Mac OS X 10.4 or 10.5 - Setup as Server Download Article. Mac OS X 10.4 and 10.5 include the server component out of the box so all we need to do is turn it on. The Ordovician is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period 485.4 million years ago to the start of the Silurian Period 443.8 Mya. The Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same rock beds in northern Wales into the Cambrian. The 'classic' Mac OS is the original Macintosh operating system that was introduced in 1984 alongside the first Macintosh and remained in primary use on Macs until the introduction of Mac OS X in 2001. NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window. What does ordovician mean? Of, relating to, or being the period of geologic time from about 488 to 443 million years ago, the second period of the.
Ordovician - generative primevil sea creatures
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Sit back and watch the procedurally generated Ordovician sea.
Made for Procjam 2015
Code/Art etc by Tom Betts
Audio Soundtrack by VDU
Underwater loop from
You can actually press 'r' to force regeneration of the beasites, but its kind of nice to let them do it themselves.
| Status | Released |
| Platforms | Windows, macOS |
| Rating | |
| Author | tomnullpointer |
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Some freaky looking sea monsters in there! I included it in my ProcJam compilation video series, if you'd like to check it out :)
During the Ordovician, most of the world's land was collected together in thesuper-continent Gondwana. Gondwana consisted of Southern Europe,Africa, South America, Antarctica, and Australia. Throughout the Ordovician,Gondwana moved towards the South Pole where it finally came to rest at theend of this period. In the Early Ordovician, North America roughly straddledthe equator and almost all of that continent lay underwater. However, by theMiddle Ordovician North America became land with a karst topography onexposed carbonate rocks that developed. Taconica, a tectonic highland,formed along the margin of eastern North America. Also at this time,Western and Central Europe were separated and located in the Southern Tropics;Europe shifted towards North America from higher to lower latitudes.
Ordovician Ostracoderm
During the Middle Ordovician, uplifts took place in most of the areas thathad been under shallow shelf seas. These uplifts are seen as the precursor toglaciation. Also during the Middle Ordovician, latitudinal plate motions appearto have taken place, including the northward drift of the BaltoscandianPlate (northern Europe). Increased sea floor spreading and ridge activityaccompanied by volcanic activity occurred in the Llanvirnian. Ocean currentschanged as a result of lateral continental plate motions causing the opening ofthe Atlantic ocean. Sea levels underwent regression and transgression globally. Because of sea level transgression, flooding of the Gondwana craton occurredas well as regional drowning which caused carbonate sedimentation to stop.
During the Ashgillian (Late Ordovician), a major glaciation centered inAfrica occurred. Because of this global disturbance, oxygenation, ocean erosion,and a severe drop in sea level resulted. In addition, aggressive circulation,then shrinking, of tropical belts also resulted. This glaciation caused adramatic regression of ocean waters which drained nearly all craton platforms.More specifically, this glaciation contributed to ecological disruption andmass extinctions. Nearly all conodonts disappeared in the NorthAtlantic Realm while only certain lineages becameextinct in the Midcontinental Realm. Asaphoid larvae-bearing trilobites,echinoderms, brachiopods, bryozoans, graptolites, and chitinozoans alsobecame extinct. The Atlantic Ocean closed as Europe moved towards NorthAmerica. Climatic fluctuations were extreme as glaciation continued and becamemore extensive. Cold climates with floating marine ice developed asthe maximum glaciation was reached.
For additional maps of the Ordovician world, visit theOrdovicianpage at the Paleogeography Through Geologic Time site by Dr. Ron Blakey of Northern Arizona University.
Read about the Ordovician Mass Extinction at theHooper Virtual Paleontology Museum.
Ordovician Mass Extinction Evidence
Find out more about the Ordovician paleontology and geology of North America at the Paleontology Portal.
Sources:C. Barnes & Z. Ji, 1993. A major conodont extinction event during the Early Ordovician within the Midcontinental realm. Paleogeography, Paleoclimatology, Paleoecology, pp. 37-47.
Mac Os Versions
T. N. Koren, 1991. Evolutionary Crisis of the Ashgill Graptolites. Geological Survey of Canada, pp. 157-164
J. R. Laurie & B. D. Webby, 1992. Preliminary correlation of latest Cambrian toEarly Ordovician sea level events in Australia and Scandinavia. Global Perspectives on Ordovician Geology, pp. 381-394.
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J. D. Marshall, P. J. Brenchley, P. Mason, G. A. Wolff, R. A. Astini, L. Hints,& T. Meidla, 1997. Global Carbon Isotopic Events Associated with Mass Extinction and Glaciation in the Late Ordovician. Paleogeography, Paleoclimatology, Paleoecology, pp. 195-210.