clavagella)'' Blainville 1817 ''Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 '' Clavagella liratum'' (Tate, 1887) '' Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Henri Marie Ducrotay De Blainville Henri Marie Ducrotay de Blainville (; 12 September 1777 – 1 May 1850) was a French zoologist and anatomist. Life Blainville was born at Arques, near Dieppe. As a young man he went to Paris to study art, but ultimately devoted himself to natural history. He attracted the attention of Georges Cuvier, for whom he occasionally substituted as lecturer at the Collège de France and at the Athenaeum Club, London. In 1812 he was aided by Cuvier in acquiring the position of assistant professor of anatomy and zoology in the Faculty of Sciences at Paris. Eventually, relations between the two men soured, a situation that ended in open enmity. In 1819, Blainville was elected a member of the American Philosophical Society in Philadelphia. In 1825 he was admitted a member of the French Academy of Sciences; and in 1830 he was appointed to succeed Jean-Baptiste Lamarck in the chair of natural history at the museum. Two years later, on the death of Cuvier, he obtained the chair of comparative a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Bivalves Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bivalves have no head and they lack some usual molluscan organs, like the radula and the odontophore. They include the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into ctenidia, specialised organs for feeding and breathing. Most bivalves bury themselves in sediment, where they are relatively safe from predation. Others lie on the sea floor or attach themselves to rocks or other hard surfaces. Some bivalves, such as the scallops and file shells, can swim. The shipworms bore into wood, clay, or stone and live inside these substances. The shell of a bivalve is composed of calc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagellidae Clavagellidae is a family of very unusual marine bivalves of the order Anomalodesmata. Genera and species * †'' Ascaulocardium'' Pojeta and N. F 1987 * '' Brechites'' Guettard 1770 '' Brechites attrahens'' '' Brechites brechites'' '' Brechites dichotomus'' '' Brechites giganteus'' '' Brechites javanus'' '' Brechites penis'' (Linnaeus, 1758) '' Brechites philippinensis'' ( Chenu, 1842) '' Brechites pulchrum'' '' Brechites pyriformis'' '' Brechites radix'' (Gray, 1858) '' Brechites ramosus'' '' Brechites sparsus'' '' Brechites strangulatus'' '' Brechites vaginiferus'' (Lamarck Jean-Baptiste Pierre Antoine de Monet, chevalier de Lamarck (1 August 1744 – 18 December 1829), often known simply as Lamarck (; ), was a French naturalist, biologist, academic, and soldier. He was an early proponent of the idea that biolo ..., 1818) ** '' Brechites veitchi'' * '' Clavagella'' Blainville 1817 * '' Humphreyia'' Gray 1858 * '' Penicil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagella (Bryopa) ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: '' Clavagella (Bryopa)'' (Gray 1847) '' Clavagella (Clavagella)'' Blainville 1817 '' Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 '' Clavagella liratum'' (Tate, 1887) '' Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagella (Clavagella) ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: ''Clavagella (Bryopa)'' (Gray 1847) '' Clavagella (Clavagella)'' Blainville 1817 '' Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 '' Clavagella liratum'' (Tate, 1887) '' Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagella (Dacosta) ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: ''Clavagella (Bryopa)'' (Gray 1847) ''Clavagella (Clavagella)'' Blainville 1817 '' Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 '' Clavagella liratum'' (Tate, 1887) '' Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagella Liratum ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: ''Clavagella (Bryopa)'' (Gray 1847) ''Clavagella (Clavagella)'' Blainville 1817 ''Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 '' Clavagella liratum'' (Tate, 1887) '' Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagella Melitensis ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: ''Clavagella (Bryopa)'' (Gray 1847) ''Clavagella (Clavagella)'' Blainville 1817 ''Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 ''Clavagella liratum'' (Tate, 1887) '' Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve gen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagella Primigenia ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: ''Clavagella (Bryopa)'' (Gray 1847) ''Clavagella (Clavagella)'' Blainville 1817 ''Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 ''Clavagella liratum'' (Tate, 1887) ''Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve gene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Campanian The Campanian is the fifth of six ages of the Late Cretaceous Epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stages in the Upper Cretaceous Series. Campanian spans the time from 83.6 (± 0.2) to 72.1 (± 0.2) million years ago. It is preceded by the Santonian and it is followed by the Maastrichtian. The Campanian was an age when a worldwide sea level rise covered many coastal areas. The morphology of some of these areas has been preserved: it is an unconformity beneath a cover of marine sedimentary rocks. Etymology The Campanian was introduced in scientific literature by Henri Coquand in 1857. It is named after the French village of Champagne in the department of Charente-Maritime. The original type locality was a series of outcrop near the village of Aubeterre-sur-Dronne in the same region. Definition The base of the Campanian Stage is defined as a place in the stratigraphic column wher ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Maastrichtian The Maastrichtian () is, in the ICS geologic timescale, the latest age (uppermost stage) of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and of the Mesozoic Era or Erathem. It spanned the interval from . The Maastrichtian was preceded by the Campanian and succeeded by the Danian (part of the Paleogene and Paleocene). The Cretaceous–Paleogene extinction event (formerly known as the Cretaceous–Tertiary extinction event) occurred at the end of this age. In this mass extinction, many commonly recognized groups such as non-avian dinosaurs, plesiosaurs and mosasaurs, as well as many other lesser-known groups, died out. The cause of the extinction is most commonly linked to an asteroid about wide colliding with Earth, ending the Cretaceous. Stratigraphic definitions Definition The Maastrichtian was introduced into scientific literature by Belgian geologist André Hubert Dumont in 1849, after studying rock strata of the Chalk Group c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]

	Clavagella Liratum ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: ''Clavagella (Bryopa)'' (Gray 1847) ''Clavagella (Clavagella)'' Blainville 1817 ''Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 '' Clavagella liratum'' (Tate, 1887) '' Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Henri Marie Ducrotay De Blainville Henri Marie Ducrotay de Blainville (; 12 September 1777 – 1 May 1850) was a French zoologist and anatomist. Life Blainville was born at Arques, near Dieppe. As a young man he went to Paris to study art, but ultimately devoted himself to natural history. He attracted the attention of Georges Cuvier, for whom he occasionally substituted as lecturer at the Collège de France and at the Athenaeum Club, London. In 1812 he was aided by Cuvier in acquiring the position of assistant professor of anatomy and zoology in the Faculty of Sciences at Paris. Eventually, relations between the two men soured, a situation that ended in open enmity. In 1819, Blainville was elected a member of the American Philosophical Society in Philadelphia. In 1825 he was admitted a member of the French Academy of Sciences; and in 1830 he was appointed to succeed Jean-Baptiste Lamarck in the chair of natural history at the museum. Two years later, on the death of Cuvier, he obtained the chair of comparative a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Bivalves Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bivalves have no head and they lack some usual molluscan organs, like the radula and the odontophore. They include the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into ctenidia, specialised organs for feeding and breathing. Most bivalves bury themselves in sediment, where they are relatively safe from predation. Others lie on the sea floor or attach themselves to rocks or other hard surfaces. Some bivalves, such as the scallops and file shells, can swim. The shipworms bore into wood, clay, or stone and live inside these substances. The shell of a bivalve is composed of calc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagellidae Clavagellidae is a family of very unusual marine bivalves of the order Anomalodesmata. Genera and species * †'' Ascaulocardium'' Pojeta and N. F 1987 * '' Brechites'' Guettard 1770 '' Brechites attrahens'' '' Brechites brechites'' '' Brechites dichotomus'' '' Brechites giganteus'' '' Brechites javanus'' '' Brechites penis'' (Linnaeus, 1758) '' Brechites philippinensis'' ( Chenu, 1842) '' Brechites pulchrum'' '' Brechites pyriformis'' '' Brechites radix'' (Gray, 1858) '' Brechites ramosus'' '' Brechites sparsus'' '' Brechites strangulatus'' '' Brechites vaginiferus'' (Lamarck Jean-Baptiste Pierre Antoine de Monet, chevalier de Lamarck (1 August 1744 – 18 December 1829), often known simply as Lamarck (; ), was a French naturalist, biologist, academic, and soldier. He was an early proponent of the idea that biolo ..., 1818) ** '' Brechites veitchi'' * '' Clavagella'' Blainville 1817 * '' Humphreyia'' Gray 1858 * '' Penicil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagella (Bryopa) ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: '' Clavagella (Bryopa)'' (Gray 1847) '' Clavagella (Clavagella)'' Blainville 1817 '' Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 '' Clavagella liratum'' (Tate, 1887) '' Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagella (Clavagella) ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: ''Clavagella (Bryopa)'' (Gray 1847) '' Clavagella (Clavagella)'' Blainville 1817 '' Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 '' Clavagella liratum'' (Tate, 1887) '' Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagella (Dacosta) ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: ''Clavagella (Bryopa)'' (Gray 1847) ''Clavagella (Clavagella)'' Blainville 1817 '' Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 '' Clavagella liratum'' (Tate, 1887) '' Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagella Liratum ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: ''Clavagella (Bryopa)'' (Gray 1847) ''Clavagella (Clavagella)'' Blainville 1817 ''Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 '' Clavagella liratum'' (Tate, 1887) '' Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagella Melitensis ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: ''Clavagella (Bryopa)'' (Gray 1847) ''Clavagella (Clavagella)'' Blainville 1817 ''Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 ''Clavagella liratum'' (Tate, 1887) '' Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve gen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Clavagella Primigenia ''Clavagella'' is a genus of marine bivalves in the family Clavagellidae. Taxonomy Subgenera: ''Clavagella (Bryopa)'' (Gray 1847) ''Clavagella (Clavagella)'' Blainville 1817 ''Clavagella (Dacosta)'' Gray 1858 Species: †''Clavagella elegans'' Müller, 1859 ''Clavagella liratum'' (Tate, 1887) ''Clavagella melitensis'' '' Clavagella primigenia'' Deshayes 1857 Fossil species The genus is also represented in the fossil record. ''Clavagella elegans'' is from the Campanian-Maastrichtian (Upper Cretaceous) of Tinrhert in the Sahara province of Algeria. The type specimen (number MNHN.F.R53841) is kept at the Museum National d'Histoire Naturelle The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loca ... in Paris. References External links Clavagellidae Bivalve gene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Campanian The Campanian is the fifth of six ages of the Late Cretaceous Epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stages in the Upper Cretaceous Series. Campanian spans the time from 83.6 (± 0.2) to 72.1 (± 0.2) million years ago. It is preceded by the Santonian and it is followed by the Maastrichtian. The Campanian was an age when a worldwide sea level rise covered many coastal areas. The morphology of some of these areas has been preserved: it is an unconformity beneath a cover of marine sedimentary rocks. Etymology The Campanian was introduced in scientific literature by Henri Coquand in 1857. It is named after the French village of Champagne in the department of Charente-Maritime. The original type locality was a series of outcrop near the village of Aubeterre-sur-Dronne in the same region. Definition The base of the Campanian Stage is defined as a place in the stratigraphic column wher ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Maastrichtian The Maastrichtian () is, in the ICS geologic timescale, the latest age (uppermost stage) of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and of the Mesozoic Era or Erathem. It spanned the interval from . The Maastrichtian was preceded by the Campanian and succeeded by the Danian (part of the Paleogene and Paleocene). The Cretaceous–Paleogene extinction event (formerly known as the Cretaceous–Tertiary extinction event) occurred at the end of this age. In this mass extinction, many commonly recognized groups such as non-avian dinosaurs, plesiosaurs and mosasaurs, as well as many other lesser-known groups, died out. The cause of the extinction is most commonly linked to an asteroid about wide colliding with Earth, ending the Cretaceous. Stratigraphic definitions Definition The Maastrichtian was introduced into scientific literature by Belgian geologist André Hubert Dumont in 1849, after studying rock strata of the Chalk Group c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]