Conodonts are an extinct class of animals whose feeding apparatuses called teeth or elements are common microfossils found in strata dating from the Stage 10 of the Furongian, the fourth and final series of the Cambrian, to the Rhaetian stage of the Late Triassic. These elements can be used alternatively to or in correlation with other types of fossils ( graptolites , trilobites , ammonites , ...) in the subfield of the stratigraphy named biostratigraphy .
29-458: Boothia may refer to: The Boothia Peninsula , a peninsula in Nunavut, Canada The Gulf of Boothia , a body of water in Nunavut, Canada [REDACTED] Topics referred to by the same term This disambiguation page lists articles about distinct geographical locations with the same name. If an internal link led you here, you may wish to change
58-466: A marker of Stage 10 , the final stage of the Cambrian. In 2006, a working group proposed the first appearance of Cordylodus andresi . Currently the first appearance of E. notchpeakensis is favored by many authors because it is globally widespread and is independent of facies (known from continental rise to peritidal environments). The Eoconodontus notchpeakensis proposal would also incorporate
87-529: A non-biostratigraphic marker to correlate the beginning of Stage 10 globally. A carbon isotope excursion (the HERB-event) occurs in the lower part of the E. notchpeakensis range. Prooneotodus rotundatus Westergaardodina ani Westergaardodina grandidens Hunanognathus tricuspidatus Westergaardodina brevidens The base of the Tremadocian , the lowest stage of Ordovician , is defined as
116-454: Is a large peninsula in Nunavut 's northern Canadian Arctic , south of Somerset Island . The northern part, Murchison Promontory , is the northernmost point of mainland Canada. Bellot Strait (Ikirahaq) separates the peninsula from Somerset Island to the north. Babbage Bay is on the east coast, as is Abernethy Bay, just to the south. The community of Taloyoak lies in the far south and
145-701: Is defined as ending near the lowest occurrences of Chiosella timorensis . The base of the Anisian stage (also the base of the Middle Triassic series) is sometimes laid at the first appearance of Chiosella timorensis in the stratigraphic record. The top of the Anisian (the base of the Ladinian) is at the first appearance of Neogondolella praehungarica . The Ladinian is defined by the first appearance of Budurovignathus praehungaricus . The top of
174-525: Is defined as the place in the stratigraphic record where fossils of Jinogondolella nankingensis first appears. The top of the Roadian (the base of the Wordian stage) is at the first appearance of fossils of Jinogondolella aserrata . The base of the Wordian stage is defined as the place in the stratigraphic record where fossils of Jinogondolella aserrata first appear. The top of the Wordian (the base of
203-594: Is defined by a GSSP Golden Spike located at Coumiac quarry , Montagne Noire, France where there is a biologic abundant occurrence of Palmatolepis triangularis . The Tournaisian , the oldest age of the Mississippian contains eight conodont biozones: The Visean , the second age of the Mississippian, contains four conodont biozones: The Serpukhovian , the third or youngest age of the Mississippian, includes four conodont biozones: The Bashkirian ,
232-750: Is defined by the potentially lowest occurrence of the conodont Protoprioniodus aranda or Baltoniodus triangularis . No conodont species is associated with the Sandbian , the Katian , nor with the Hirnantian , the fifth, sixth and seventh and final stages of the Ordovician. Baltoniodus gerdae has been found in the early Sandbian Bromide Formation , in Oklahoma, United States. The Llandovery epoch lasted from 443.8 ± 1.5 to 433.4 ± 2.8 mya, and
261-662: Is subdivided into the Sheinwoodian (to 430.5 million years ago) and Homerian ages. The Sheinwoodian (Wenlock) is defined between the acritarch biozone 5 and the last appearance of Pterospathodus amorphognathoides . The global boundary stratotype point is in Hughley Brook in Apedale, U.K. The Ludlow, lasting from 427.4 ± 1.5 to 423 ± 2.8 mya, comprises the Gorstian stage, lasting until 425.6 million years ago, and
290-626: Is subdivided into three stages: the Rhuddanian , lasting until 440.8 million years ago, the Aeronian, lasting to 438.5 million years ago, and the Telychian. The Telychian (Late Llandovery) of Estonia can be defined by five conodont zones ( Pterospathodus eopennatus ssp. n. 1 , P. eopennatus ssp. n. 2 , P. amorphognathoides angulatus , P. a. lennarti and P. a. lithuanicus ). The Wenlock, which lasted from 433.4 ± 1.5 to 427.4 ± 2.8 mya,
319-599: Is the peninsula's only significant population centre. Paisley Bay is on the west coast, as is Wrottesley Inlet (between Paisley Bay and Bellot Strait). Prior to the detachment of Nunavut in 1999, the Boothia Peninsula and the nearby Melville Peninsula were the only parts of mainland Canada that belonged to the District of Franklin in the then Northwest Territories . The balance of the District of Franklin
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#1732798807320348-641: The Artinskian stage is defined as the place in the stratigraphic record where fossils of Sweetognathus whitei and Mesogondolella bisselli first appear. The top of the Artinskian (the base of the Kungurian) is defined as the place in the stratigraphic record where fossils of Neostreptognathodus pnevi and Neostreptognathodus exculptus first appear. The base of the Kungurian stage is defined as
377-665: The Carnian (the base of the Norian) is at the conodont biozones of Metapolygnathus communisti or Metapolygnathus primitius . The Norian stage begins at the base of the conodont biozones of Metapolygnathus communisti and Metapolygnathus primitius . The top of the Norian (the base of the Rhaetian ) is close to the first appearance of Misikella spp. and Epigondolella mosheri . The Alaunian , also known as "Middle Norian ",
406-668: The Kasimovian , the third stage in the Pennsylvanian, is close to the first appearance of the conodont Streptognathodus zethus . The Kasimovian is subdivided into three conodont biozones: The base of the Gzhelian , the youngest age of the Pennsylvanian, is at the first appearance of Streptognathodus zethus . The top of the stage (the base of the Permian system) is at the first appearance of Streptognathodus isolatus within
435-599: The Northwest Passage passed through the Bellot Strait. Larsen deemed the strait too shallow for larger vessels and described how his vessel was almost crushed by ice floes when there was a change in the wind's direction. On his return voyage Larsen passed north of Somerset Island. 71°N 94°W / 71°N 94°W / 71; -94 Conodont biostratigraphy It has been suggested that Eoconodontus notchpeakensis can be
464-655: The Streptognathus "wabaunsensis" chronocline. The Gzhelian stage is subdivided into five biozones, based on the conodont genus Streptognathodus : The base of the Asselian stage is at the same time the base of the Cisuralian series and the Permian system. It is defined as the place in the stratigraphic record where fossils of Streptognathodus isolatus first appear. The top of the Asselian stage (the base of
493-778: The Wuchiapingian stage is defined as the place in the stratigraphic record where Clarkina postbitteri postbitteri first appears. The top of the Wuchiapingian (the base of the Changhsingian) is at the first appearance of conodont species Clarkina wangi . The base of the Changhsingian stage is at the first appearance of Clarkina wangi . The top of the Changhsingian (the base of the Induan stage and
522-641: The Capitanian stage) is defined as the place in the stratigraphic record where Jinogondolella postserrata first appears. The base of the Capitanian stage is defined as the place in the stratigraphic record where fossils of Jinogondolella postserrata first appear. The top of the Capitanian (the base of the Wuchiapingian and Lopingian series) is defined as the place in the stratigraphic record where Clarkina postbitteri postbitteri first appears. The Capitanian contains three conodont biozones: The base of
551-700: The Late Devonian starts with the Frasnian, 382.7 ± 2.8 to 372.2 ± 2.5, followed by the Famennian subdivision, the beginning and end of which are marked with extinction events. This lasted until the end of the Devonian, 358.9± 2.5 million years ago. During that stage, a biologic event occurred (Upper Kellwasser Extinction of all Ancyrodella and Ozarkodina and most Palmatolepis , Polygnathus and Ancyrognathus ). The Famennian (372.2 ± 1.6 mya)
580-835: The Ludfordian stage. The Early Devonian lasts from 419.2 ± 2.8 to 393.3 ± 2.5 and begins with the Lochkovian stage, which lasts until the Pragian. This spans from 410.8 ± 2.8 to 407.6 ± 2.5, and is followed by the Emsian, which lasts until the Middle Devonian begins, 393.3± 2.7 million years ago. The Middle Devonian comprises two subdivisions, the Eifelian giving way to the Givetian 387.7± 2.7 million years ago. Finally,
609-662: The North Atlantic Microzarkodina parva conodont zone. The base also lies in the upper part of the North American Histiodella altifrons conodont zone. The Whiterock Stage refers mainly to the early Middle Ordovician in North America. It is often used in the older literature in a global sense. The Whiterock Stage is given a range from 471.8 (ca. 472) to 462 m.y.a., spanning close to 10 million years. Officially its start
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#1732798807320638-647: The Sakmarian stage) is at the first appearance of conodont species Streptognathodus postfusus . The Asselian contains five conodont biozones: The base of the Sakmarian stage is laid with the first appearance of Streptognathodus postfusus in the fossil record. The top of the Sakmarian (the base of the Artinskian) is defined as the place in the stratigraphic record where fossils of Sweetognathus whitei and Mesogondolella bisselli first appear. The base of
667-690: The Triassic system) is at the first appearance of Hindeodus parvus . The base of the Induan stage (which is also the base of the Lower Triassic series, the base of the Triassic system and the base of the Mesozoic erathem) is defined as the place in the fossil record where Hindeodus parvus first appears. The base of the Olenekian is at the lowest occurrence of Neospathodus waageni . It
696-681: The first appearance of Iapetognathus fluctivagus at the GSSP section in Newfoundland. No conodont species is associated with the Floian , the second stage of the Ordovician. The base of the Dapingian , the third stage of the Ordovician, is defined as the first appearance of Baltoniodus triangularis . The base of the Darriwilian , the fourth stage of the Ordovician, lies just above
725-487: The link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Boothia&oldid=932731392 " Category : Place name disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Boothia Peninsula Boothia Peninsula ( / ˈ b uː θ i ə / ; formerly Boothia Felix , Inuktitut Kingngailap Nunanga )
754-684: The oldest age of the Pennsylvanian , contains six biozones based on conodont index fossils : The base of the Moscovian , the second stage in the Pennsylvanian, is close to the first appearances of the conodonts Declinognathodus donetzianus and Idiognathoides postsulcatus . A proposal is to use the first appearance of the conodont Diplognathodus ellesmerensis , but since the species is rare and its evolution relatively unknown, it has not been accepted yet. The Moscovian can biostratigraphically be divided into five conodont biozones: The top of
783-572: The place in the stratigraphic record where fossils of Neostreptognathodus pnevi and Neostreptognathodus exculptus first appear. The top of the Kungurian (the base of the Roadian and the Guadalupian series) is defined as the place in the stratigraphic record where fossils of Jinogondolella nanginkensis first appear. The Kungurian contains three conodont biozones: The base of the Roadian
812-778: Was all situated within the Arctic Archipelago . On the peninsula there are outcrops of Early Ordovician rocks, over which Late Ordovician and Silurian rocks are identified ( Middle Ordovician is not exposed). Over 1000 conodont fossils of 37 species in 28 genera were collected from these strata. Genera include Teridontus , Cordylodus , Rossodus , Variabiloconus , Semiacontiodus , Drepanoistodus , Parapanderodus , Ulrichodina , Acodus , Colaptoconus , Polyplacognathus , Pteracontiodus , Milaculum and Phosphannulus . Conodont zones are distinguished in Lower and Upper Ordovician. John Ross
841-566: Was forced by ice to stop for four years at its easternmost point starting in 1829. He named it after his patron Sir Felix Booth . Ross encountered a large Inuit community whom he described as living in "snow cottages" (i.e., igloos ) and immortalized in Ross's painting North Hendon . In 1831, his nephew James Clark Ross went overland and reached the north magnetic pole which was then on its western side. He also crossed west to King William Island . Henry Larsen 's second successful traverse of
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