Where results make sense

About us   |   Why use us?   |   Reviews   |   PR   |   Contact us

Topic: Early Permian

    Note: these results are not from the primary (high quality) database.

NMBGMR Staff - Peter Scholle - Guadalupe Mountains Thus, the back reef areas of the Permian reef complex are typified by calcareous grainstones and mudstones with a mixture of preserved primary porosity and secondary porosity related to such factors as early freshwater cementation and leaching, early dolomitization, or late (mesogenetic) dissolution of evaporite minerals. This deformation led to erosional exhumation of original Permian topography on the western margin of the region, widespread influx of meteoric waters with renewal of deep ground-water circulation, dissolution and/or replacement of Permian evaporites, and widespread cavern formation in limestones of the Guadalupe Mountains. Permian sandstone units do not thin over the pisolite facies so that it is unlikely that this facies was itself an elevated barrier as required by caliche hypotheses thus a back-barrier seepage area fits the topographic constraints. geoinfo.nmt.edu /staff/scholle/guadalupe.html

The Permo-Triassic Extinction At the boundary between the Permian and Triassic systems, the diversity of life represented in the fossil record is reduced to a level not seen since the Cambrian. Stromatolites make a handy food source for benthic marine grazers, and their presence in early Triassic normal marine deposits was probably facilitated by the extinction of shallow marine fauna that would normally consume them. Life on the early Triassic earth was remarkably homogenous, as a handful of taxa which survived the extinction proliferated across the planet, for instance the brachiopod Lingula, the bivalves Claraia, Eomorphis, and Unionites, the weedy plant Isoetes, and the mammal-like reptile Lystrosaurus. www.geocities.com /earthhistory/permo.htm

NMBGMR Staff - Peter Scholle - Guadalupe Mountains Thus, the back reef areas of the Permian reef complex are typified by calcareous grainstones and mudstones with a mixture of preserved primary porosity and secondary porosity related to such factors as early freshwater cementation and leaching, early dolomitization, or late (mesogenetic) dissolution of evaporite minerals. Permian sandstone units do not thin over the pisolite facies so that it is unlikely that this facies was itself an elevated barrier as required by caliche hypotheses thus a back-barrier seepage area fits the topographic constraints. Likewise, the Permian facies suite of fore-reef debris, reef, back-reef rubble, near-back-reef skeletal sands and muds, islands, restricted lagoons, and finally supratidal deposits is remarkably similar to the general facies spectrum found in the Florida Keys-Florida Bay area (Ginsburg, 1964; Purdy, 1963). geoinfo.nmt.edu /staff/scholle/guadalupe.html#top   (11226 words)

Dimetrodon, Permian Period, Dimetrodon Art Print 13" x 19" It was a predacious reptile that was on the top of the food chain during the early Permian. TIME - 280 - 260 MYA, Early Permian period. Dimetrodon was a dominant carnivore, the largest one of the Permian period. store.dinosaurcorporation.com /permian.html   (332 words)

Palaeos Paleozoic: Permian: The Rotliegendes / Cisuralian (Early Permian) period In the Early Permian, the last refuge for some of the vertebrate taxa that were widespread in Devonian times was the marginal, possibly brackish or freshwater, environment. The Cisuralian is the Early Permian and covers about half of the Permian Period by current reckoning of the absolute dates. A Permian reef (Artinskian of Texas), showing an abundance of sponges, rugose corals and brachiopods, a gastropod (left)), a spiny-shelled nautilid Cooperoceras (right foreground) and a smooth shelled ammonoid (center background). www.palaeos.com /Paleozoic/Permian/Cisuralian.html   (409 words)

PERMIAN BASIN SPELEOLOGICAL SOCIETY The Permian Basin Speleological Society was founded by Tony Grieco and Bill Bentley in October 1983 and was chartered as the 300th grotto of the National Speleological Society on Janurary 18, 1984. The Permian Basin Speleological Society is meeting at Murrrys Delicatessan at 3211 West Wadley, Midland, Texas at 7:00PM on the second Tuesday of each month. Early club trips included many trips to the caves of the Guadalupe Mountains of Texas and New Mexico as well as exploration in Comanche Springs Cave and Amazing Maze Cave as new discoveries in early 1984.... www.caver.net /pbss/pbss.html   (463 words)

The Permian Period Unlike most other geological periods which have a three-part division into early, middle, and late, the Permian Period is conventionally divided into early and late only, although a more recent arrangement has a three-fold division. The Permian period was named in 1841 by the geologist Murchison after a tour of Imperial Russia to include the "vast series of beds of marls, schists, limestones, sandstones, and conglomerates" that overlay the Carboniferous formations in the eastern part of the country. Permian Period - Introduction - maps and other information of the Permian Earth, from the Paleographic Atlas Project www.palaeos.com /Paleozoic/Permian/Permian.htm   (463 words)

Handbook of Texas Online: PERMIAN BASIN Horseshoe Atoll is a subsurface accumulation of fossiliferous limestone, as much as 3,000 feet thick, deposited during Pennsylvanian and early Permian time in the northern part of the Midland basin in West Texas. By 1923 it was presumed that the Permian Basin was in the form of an elliptical bowl, the subsurface strata dipping from the rim to a maximum depth in the middle. The first commercial oil well in the Permian Basin was completed in 1921 in Mitchell County, on the east side of the basin; completed at a total depth of 2,498 feet, it was the discovery well of the Westbrook field. www.tsha.utexas.edu /handbook/online/articles/view/PP/ryp2.html   (463 words)

MESOZOIC the DINOSAURS Diorama Cretaceous, Jurassic, Triassic, Early, Middle, Late The Early Triassic is dominated by the plants and animals that had survived the Late Permian extinction. The Middle Triassic is a period of transition as dicynodonts and cynodonts whose ancestors dominated the Late Permian decline and archosaurs the ancestors of dinosaurs and crocodiles experiment with a variety of plant eating and carnivorous forms. The Early Maastrichtian is represented by the Kirtland and Horse Shoe faunas. www.dinosaurcollector.150m.com /mesozoic_home.htm   (940 words)

Dimetrodon - Permian Period It was a predacious reptile that was on the top of the food chain during the early Permian. - 280 - 260 MYA, Early Permian period. Dimetrodon was a dominant carnivore, the largest one of the Permian period. www.prehistory.com /dimetrod.htm   (940 words)

Palaeos Paleozoic: Permian: The Permian Period The early Permian saw the continuation of the Carboniferous biomes, with polar tundra regions and warm wet tropical swamp forests. The Permian period was named in 1841 by the geologist Murchison after a tour of Imperial Russia to include the "vast series of beds of marls, schists, limestones, sandstones, and conglomerates" that overlay the Carboniferous formations in the eastern part of the country. The Permian oceans were dominated by a diverse group of spiny-finned (actinopterygian) fishes, most of which had thick, heavy scales and rather basic jaw structures (if you look carefully, you can see this in the image of Palaeoniscus). www.palaeos.com /Paleozoic/Permian/Permian.htm   (1677 words)

Causes of the Permian Extinction However, although this is a viable theory, the formation of Pangea and the ensuing destruction of the continental shelves occurred in the early and middle Permian, and mass extinction did not occur until the late Permian. A third possible mechanism for the Permian extinction is rapid warming and severe climatic fluctuations produced by concurrent glaciation events on the north and south poles. Another theory which explains the mass extinctions of the Permian is the reduction of shallow continental shelves due to the formation of the super-continent Pangea. hannover.park.org /Canada/Museum/extinction/permcause.html   (378 words)

Permian Diadectes sp., from the Early Permian, 280-250 mya, was a land-dwelling plant eater. The Permian Castille Formation (layered white gypsum with darker laminae of calcite) formed in the hypersaline waters in the isolated basin behind the Capitan Reef Late Permian was a time of widespread regression of the seas. gpc.edu /~pgore/geology/geo102/permian.htm   (302 words)

Search Results for Permian - Encyclopædia Britannica The interval between the middle of the Carboniferous and the Early Permian is characterized by a prolonged ice age (see Paleozoic Era: Carboniferous Period: Carboniferous environment). Life during the Permian was very diverse, and the marine life of the period was perhaps more diverse than that of modern times. Though the Permian-Triassic mass extinction was the most extensive in the history of life on Earth, it should be noted that many groups were showing evidence of a gradual decline long before the end... www.britannica.com /search?query=Permian&submit=Find&source=MWTEXT   (449 words)

Late Permian The synapsid theraspids evolve from the pelycosaurs of the Early Permian and fill most of the ecological roles. At the end of the Permian is the greatest extinction of all time, 95% of land and sea species die out. Dinocephalians like the giant plant eater Moschops, dominate the first part of the Late Permian but die out before the great extinction at the end of the period. hometown.aol.com /rsknol/LPermian.html   (322 words)

The Paleogeographic Atlas Project, University of Chicago, Global Paleogeography, Paleobotany, Paleoclimates "Icehouse" climates typical of the Early Permian have well developed floral gradients like today while "Hothouse" conditions like the Jurassic show greater uniformity with plant productivity highest in the mid to high latitudes. We have also examined biogeographic patterns in diverse groups, ranging from dinosaurs to ammonoids to determine the limiting effects of climatic zonation and biogeographic barriers on geographic distributions. Patterns in fossil floras are useful in detecting global change because they are expressive of temperature and precipitation changes. pgap.uchicago.edu   (434 words)

Search Tuna Report for permian extinction However, although this is a viable theory, the formation of Pangaea and the ensuing destruction of the continental shelves occurred in the early and middle Permian, and mass extinction did not occur until the late Permian.... The end Permian extinction wiped out 90% of all marine species and 70% of land vertebrates and it was triggered by a collision with a comet or asteroid, according to a team led by a University of Washington scientist.... The mass extinction marks the boundary between the Permian and Triassic periods of geologic time and is the worst of five similar catastrophes during Earth's prehistory, the most recent of which scientists believe led to the extinction of dinosaurs 65 million years ago.... www.searchtuna.com /ftlive2/1047.html   (2989 words)

The Triassic Period Click to go forward to the Jurassic, or back to the end of the Paleozoic Era, the Permian Period. For more information, see Charles Messing's course notes on life in the Early Mesozoic. Click on the buttons below to learn more about the Triassic. www.ucmp.berkeley.edu /mesozoic/triassic/triassic.html   (2989 words)

papers.txt The results of study on Paleozoic conodonts in Vietnam [in Vietnamese with English summary; reports Devonian, Carboniferous and Early Permian conodonts]. Early Devonian conodonts from a limestone olistolith with 'Orthoceras' in the rift-related sediment, Amasya, northeastern Turkey [abs.]. Early Ordovician conodonts from the southern Cuyania Terrane (Mendoza Province, Argentina) [abs.]. www.le.ac.uk /geology/map2/pander/pander97/papers.txt   (2989 words)

TCS: Tech Central Station - Welcome to the Ordovician The Ordovician's extinction severity was second only to that of the Permian extinction of 250 million years ago during which perhaps one-half of families and 90 percent of species died out. Solving the Ordovician puzzle could improve understanding of the complicated processes that store carbon in and exchange it between the land, ocean, sea floor, biota and atmosphere on many different time scales, and how that carbon cycle affects -- and is affected by -- climate. As the Ordovician rolled in, the fossil record writes of rich array of established marine life with protective shells, tubes or plates, including the phyla of arthropods (for example, trilobites), echinoderms (starfish), brachiopods and coral cnidaria (corals). www.techcentralstation.com /042304D.html   (2989 words)

Bulletin 86 Table of Contents Comagmatic plutons, emplaced during this early eruptive period, were partly unroofed and eroded prior to inception of the upper volcanic cycle. Bulletin 86 discusses the Early Jurassic Toodoggone Formation, which is a new stratigraphic division of the Hazelton Group in the Toodoggone River map area, north-central British Columbia. Basal strata of the Toodoggone Formation unconformably overlie submarine island-arc volcanic rocks and sediments of the Permian Asitka and Upper Triassic Takla groups and, in turn, are capped unconformably by Cretaceous continental clastic rocks of the Sustut Group. www.em.gov.bc.ca /Mining/Geolsurv/Publications/Bulletins/Bull86/toc.htm   (748 words)

Permian Basin Football Permian’s Roy Williams earned his third consecutive first-team berth at receiver, despite being healthy for just the first three quarters of the year. Quarterback: Justin Whitaker, Permian, 5-11, 153, Jr.; Elliott Strader, Cooper, 6-1, 182, Sr. Norman, a senior who was switched from defensive end to middle linebacker early in the year, led the Rebels with 92 tackles in the regular season. www.oaoa.com /football/pbfb121399c.htm   (748 words)

Permian Basin Petroleum Museum Visitor Guide -Midland, TX View life under the sea over 200 million years ago, when the Permian Basin was covered by water. Permian Basin Petroleum Museum Visitor Guide -Midland, TX Midland, Texas has great museums. These are just a snap shot of the amazing adventures waiting for visitors at the Permian Basin Petroleum Museum. www.visitmidlandtx.com /sections/attractions/museum_micro/PM-general.asp   (748 words)

Yale Peabody Museum: The Mural, Permian There were no true lizards during the Permian, but it is most likely that Araeoscelis played the role of a lizard in the early Permian community, scurrying after insects and grubs in the underbrush. The plants that were to inherit the drastically changed world depicted in the central portion of The Age of Reptiles would be the hardier ferns and seed plants, including close relatives of our modern conifers, such as the Lebachia that stand near the border of the Permian and the Triassic sections of the mural. The Permian was a time of major evolutionary change for animals. www.peabody.yale.edu /mural/permian/Text.html   (748 words)

Palaeos Ecology : Extinction : Extinction The background extinction data displays two patterns: First there is an apparent decline in extinction intensity values through the Phanerozoic; very high rates of extinction seemed to be 'normal' for the early Paleozoic, gradually dropping away to levels around 5 to 10% from about the Jurassic onwards. Although some type of asteroid/comet impact occurs in virtually all of the Permian–Recent stages that contain a ‘mass extinction’, neither impact size nor impact number exhibits a statistically significant association with extinction magnitude. Extinction strikes in both the land and the sea, though higher rates are generally cited among marine forms. www.palaeos.com /Ecology/Extinctions/Extinction.html   (748 words)

Late Paleozoic Impacts At Early Permian, the main land-vertebrates were temnospondyls, which were at that time already archaic, and newly evolved basal synapsid amniotes (so called " pelycosaurs "). Permian (290 - 251 MYBP) is the last age of the Palaeozoic era. Some of the Late Permian land-vertebrates were quite large, the largest gorgonopsid, Inostrancevia was over 4 metres long, and one of the largest herbivores, pareiasaur Scutosaurus, has been estimated to weigh appr. www.fmnh.helsinki.fi /users/haaramo/Meteor_Impacts/Late_Paleozoic_impacts.htm   (748 words)

Benton Difficulty in identifying mass extinctions amopng tetrapods (Late Permian-Early Jurassic). Early radiation of the neoselachian sharks in western Europe. Early origins of modern birds and mammals: molecules vs. morphology. palaeo.gly.bris.ac.uk /personnel/benton/Benton.html   (5375 words)

The Permo-Triassic Extinction Tempo of the end-Permian event: high-resolution cyclostratigraphy at the Permian-Triassic boundary. Life on the early Triassic earth was remarkably homogenous, as a handful of taxa which survived the extinction proliferated across the planet, for instance the brachiopod Lingula, the bivalves Claraia, Eomorphis, and Unionites, the weedy plant Isoetes, and the mammal-like reptile Lystrosaurus. Like the end-Permian, both events are associated with warming, marine anoxia, major carbon isotope excursions, and the preferential extinction of benthic marine organisms (Wignall, 2001). www.geocities.com /earthhistory/permo.htm   (6257 words)

Triassic Dinosaurs - ZoomDinosaurs.com The cause of the Permian extinction might have been global cooling, volcanic eruptions, or a decrease in the continental shelf area during the formation of Pangaea Most of the early, primitive dinosaurs also went extinct, but other, more adaptive dinosaurs evolved in the Jurassic. No one is certain what caused this late Triassic extinction; possibilities include global cooling or an asteroid impact. www.enchantedlearning.com /subjects/dinosaurs/mesozoic/triassic   (6257 words)

The delayed resurgence of equatorial forests after the Permian-Triassic ecologic crisis -- Looy et al. 96 (24): 13857 -- Proceedings of the National Academy of Sciences Generalized stratigraphic distribution of selected latest Permian and Early/Middle Triassic spore and pollen types in Europe. Permian, accumulating information from Africa and Arabia supports Relative abundances are expressed as percentages of total spore and pollen assemblage, and plus signs indicate rare, isolated occurrences. www.pnas.org /cgi/content/full/96/24/13857   (6257 words)

Try your search on: Qwika (all wikis)

About us   |   Why use us?   |   Reviews   |   Press   |   Contact us   Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.