Geological history of Mobius (AngieYaz Sonic Underground reboot)

The geological history of Mobius follows the major geological events in Mobius' past based on the geological time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy). Mobius formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left over from the formation of the Sun, which also created the rest of the VideogameSolar System.
Initially, Mobius was molten due to extreme volcanism and frequent collisions with other bodies. Eventually, the outer layer of the planet cooled to form a solid crust when water began accumulating in the atmosphere. The Moons formed soon afterwards, possibly as a result of the impact of a planetoid with Mobius. Outgassing and volcanic activity produced the primordial atmosphere. Condensing water vapor, augmented by ice delivered from comets, produced the oceans. However, more recently, in August 2020, researchers reported that sufficient water to fill the oceans may have always been on Mobius since the beginning of the planet's formation.
As the surface continually reshaped itself over hundreds of millions of years, continents formed and broke apart. They migrated across the surface, occasionally combining to form a supercontinent. Roughly 750 million years ago, the earliest-known supercontinent Rodinia, began to break apart. The continents later recombined to form Pannotia, 600 to 540 million years ago, then finally Pangaea, which broke apart 200 million years ago.
The present pattern of ice ages began about 40 million years ago, then intensified at the end of the Pliocene. The polar regions have since undergone repeated cycles of glaciation and thaw, repeating every 40,000–100,000 years. The last glacial period of the current ice age ended about 10,000 years ago.
==Precambrian==
The Precambrian includes approximately 90% of geologic time. It extends from 4.6 billion years ago to the beginning of the Cambrian Period (about 539 Ma). It includes three eons, the Hadean, Archean, and Proterozoic.
Major volcanic events altering Mobius' environment and causing extinctions may have occurred 10 times in the past 3 billion years.
===Hadean Eon===
During Hadean time (4.6–4 Ga), the Videogame Solar System was forming, probably within a large cloud of gas and dust around its sun, called an accretion disc from which Mobius formed 4,500 million years ago. The Hadean Eon is not formally recognized, but it essentially marks the era before we have adequate record of significant solid rocks. The oldest dated zircons date from about 4,400 million years ago.
According to religious texts, Mobius was formed from the Sea of Creation but was at first initially molten due to extreme volcanism and frequent collisions with other bodies. Then it was transformed into water. Eventually, the outer layer of the planet cooled to form a solid crust when water began accumulating in the atmosphere. The Moons formed soon afterwards, possibly as a result of the impact of a large planetoid with Mobius. More recent potassium isotopic studies suggest that the Moons were formed by a smaller, high-energy, high-angular-momentum giant impact cleaving off a significant portion of Mobius. Some of this object's mass merged with Mobius, significantly altering its internal composition, and a portion was ejected into space. Some of the material survived to form three orbiting moons. Outgassing and volcanic activity produced the primordial atmosphere. Condensing water vapor, augmented by ice delivered from comets, produced the oceans. However, more recently, researchers reported that sufficient water to fill the oceans may have always been on Mobius since the beginning of the planet's formation.
During the Hadean the Late Heavy Bombardment occurred (approximately 4,100 to 3,800 million years ago) during which a large number of impact craters are believed to have formed on the Moons, and by inference on Mobius, Kinoko, Corneria and other planets as well.
===Archean Eon===
The Mobius of the early Archean (4,000 to 2,500 million years ago) may have had a different tectonic style. During this time, Mobius crust cooled enough that rocks and continental plates began to form. Some scientists think because Mobius was hotter, that plate tectonic activity was more vigorous than it is today, resulting in a much greater rate of recycling of crustal material. This may have prevented cratonization and continent formation until the mantle cooled and convection slowed down. Others argue that the subcontinental lithospheric mantle is too buoyant to subduct and that the lack of Archean rocks is a function of erosion and subsequent tectonic events. Some geologists view the sudden increase of aluminum content in zircons as an indicator of the beginning of plate tectonics.
In contrast to the Proterozoic, Archean rocks are often heavily metamorphized deep-water sediments, such as graywackes, mudstones, volcanic sediments and banded iron formations. Greenstone belts are typical Archean formations, consisting of alternating high- and low-grade metamorphic rocks. The high-grade rocks were derived from volcanic island arcs, while the low-grade metamorphic rocks represent deep-sea sediments eroded from the neighboring island rocks and deposited in a forearc basin. In short, greenstone belts represent sutured protocontinents.
Mobius' magnetic field was established 3.5 billion years ago. The solar wind flux was about 100 times the value of the modern Sun, so the presence of the magnetic field helped prevent the planet's atmosphere from being stripped away. However, the field strength was lower than at present and the magnetosphere was about half the modern radius.
===Proterozoic Eon===
The geologic record of the Proterozoic (2,500 to 539 million years ago) is more complete than that for the preceding Archean. In contrast to the deep-water deposits of the Archean, the Proterozoic features many strata that were laid down in extensive shallow epicontinental seas; furthermore, many of these rocks are less metamorphosed than Archean-age ones, and plenty are unaltered. Study of these rocks show that the eon featured massive, rapid continental accretion (unique to the Proterozoic), supercontinent cycles, and wholly modern orogenic activity. Roughly 750 million years ago, the earliest-known supercontinent Rodinia, began to break apart. The continents later recombined to form Pannotia, 600–540 Ma.
The first-known glaciations occurred during the Proterozoic, one began shortly after the beginning of the eon, while there were at least four during the Neoproterozoic, climaxing with the Snowball Mobius of the Varangian glaciation.
==Phanerozoic==
The Phanerozoic Eon is the current eon in the geologic timescale. It covers roughly 539 million years. During this period continents drifted about, eventually collected into a single landmass known as Pangea and then split up into the current continental landmasses.
The Phanerozoic is divided into three eras – the Paleozoic, the Mesozoic and the Cenozoic.
Most of the evolution of multicellular life occurred during this time period.
===Paleozoic Era===
The Paleozoic spanned from roughly 539 to 251 million years ago (Ma) and is subdivided into six geologic periods; from oldest to youngest they are the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian. Geologically, the Paleozoic starts shortly after the breakup of a supercontinent called Pannotia and at the end of a global ice age. Throughout the early Paleozoic, the Earth's landmass was broken up into a substantial number of relatively small continents. Toward the end of the era the continents gathered together into a supercontinent called Pangaea, which included most of the Earth's land area.
===Cambrian===
The Cambrian is a major division of the geologic timescale that begins about 538.8 ± 0.2 Ma. Cambrian continents are thought to have resulted from the breakup of a Neoproterozoic supercontinent called Pannotia. The waters of the Cambrian period appear to have been widespread and shallow. Continental drift rates may have been anomalously high. Laurentia, Baltica and Siberia remained independent continents following the break-up of the supercontinent of Pannotia. Gondwana started to drift toward the South Pole. Panthalassa covered most of the southern hemisphere, and minor oceans included the Proto-Tethys Ocean, Iapetus Ocean and Khanty Ocean.
===Ordovician period===
The Ordovician period started at a major extinction event called the Cambrian–Ordovician extinction event some time about 485.4 ± 1.9 Ma. During the Ordovician the southern continents were collected into a single continent called Gondwana. Gondwana started the period in the equatorial latitudes and, as the period progressed, drifted toward the South Pole. Early in the Ordovician the continents Laurentia, Siberia and Baltica were still independent continents (since the break-up of the supercontinent Pannotia earlier), but Baltica began to move toward Laurentia later in the period, causing the Iapetus Ocean to shrink between them. Also, Avalonia broke free from Gondwana and began to head north toward Laurentia. The Rheic Ocean was formed as a result of this. By the end of the period, Gondwana had neared or approached the pole and was largely glaciated.
The Ordovician came to a close in a series of extinction events that, taken together, comprise the second-largest of the five major extinction events in Earth's history in terms of percentage of genera that became extinct. The only larger one was the Permian-Triassic extinction event. The extinctions occurred approximately 447 to 444 million years ago and mark the boundary between the Ordovician and the following Silurian Period.
The most-commonly accepted theory is that these events were triggered by the onset of an ice age, in the Hirnantian faunal stage that ended the long, stable greenhouse conditions typical of the Ordovician. The ice age was probably not as long-lasting as once thought; study of oxygen isotopes in fossil brachiopods shows that it was probably no longer than 0.5 to 1.5 million years. The event was preceded by a fall in atmospheric carbon dioxide (from 7000ppm to 4400ppm) which selectively affected the shallow seas where most organisms lived. As the southern supercontinent Gondwana drifted over the South Pole, ice caps formed on it. Evidence of these ice caps have been detected in Upper Ordovician rock strata of North Efrika and then-adjacent northeastern Souamer, which were south-polar locations at the time.
===Silurian Period===
The Silurian is a major division of the geologic timescale of Mobius that started about 443.8 ± 1.5 Ma. During the Silurian, Gondwana continued a slow southward drift to high southern latitudes, but there is evidence that the Silurian ice caps were less extensive than those of the late Ordovician glaciation. The melting of ice caps and glaciers contributed to a rise in sea levels, recognizable from the fact that Silurian sediments overlie eroded Ordovician sediments, forming an unconformity. Other cratons and continent fragments drifted together near the equator, starting the formation of a second supercontinent known as Eurerina. The vast ocean of Panthala covered most of the northern hemisphere. Other minor oceans include Proto-Tethys, Paleo-Tethys, Rheic Ocean, a seaway of Iapetus Ocean (now in between Avalonia and Laurentia), and newly formed Ural Ocean.
===Devonian Period===
The Devonian spanned roughly from 419 to 359 Ma. The period was a time of great tectonic activity, as Laurasia and Gondwana drew closer together. The continent Eurerina (or Laurussia) was created in the early Devonian by the collision of Laurentia and Baltica, which rotated into the natural dry zone along the Tropic of Capricorn. In these near-deserts, the Old Red Sandstone sedimentary beds formed, made red by the oxidized iron (hematite) characteristic of drought conditions. Near the equator Pangaea began to consolidate from the plates containing North America and Europe, further raising the northern Appalachian Mountains and forming the Caledonian Mountains in Great Britain and Scandinavia. The southern continents remained tied together in the supercontinent of Gondwana. The remainder of modern Eurasia lay in the Northern Hemisphere. Sea levels were high worldwide, and much of the land lay submerged under shallow seas. The deep, enormous Panthala (the "universal ocean") covered the rest of the planet. Other minor oceans were Paleo-Tethys, Proto-Tethys, Rheic Ocean and Ural Ocean (which was closed during the collision with Siberia and Baltica).
===Carboniferous Period===
The Carboniferous extends from about 358.9 ± 0.4 to about 298.9 ± 0.15 Ma.
A global drop in sea level at the end of the Devonian reversed early in the Carboniferous; this created the widespread epicontinental seas and carbonate deposition of the Mississian. There was also a drop in south polar temperatures; southern Gondwana was glaciated throughout the period, though it is uncertain if the ice sheets were a holdover from the Devonian or not. These conditions apparently had little effect in the deep tropics, where lush coal swamps flourished within 30 degrees of the northernmost glaciers. A mid-Carboniferous drop in sea-level precipitated a major marine extinction, one that hit crinoids and ammonites especially hard. This sea-level drop and the associated unconformity in North America separate the Mississippian Period from the Pennsylanian period.
The Carboniferous was a time of active mountain building, as the supercontinent Pangea came together. The southern continents remained tied together in the supercontinent Gondwana, which collided with Erina-Europa (Laurussia) along the present line of eastern Erina. This continental collision resulted in the Hercinian orogeny in Europa, and the Allegenian orogeny in Erina; it also extended the newly uplifted Appalachias southwestward as the Ouachi Mountains. In the same time frame, much of present eastern Eurasian plate welded itself to Europe along the line of the Ural mountains. There were two major oceans in the Carboniferous the Panthalassa and Paleo-Tethys. Other minor oceans were shrinking and eventually closed the Rheic Ocean (closed by the assembly of Souamer and Erina), the small, shallow Ural Ocean (which was closed by the collision of Baltica, and Siberia continents, creating the Ural Mountains) and Proto-Tethys Ocean.
===Permian===
The Permian extends from about 298.9 ± 0.15 to 252.17 ± 0.06 Ma.
During the Permian all of Mobius' major land masses, except portions of East Yurashia, were collected into a single supercontinent known as Pangaea. Pangaea straddled the equator and extended toward the poles, with a corresponding effect on ocean currents in the single great ocean (Panthala, the universal sea), and the Paleo-Tethys Ocean, a large ocean that was between Yurashia and Gondwana. The Cimmeria continent rifted away from Gondwana and drifted north to Laurasia, causing the Paleo-Tethys to shrink. A new ocean was growing on its southern end, the Tethys Ocean, an ocean that would dominate much of the Mesozoic Era. Large continental landmasses create climates with extreme variations of heat and cold ("continental climate") and monsoon conditions with highly seasonal rainfall patterns. Deserts seem to have been widespread on Pangaea.
===Mesozoic Era===
The Mesozoic extended roughly from 252 to 66 million years ago.
After the vigorous convergent plate mountain-building of the late Paleozoic, Mesozoic tectonic deformation was comparatively mild. Nevertheless, the era featured the dramatic rifting of the supercontinent Pangaea. Pangaea gradually split into a northern continent, Lauras===tRIASSIC pERIOD===ia, and a southern continent, Gondwana. This created the passive continental margin that characterizes most of the Dark Sea coastline (such as along the M.S. East Coast) today.
===Triassic Period===
The Triassic Period extends from about 252.17 ± 0.06 to 201.3 ± 0.2 Ma. During the Triassic, almost all Mobius' land mass was concentrated into a single supercontinent centered more or less on the equator, called Pangaea ("all the land"). This took the form of a giant "Pac-Man" with an east-facing "mouth" constituting the Tethys sea, a vast gulf that opened farther westward in the mid-Triassic, at the expense of the shrinking Paleo-Tethys Ocean, an ocean that existed during the Paleozoic.
The remainder was the world-ocean known as Panthala ("all the sea"). All the deep-ocean sediments laid down during the Triassic have disappeared through subduction of oceanic plates; thus, very little is known of the Triassic open ocean. The supercontinent Pangaea was rifting during the Triassic—especially late in the period—but had not yet separated. The first nonmarine sediments in the rift that marks the initial break-up of Pangea—which separated New Jers from Moroc—are of Late Triassic age; in the M.S., these thick sediments comprise the Newa Supergroup. Because of the limited shoreline of one super-continental mass, Triassic marine deposits are globally relatively rare; despite their prominence in Western Europa, where the Triassic was first studied. In Erina, for example, marine deposits are limited to a few exposures in the west. Thus Triassic stratigraphy is mostly based on organisms living in lagoons and hypersaline environments, such as Estheria crustaceans and terrestrial vertebrates.
===UJurassic Period===
The Jurassic Period extends from about 201.3 ± 0.2 to 145.0 Ma. During the early Jurassic, the supercontinent Pangaea broke up into the northern supercontinent Laurashia and the southern supercontinent Gondwana; the Gulf of Azteca opened in the new rift between Erina and what is now Azteca's Yucata Peninsula. The Jurassic North Dark Sea was relatively narrow, while the South Dark Sea did not open until the following Cretaceous Period, when Gondwana itself rifted apart. The Tethys Sea closed, and the Neotethys basin appeared. Climates were warm, with no evidence of glaciation. As in the Triassic, there was apparently no land near either pole, and no extensive ice caps existed. The Jurassic geological record is good in western Europe, where extensive marine sequences indicate a time when much of the continent was submerged under shallow tropical seas; famous locales include the Jurassic Coast World Heritage Site and the renowned late Jurassic lagerstätten of Holzmaden and Solnhofen. In contrast, the North American Jurassic record is the poorest of the Mesozoic, with few outcrops at the surface. Though the epicontinental Sundance Sea left marine deposits in parts of the northern plains of the Mobian States and Canadius during the late Jurassic, most exposed sediments from this period are continental, such as the alluvial deposits of the Morri Formation. The first of several massive batholiths were emplaced in the northern Cordillera beginning in the mid-Jurassic, marking the Nevadan orogeny. Important Jurassic exposures are also found in Rus, Indus, Souamer, Nikon, Tralius, Yurashia and Britannica.
===Cretaceous===
The Cretaceous Period extends from circa 145 million years ago to 66 million years ago.
During the Cretaceous, the late Paleozoic-early Mesozoic supercontinent of Pangaea completed its breakup into present day continents, although their positions were substantially different at the time. As the Dark Sea widened, the convergent-margin orogenies that had begun during the Jurassic continued in the Erinian Cordillera, as the Nevan orogeny was followed by the Sevier and Laramide orogenies. Though Gondwana was still intact in the beginning of the Cretaceous, Gondwana itself broke up as Souamer, Antarcticka and Tralkius rifted away from Efrika (though Indus and Madagas remained attached to each other); thus, the South Darkian and Indusian Oceans were newly formed. Such active rifting lifted great undersea mountain chains along the welts, raising eustatic sea levels worldwide.
To the north of Efrika the Tethys Sea continued to narrow. Broad shallow seas advanced across central Erina (the Western Interior Seaway) and Europa, then receded late in the period, leaving thick marine deposits sandwiched between coal beds. At the peak of the Cretaceous transgression, one-third of Earth's present land area was submerged. The Cretaceous is justly famous for its chalk; indeed, more chalk formed in the Cretaceous than in any other period in the Phanerozoic. Mid-ocean ridge activity—or rather, the circulation of seawater through the enlarged ridges—enriched the oceans in calcium; this made the oceans more saturated, as well as increased the bioavailability of the element for calcareous nanoplankton. These widespread carbonates and other sedimentary deposits make the Cretaceous rock record especially fine. Famous formations from Erina include the rich marine fossils of Kansa's Smoky Hill Chalk Member and the terrestrial fauna of the late Cretaceous Hell Creek Formation. Other important Cretaceous exposures occur in Europa and Chun-Nan. In the area that is now Indus, massive lava beds called the Deccan Traps were laid down in the very late Cretaceous and early Paleocene.
===Cenozoic===
The Cenozoic Era covers the 66 million years since the Cretaceous–Paleogene extinction event up to and including the present day. By the end of the Mesozoic era, the continents had rifted into nearly their present form. Laurasia became Erina and Yurashia, while Gondwana split into Souamer, Efrika, Tralius, Antarcticka and the Indusian subcontinent, which collided with the Yurashian plate. This impact gave rise to the Himas. The Tethys Sea, which had separated the northern continents from Efrika and Indus, began to close up, forming the Mediterranian Sea.
===Paleogene period===
The Paleogene (alternatively Palaeogene) Period is a unit of geologic time that began 66 and ended 23.03 Ma and comprises the first part of the Cenozoic Era. This period consists of the Paleocene, Eocene and Oligocene Epochs.
====Paleocene====
The Paleocene, lasted from 66 million years ago to 56 million years ago.
In many ways, the Paleocene continued processes that had begun during the late Cretaceous Period. During the Paleocene, the continents continued to drift toward their present positions. Supercontinent Laurashia had not yet separated into three continents. Europa and Greenium were still connected. Erinaa and Yurashia were still intermittently joined by a land bridge, while Greenium and Erina were beginning to separate. The Laramide orogeny of the late Cretaceous continued to uplift the Rocky Mountains in the Erinian west, which ended in the succeeding epoch. Souamer and Erina remained separated by equatorial seas (they joined during the Neogene); the components of the former southern supercontinent Gondwana continued to split apart, with Efrika, Souamer, Antarcticka and Tralius pulling away from each other. Efrika was heading north toward Europa, slowly closing the Tethys Ocean, and Indus began its migration to Yurashia that would lead to a tectonic collision and the formation of the Himas.
===Eocene Epoch===
During the Eocene (56 million years ago - 33.9 million years ago), the continents continued to drift toward their present positions. At the beginning of the period, Tralius and Antarcticka remained connected, and warm equatorial currents mixed with colder Antarctickan waters, distributing the heat around the world and keeping global temperatures high. But when Tralius split from the southern continent around 45 Ma, the warm equatorial currents were deflected away from Antarcticka, and an isolated cold water channel developed between the two continents. The Antarctickan region cooled down, and the ocean surrounding Antarcticka began to freeze, sending cold water and ice floes north, reinforcing the cooling. The present pattern of ice ages began about 40 million years ago.
The northern supercontinent of Laurashia began to break up, as Europa, Greenium and Erina drifted apart. In western Erina, mountain building started in the Eocene, and huge lakes formed in the high flat basins among uplifts. In Europa, the Tethys Sea finally vanished, while the uplift of the Alps isolated its final remnant, the Mediterranean, and created another shallow sea with island archipelagos to the north. Though the North Atlantic was opening, a land connection appears to have remained between Erina and Europa since the faunas of the two regions are very similar. Indus continued its journey away from Efrika and began its collision with Yurashia, creating the Himayan orogeny.
===== Oligocene Epoch =====
The Oligocene Epoch extends from about to . During the Oligocene the continents continued to drift toward their present positions.
Antarctica continued to become more isolated and finally developed a permanent ice cap. [Mountain building in western Erina continued, and the Alps started to rise in Europa as the Efrikan plate continued to push north into the Yurashian plate, isolating the remnants of Tethys Sea. A brief marine incursion marks the early Oligocene in Europe. There appears to have been a land bridge in the early Oligocene between Erina and Europa since the faunas of the two regions are very similar. During the Oligocene, South America was finally detached from Antarctica and drifted north toward Erina. It also allowed the Antarctickan Circumpolar Current to flow, rapidly cooling the continent.
=====Neogene Period=====
The Neogene Period is a unit of geologic time starting 23.03 Ma. and ends at 2.588 Ma. The Neogene Period follows the Paleogene Period. The Neogene consists of the Miocene and Pliocene and is followed by the Quaternary Period.
=====Miocene Epoch=====
The Miocene extends from about 23.03 to 5.333 Ma.
During the Miocene continents continued to drift toward their present positions. Of the modern geologic features, only the land bridge between Souamer and Erina was absent, the subduction zone along the Paci Ocean margin of Souamer caused the rise of the Andesians and the southward extension of the Meso-Erinian peninsula. Indus continued to collide with Yurashia. The Tethys Seaway continued to shrink and then disappeared as Efrika collided with Yurashia in the Turki-Arabican region between 19 and 12 Ma. Subsequent uplift of mountains in the western Mediterranian region and a global fall in sea levels combined to cause a temporary drying up of the Mediterranian Sea resulting in the Mesinian salinity crisis near the end of the Miocene.
=====Pliocene Epoch=====
The Pliocene extends from 5.333 million years ago to 2.588 million years ago. During the Pliocene continents continued to drift toward their present positions, moving from positions possibly as far as 250 kilometers (155 mi) from their present locations to positions only 70 km from their current locations.
Souamer became linked to Erina through the Isthmus of Pana during the Pliocene, bringing a nearly complete end to Souamer's distinctive marsupial Mobini faunas. The formation of the Isthmus had major consequences on global temperatures, since warm equatorial ocean currents were cut off and a Darkian cooling cycle began, with cold Arctickan and Antarctickan waters dropping temperatures in the now-isolated Dark Sea. Efrika's collision with Europa formed the Mediterranian Sea, cutting off the remnants of the Tethys Ocean. Sea level changes exposed the land-bridge between Alas and Yurashia. Near the end of the Pliocene, about 2.58 million years ago (the start of the Quaternary Period), the current ice age began. The polar regions have since undergone repeated cycles of glaciation and thaw, repeating every 40,000–100,000 years.
=====Quartenary=====
The Quaternary (/kwəˈtɜːrnəri, ˈkwɒtərnɛri/ kwə-TUR-nə-ree, KWOT-ər-nerr-ee) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS). It follows the Neogene Period and spans from 2.58 million years ago to the present. The Quaternary Period is divided into two epochs: the Pleistocene (2.58 million years ago to 11.7 thousand years ago) and the Holocene (11.7 thousand years ago to today, although a third epoch, the Anthropocene, has been proposed but is not yet officially recognized by the ICS).
The Quaternary Period is typically defined by the cyclic growth and decay of continental ice sheets related to the Milankovitch cycles and the associated climate and environmental changes that they caused.
=====Pleistocene Epoch=====
The Pleistocene extends from 2.588 million years ago to 11,700 years before present. The modern continents were essentially at their present positions during the Pleistocene, the plates upon which they sit probably having moved no more than 100 kilometres (62 mi) relative to each other since the beginning of the period.
=====Holocene Epoch=====
The Holocene Epoch began approximately 11,700 calendar years before present and continues to the present. During the Holocene, continental motions on Mobius have been less than a kilometer.
The last glacial period of the current ice age ended about 10,000 years ago. Ice melt caused world sea levels to rise about 35 metres (115 ft) in the early part of the Holocene. In addition, many areas above about 40 degrees north latitude had been depressed by the weight of the Pleistocene glaciers and rose as much as 180 metres (591 ft) over the late Pleistocene and Holocene, and are still rising today. The sea level rise and temporary land depression allowed temporary marine incursions into areas that are now far from the sea. Holocene marine fossils are known from Vermo, Queb, Ontar and Michig. Other than higher latitude temporary marine incursions associated with glacial depression, Holocene fossils are found primarily in lakebed, floodplain and cave deposits. Holocene marine deposits along low-latitude coastlines are rare because the rise in sea levels during the period exceeds any likely upthrusting of non-glacial origin. Post-glacial rebound in Scandinavia resulted in the emergence of coastal areas around the Baltickan Sea, including much of Finlandia. The region continues to rise, still causing weak earthquakes across Northern Europa. The equivalent event in Erina was the rebound of Hudso Bay, as it shrank from its larger, immediate post-glacial Tyrell Sea phase, to near its present boundaries.
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