, now part of a Laurentia block, was joined to Rodinia , 750 Ma Baltica The Baltica Laurentia block, AKA Proto Laurasia , was shaved off the splitup Rodinia, 550 Ma Baltica Proto Laurasia broke apart ... more details
multipliers Ma , most continental mass was united in the supercontinent Rodinia . ref name Stanley 336 See Stanley 1999 , pp 336 337 for an overview of different reconstructions of Rodinia, see Torsvik 2003 ref Rodinia was not the first supercontinent it formed at about 1.0 Year SI prefix ... for a pre Rodinia supercontinent journal Earth Science Reviews volume 59 pages 125 162 accessdate ... have been active during the Proterozoic. After the break up of Rodinia about 800 Year SI prefix ... more details
Ma. The Centralian Superbasin formed the junction of the North, South and West cratons. Rodinia broke up between 830 to 745 Ma at around 750 Ma the western side of Rodinia called Laurentia broke away ... Australia, notably at a site known as Wilpena Pound . Gondwana Following the breakup of Rodinia Australia ... around 330 Ma. The continents that had drifted apart from Rodinia drifted together again during the Paleozoic ... more details
bibcode 2004ESRv...67...91Z ref The supercontinent Rodinia formed about 1.1 billion years ago and broke ... now located in the southern hemisphere. Plate tectonics brought the fragments of Rodinia back together ... more details
geology accretion of blocks and terrane s in the aftermath of the breakup of Rodinia when Sao Francisco .... http www.brazadv.com images brasiliano pan african.pdf From Rodinia to Western Gondwana An approach ... more details
Geological era The Neoproterozoic Era is the unit of geologic time scale geologic time from 1,000 to 542.0 1.0 million years ago . ref name Ogg2008 Ogg 2008. ref The terminal Era of the formal Proterozoic Eon or the informal Precambrian , it is further subdivided into the Tonian , Cryogenian , and Ediacaran Periods. The most severe glaciation known in the geologic record occurred during the Cryogenian, when ice sheets reached the equator and formed a possible Snowball Earth . The earliest fossils of metazoa multicellular life are found in the Ediacaran , including the earliest animal s. Geology At the onset of the Neoproterozoic the supercontinent Rodinia , which had assembled during the late Mesoproterozoic , straddled the equator. During the Tonian , rifting commenced which broke Rodinia into a number of individual land masses. Possibly as a consequence of the low latitude position of most continents, several large scale glacial events occurred during the Neoproterozoic Era including the Sturtian and Marinoan glaciations of the Cryogenian. These glaciations are believed to have been so severe that there were ice sheets at the equator a state known as the Snowball Earth . Subdivisions The Russians divide the Siberian Neoproterozoic into the anchor Baikalian Baikalian from 850 to 650Ma loosely equivalent to the Cryogenian , which overlies the anchor Mayanian Mayanian , from 1000 to 850Ma, then the anchor Aimchanian Aimchanian . ref name Khomentovsky2008 cite journal doi 10.1016 j.rgg.2007.12.001 title Mayanian 1100 850 Ma Prebaikalian Upper Riphean of Siberia year 2008 author Khomentovsky, V journal Russian Geology and Geophysics volume 49 issue 1 pages 1 last2 Nagovitsin first2 K last3 Postnikov first3 A bibcode 2008RuGG...49....1K ref Paleobiology main Ediacaran biota The idea of the Neoproterozoic Era came on the scene relatively recently &mdash after about 1960. Nineteenth century paleontologists set the start of metazoan multicelled life at the first appearance ... more details
Other uses Atlantica disambiguation File Atlantica 2Ga.svg thumb Atlantica at about 2 Ga. Archean cratons in grey. Atlantica lang gr Atlantika is the name given to an ancient continent that formed during the Proterozoic about mya 2000 two billion years ago, Year SI prefix multipliers Ga from various 2 Ga craton s located in what is now West Africa and eastern South America . ref name Rogers 1996 harvnb Rogers 1996 ref The name, introduced by harvnb Rogers 1996 , was chosen because the continent opened up to form the South Atlantic Ocean . ref name Sankaran 2003 harvnb Sankaran 2003 p 1122 ref Formation According to harvnb Rogers 1996 , Atlantica formed simultaneously with Nena supercontinent Nena at about 1.9 Ga from Archaean cratons, including Amazonia in present day South America, and the Congo, West Africa and North Africa Cratons in Africa. ref harvnb Yoshida Windley Dasgupta 2003 p 16 ref Breakup File Positions of ancient continents, 550 million years ago.jpg thumb Reconstruction of Earth 550 Ma ago showing the cratons of Atlantica forming West Gondwana Atlantica separated from Nena between 1.6 1.4 Ga when Columbia supercontinent Columbia a supercontinent composed of Ur continent Ur , Arctica , Nena, and Atlantica fragmented. ref name Sankaran 2003 Together with continents Nena and Ur and some minor plates, Atlantica formed the supercontinent Rodinia about 1 Ga ago. The rifting of Rodinia between 1 0.5 Ga resulted in the formation of three new continents Laurasia and East and West Gondwana , of which Atlantica became the nucleus of the latter. ref name Rogers 1996 During this later stage, the Neoproterozoic era, a Brasiliano Pan African Orogeny orogenic system developed. The central part of this system, the Ara ua West Congo orogen, has left a distinct pattern of deformations, still present on both sides of the Atlantic. ref harvnb Alkmim Marshak Pedrosa Soares Peres 2006 loc Abstract harvnb Noce Pedrosa Soares da Silva Armstrong 2007 p 60 ... more details
, tilted, and then eroded during the Grenville orogeny, when the Rodinia supercontinent came together with the Australian subcontinent juxtaposed to what s now Arizona . When Rodinia separated and Australia ... more details
that had formed the Rodinia super continent come together in a completely new arrangement into the Gondwana ... as an intact unit during the break up of Rodinia between 1000 Ma and 700 Ma, and during the subsequent ... more details
In geology , an aulacogen is a failed arm of a triple junction of a plate tectonics rift geology rift system. A triple junction beneath a continental plate initiates a three way breakup of the continental plate. As the continental break up develops one of the three spreading ridges typically fails or stops spreading. The resulting failed rift is called an aulacogen and becomes a filled graben system within the continent. The term aulacogen is derived from the Greek aulax furrow and was suggested by the Soviet geologist Nicholas Shatski in 1946. ref name Shatski Nicholas S. Shatski, 1946, The Great Donets basin and the Wichita System comparative tectonics of ancient platforms Akademiia Nauk SSSR Doklady, Geology Series, No. 6, p. 57 90. ref ref http arjournals.annualreviews.org doi abs 10.1146 annurev.ea.05.050177.002103 Aulacogens and Continental Breakup ref The crust in an aulacogen region remains weakened by previous rifting activity and thus seismic activity and, occasionally, volcanic activity may re occur subsequently from time to time. As aulacogens remain places of weakness, given the appropriate conditions, they can reactivate into active rift valleys again, as had happened to the Ottawa Bonnechere Graben in Ontario and Quebec , Canada , an ancient aulacogen that reactivated during the breakup of Pangaea . The Mississippi embayment with the associated New Madrid Seismic Zone is an example of an ancient aulacogen that dates back to the breakup of the ancient continent, Rodinia . This ancient rift was the site of 1812 New Madrid earthquake extreme earthquakes in the early 19th century in the region. The Southern Oklahoma Aulogen, exposed in the Wichita Mountains , is an Cambrian Eocambrian rift system formed as a product of intracontinetal rifting during the breakup of Pannotia . The Rio Grande Rift is another example. Located on the Southwestern European margin offshore Portugal is another abandoned rift, the Geology of the Iberian Peninsula Lusitanian Basin ... more details
later become Gondwana together formed the supercontinent Rodinia . The exact configuration in which ... different models for the configuration of Rodinia ref It is however clear that intracratonic basin s had ... million years ago , a first sign of continental break up other parts of Rodinia probably rifted off ... Rodinia revisited , Tectonophysics 375 , pp. 261 288. aut Stanley, S.M. 1999 Earth System History ... more details
implications for a pre Rodinia supercontinent. Earth Science Reviews , v. 59, p. 125 162 ref The cratonic .... year 2002 title Review of global 2.1 1.8 Ga orogens implications for a pre Rodinia supercontinent ... of Rodinia . This configuration is based on the available geological reconstructions of 2.1 ... more details
File Land hemisphere.png 180px right Land hemisphere The land hemisphere , sometimes capitalised as the Land Hemisphere , is the hemisphere on the Earth containing the largest possible area of land. It is centered on coord 47.411667 2.620833 type city region FR scale 10000 format dec display inline in le Dumet near Saint Nazaire , France ref cite journal first Alphonse last Berget title R partition g ographique des Oc ans d termination du p le continental publisher Annales de l Institut oc anographique language french year 1913 volume V series 10 url http www.archive.org stream annalesdelinstit05instuoft page n587 mode 2up ref ref fr http www.france secret.com dumet art.htm L le Dumet le nombril du monde ref or on Coord 47 13 N 1 32 W in the city of Nantes , France . ref name Boggs cite journal last Boggs first Samuel Whittemore year 1945 month December title This Hemisphere journal Journal of Geography volume 44 issue 9 pages 345 355 doi 10.1080 00221344508986498 ref The other half of the Earth is the water hemisphere . The land hemisphere has just under seven eighths of the landform land on the Earth, including Europe , Africa , North America , nearly all of Asia and most of South America . Europe is at the center of the land hemisphere. However, even in the land hemisphere, the ocean area still exceeds the land area albeit, only slightly . Thus, there is currently no hemisphere of Earth where the land area is larger than the ocean area. 29.2 of the Earth s surface is currently dry land, ref name Pidwirny Pidwirny, Michael 2006 The Greenhouse Effect . Fundamentals of Physical Geography, 2nd Edition ref so should more than 85.6 of that land be covered by a single hemisphere, that hemisphere would be predominantly land. Previous supercontinents , such as Rodinia , likely represented land dominated hemispheres. Panorama image File Land hemisphere.jpg height 230 caption Panorama of the centre of the land hemisphere, according to the measurement which places it withi ... more details
I have copy and pasted these three article into my user page Supercontinent section , List of supercontinents and Supercontinent cycle . The new and improved lol article will be name Supercontinent . When I am finished, I will move the new Supercontinent article to Wikipedia. This process takes me a month or two. User Bettymnz4 Bettymnz4 User talk Bettymnz4 talk 22 34, 5 April 2010 UTC Unreferenced list date January 2009 This is a list of supercontinent supercontinents . The list is written in reverse chronological order stratolithic order comprising nearly all land at the time. Present day Afro Eurasia 5 mya present day Americas America 15 mya present day Eurasia 60 mya present day Beringia dependent Eurasia North America 55 mya end of last glacial maximum Eurasia America North and South 15 mya end of last glacial maximum Afro Eurasia America Afro Eurasia America 5 mya end of last glacial maximum fossil evidence indicates intermittent existence from 55 mya, now dependent on sea level. Prehistoricals Gondwana 300 30 million years ago Laurasia 300 60 million years ago Pangaea 300 180 million years ago Euramerica 300 million years ago Oldredia 418 380 million years ago Pannotia , also called Vendian 600 540 million years ago Rodinia 1.1 Giga annum Ga 750 million years ago Columbia supercontinent Columbia , also called Nuna 1.8 1.5 Ga ago Nena supercontinent Nena 1.8 Ga Kenorland 2.7 Ga ago . Neoarchean sanukitoid cratons and new continental crust formed Kenorland. Protracted tectonic magna plume rifting occurred 2.48 to 2.45 Ga and this contributed to the Paleoproterozoic glacial events in 2.45 to 2.22 Ga. Final breakup occurred 2.1 Ga. Ur continent Ur 3 Ga ago . Classified as the earliest known landmass. Ur, however, was probably the largest, perhaps even the only continent three billion years ago. While probably not a supercontinent, one can argue that Ur was a supercontinent for its time, even if it was smaller than Australia continent Australia is today. Still, an ... more details
to have been one of the cratons that came together to form Rodinia , a supercontinent . At that time ... Earth Geography Rodinia.htm title Rodinia publisher Palaeos Toby White accessdate 2009 03 15 ref Around 750 million years ago Rodinia rift geology rifted apart into three continents Proto Laurasia , the Congo craton and Proto Gondwana . ref aut Torsvik, T.H. 2003 The Rodinia Jigsaw Puzzle ... more details
. This hypothesis stated that following the breakup of the early equatorial supercontinent Rodinia ... . Zipper rift A tectonic model for Neoproterozoic glaciations during the breakup of Rodinia after ... more details
evolution of the Paleo Asian Ocean implications to the break up of Rodinia. Gondwana Research ... in the Tuva Mongol massif Siberia Island arc continent collision at the northeast Rodinia margin ... more details
Geological era The Mesoproterozoic Era is a geology geologic era geology era that occurred between 1600 Ma and 1000 annum Ma million years ago . The Mesoproterozoic was the first period of Earth s history with a respectable geological record. Continents existed in the Paleoproterozoic , but we know little about them. The continental masses of the Mesoproterozoic are more or less the same ones that are with us today. The major events of this era are the formation of the Rodinia supercontinent , the breakup of the Columbia supercontinent Columbia supercontinent , and the evolution of sexual reproduction . This era is marked by the further development of continental plates and plate tectonics. At the end of this era, the continental plates that had developed were more or less the same we have today. This is the first era of which a good geological record still exists today. The first large scale mountain building episode, the Grenville Orogeny , for which extensive evidence still survives happened in this period. This era was the high point of the Stromatolites before they declined in the Neoproterozoic . The era saw the development of sexual reproduction, which greatly increased the complexity of life to come. It was the start of development of communal living among organisms, the multicellular organisms . It was an Era of apparently critical, but still poorly understood, changes in the chemistry of the sea, the sediments of the earth, and the composition of the air. Oxygen levels had risen to perhaps 1 of today s levels at the beginning of the era and continued rising throughout the Era. Subdivisions The subdivisions of the Mesoproterozoic are, obviously, arbitrary divisions based on time. They are not geo or biostratigraphic units. The base of the Mesoproterozoic is defined chronometrically, in terms of years, rather than by the appearance or disappearance of some organism. This gives an illusory sense of certainty. Radiometric dating is a good tool, and gets better ... more details
File Mississippi Embayment relief map 2.svg thumb The Mississippi embayment stretches from central Louisiana into southern Missouri. Image SE USshoreline.svg thumb right Significant shorelines along the U.S. Gulf and Atlantic Coasts since the Cretaceous Period. The Mississippi Embayment is a physiographic feature in the south central United States , part of the Mississippi Alluvial Plain . It is essentially a northward continuation of the River delta fluvial sediments of the Mississippi River Delta to its confluence with the Ohio River at Cairo, Illinois . The embayment is a topography topographically low lying sedimentary basin basin that is filled with Cretaceous to recent sediment s. The northern end of the embayment appears as an anomalous break in regional geology geologic structure with Paleozoic sedimentary rocks both to the east in Kentucky and Tennessee and to the west in Missouri and Arkansas . The current sedimentary basin results from the filling of a Cretaceous tectonic basin and existed as a large bay in the Cretaceous through early Tertiary shoreline. The New Madrid Seismic Zone lies at the northern end of the embayment. It was the site of the large New Madrid Earthquake s of 1811 1812. The area is underlain by some anomalous geology. The Reelfoot Rift is an ancient failed continental rift that dates back to the Precambrian plate tectonics break up of the supercontinent Rodinia . The more recent opening of the Atlantic Ocean and Gulf of Mexico during late Paleozoic to early Mesozoic break up of Pangea no doubt affected and may have partially re activated the old rift. Formation of the embayment the Van Arsdale Cox explanation The Mississippi embayment represents a break in what was once a single, continuous mountain range comprising the modern Appalachian Mountains Appalachian range, which runs roughly on a north south axis along the Atlantic coast of the United States, and the Ouachita Mountains Ouachita range, which runs on a rough east west axis we ... more details
Yours For Mine is an experimental Christian indie rock band from the Shenandoah Valley in Virginia. Specifically Harrisonburg, Virginia . They officially started in late 2004 early 2005. Three members http www.iamjonathanwoods.com Jonathan Woods , Chad Altenberger, Joey Testa were formerly in a rock band called The Red Letter Days with long time friend Tyler Dowdy who played bass. Bassist Stephen Minnick and lead singer Jonathan Woods were also band mates in previous ventures. Jonathan played drums in alternative rock band http www.purevolume.com addressingathens Addressing Athens formerly Strawzeus with Stephen on bass.Stephen and his brother Jordan Minnick were also members of the Winchester, VA based post hardcore band The Lotus Years with drummer James Dearstyne, guitarist Chad Miner and lead vocalist Nick Davis. James Dearstyne and Nick Davis moved on to form a regional hardcore band called http www.washingtonpost.com wp dyn content article 2006 01 16 AR2006011601344.html One Bullet Short Of A Massacre . Current members Joey Testa Vocals Chad Altenberger Guitar BGV Benjamin Cooley Guitar BGV Stephen Minnick Bass BGV Dan Rolen Drums Previous members http www.iamjonathanwoods.com Jonathan Woods Vocals Guitar Drums left in 2010 Touring performance history Yours For Mine has performed with many regional, national and international acts such as Fear Before The March of Flames , August Burns Red , Clarity Process, Lex Vegas, http www.shapiropeople.com Shapiro , Olympia, The Myriad, Rodinia, Oh Sleeper, A Life Once Lost, Farewell Flight, John Reuben and many more. They have performed in various venues from the reaches of New Hampshire to the southwest state of Texas. Record releases Yours For Mine has released only one show only demo. It has not been distributed by any means other than merchandise table sales. The band release their full length release, Dear Children on disc December 12, 2008 Digitally January 13, 2009. The record is produced by the band and engineer ... more details
In geology , tectonostratigraphy refers either to rock sequences in which large scale layering is caused by the stacking of thrust sheets or nappes in areas of thrust tectonics or the effects of tectonics on lithostratigraphy . Tectonically formed stratigraphy One example of such a tectonostratigraphy is the Scandinavia n Caledonides . ref Roberts,D. & Gee,D. 1985. An introduction to the structure of the Scandinavian Caledonides. In Gee, D. G., and Sturt, B. A., eds. The Caledonide Orogen Scandinavia and related areas.John Wiley and Sons, Chichester, 55 68. ref Within the entire exposed 1800 km length of this Orogeny orogenic belt the following sequence is recognised from the base upwards wiktionary Autochthon Autochthon undisturbed foreland of the Baltica Baltic plate Parautochthon thrust sheets that have moved only a short distance up to 10s of km from their original position Lower allochthon far travelled thrust sheets derived from the Baltic plate passive margin , mainly sediments associated with the break up of Rodinia Middle allochthon also derived from the margin of the Baltic plate, Proterozoic basement and its Psammite psammitic cover Upper allochthon thrust sheets including island arc and Ophiolite ophiolitic sequences Uppermost allochthon thrust sheets containing sediments with fossil assemblages indicating an origin on the margin of the Laurentia Laurentian plate This vertically stacked sequence thus represents the passive margins of Baltica and Laurentia and intervening island arcs and back arc basin s telescoped together and emplaced on top of the Baltic Shield , involving hundreds of km of shortening. Within this overall stratigraphy the individual layers have their own tectonostratigraphy of stacked thrust sheets. Image Gulf of Suez Rift01.jpg thumb right 400px Generalised structural cross section through the central part of the Gulf of Suez. PZ LK Paleozoic to lower Cretaceous Nubia reservoir rock UK EO Upper Cretaceous to Eocene pre rift carbonate ... more details
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