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The Ordovician Period of the Paleozoic Era:
488.3 to 443.7 million years ago


An Ordovician scene showing the huge nautiloid cephalopod capturing the giant . Nearby are corals, brachiopods, and echinoderms, and two smaller nautiloids in the background. Graphic from Earth History Resources




The Ordovician Period is the second period of the Paleozoic Era. This important period saw the origin and rapid evolution of many new types of invertebrate animals which replaced their Cambrian predecessors. Primitive plants move onto land, until then totally barren. The supercontinent of Gondwana drifted over the south pole, initiating a great Ice Age that gripped the earth at this time. The end of the period is marked by an extinction event.

The Ordovician System of strata was founded by Lapworth in 1879 to resolve the Murchison-Sedgwick conflict over their overlapping claims for their Silurian and Cambrian systems. The name "Ordovician" comes from an ancient Celtic tribe that once inhabited the region in Wales where rock strata of this period occur.

The Ordovician was originally divided into two epochs, Bala and Dyfed. More recently, the Tremadoc was removed from the Cambrian and a three-fold division of Ordovician strata instituted.

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During the Ordovician, Southern Europe, Africa, South America, Antarctica and Australia remained joined together into the supercontinent of Gondwanaland, which had moved down to the South Pole. North America straddled the equator, and was about 45 degrees clockwise from its present orientation. Western and Central Europe were separate from the rest of Eurasia, and were rotated about 90 degrees counterclockwise from their present orientation, and was in the southern tropics. North America is engaged in a slow collision with the microcontinent of Baltica, which forms the core of what is later to become Europe. The Iapetus Ocean continues to shrink as the previously passive margins of Baltica and North America converge. Where the Iapetus was, mountains are thrust up, remnant strata of which remain today in Greenland, Norway, Scotland, Ireland and north-eastern North America. Scotland and England are united into a single landmass.


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The scheme for the Ordovician goes like this:

PeriodEpochAgeWhen beganDuration (Ma)
SilurianLlandoveryRhuddanian443.74.7
OrdovicianLate OrdovicianHirnantian445.61.9
Katian455.810.2
Sandbian460.95.1
Middle OrdovicianDarriwilian468.17.2
Dapingian471.83.7
Early OrdovicianFloian478.66.8
Tremadocian488.39.7
CambrianFurongianCambrian X4935

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A major transgression in the Middle Ordovician created widespread shallow, warm epicontinental seas. Thus, most of the Ordovician was favorable for marine life, particularly around the well-studied European and North American cratons. However, the Ordovician ended in a brief (300-500 ky), but severe, ice age. Gondwana, particularly Africa, straddled the South Pole and became extensively glaciated. There were even glaciers in what is now the Sahara. Metazoans were severely affected. About 60% of animal genera became extinct, making this the second or third most deadly mass extinction of the Phanerozoic.

As a natural consequence, a good deal of attention has been focused on the causes of the Ordovician Ice Age. In fact, it is not easy to see how an ice age could have occurred. Atmospheric carbon dioxide levels are believed to have been 8 to 20 times their current values. This ought to have prevented anything approaching an ice age. Sea levels were high through most of the Ordovician. They dropped, dramatically (about 50 m), in connection with the ice age, but it is hard to tell whether this was cause, effect, or both. One independent factor which would affect both pCO2 and sea level is the rate of sea floor spreading along mid-ocean ridges. As we might expect, the length of well-established mid-ocean ridges, i.e., the ridge between Gondwana, to the south, and Baltica plus Laurentia, to the north, was unusually short during the Late Ordovician. A former ridge between the two northern continents became inactive about this time. However, there may have been a very long ridge to the Northwest of Laurentia. The information is too sparse to be certain. In any event, the absence of active ocean crust formation would only affect the rate of CO2 outgassing, not the rate at which it was locked away in sediments.

The state of the art in mathematical modeling of the problem is described in the recent work of Hermann et al. (2004). The results are frustratingly uninformative. Sea surface temperatures for the later Ordovician are extremely sensitive to atmospheric carbon dioxide levels and to not much else. Even the changes in geography, which brought more land surface close to the South Pole, seem to have little effect on the outcome. The result in the image indeed predicts glaciers in Gondwana at the end of the Late Ordovician. Unfortunately, it also predicts glaciers in Gondwana at the beginning of the Late Ordovician, even with much higher sea levels. Thus, if the models have anything to tell us, it is that there must have been a very strong draw-down of CO2 over the Late Ordovician. No one, at this point, has been able to offer evidence suggesting a plausible agent which would remove roughly half of all atmospheric carbon dioxide in 10-15 My. (Perhaps it is worth asking professional astronomers if the output of the sun could have changed. The author is an amateur astronomer.)

ATW041124. Text public domain. No rights reserved.

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The Ordovician was an age in which new organisms evolve replacing those that died out at the end of the Cambrian. It was also one of the largest adaptive radiations in the Earth's history. The number of families of known marine invertebrates (mostly hard shelled forms, as - soft-bodied types rarely left fossils) increases from about 200 at the end of the Cambrian to around 500 in the early Ordovician. The widespread shallow, warm continental seas were the perfect environment for many groups of organisms. Micro-organisms such as colonial blue-green algae – - are widespread. (marine which build tiny shells) evolve for the first time. Organisms called , although existing during the , become more common. (possibly sponge-like organisms) also appear.

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An interesting phenomenon is the sudden increase in organisms. Cambrian animals were predominately crawling mud-grubbers and with a few swimming and burrowing predators thrown in. Filter feeders (such as Dinomischus and Lepidocystis) although an important part of the fauna, had not been exceedingly common. In the Ordovician an increase in the amount of would be the obvious explanation for the sudden increase in number and diversity of filter-feeders. The (animals that suck food from the water using a special fringe of tentacles around the mouth) are more filter feeders that do well in the Ordovician. There were further a great many stalked (filter-feeding echinoderms.

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Groups absent or under-represented in the Cambrian suddenly become more important. We see the first appearance of the , including both and forms, , and the (creatures distantly related to ). (The orange anemone-like animals in top-right of the underwater scene at the top of this page are rugose corals, possibly Streptelasma or Lambeophyllum.)

The appear in large numbers, and constitute the most predominant colonial animals of the time. Each bryozoan polyp is a tiny creature, not unlike a coral animal. Their distant cousins the hard-shelled are also successful. After humble Cambrian beginnings the articulate brachiopods greatly increase in diversity and abundance, with no fewer than fourteen new . The and orders were especially diverse.

Among the molluscs were newcomers such as bivalves, which were not common during this time, although the late Cambrian archaeogastropods develop at a moderate pace. A much more spectacular success story were the cephalopods. Small and rare in the late Cambrian, the nautiloids, evolve quickly along many different lines. At least ten different orders flourished at this time, all but one appearing for the first time during the early or middle part of the Ordovician. This astonishing diversity included straight-, curved, loosely coiled, and tightly coiled shelled types, and even one group (the ) that in order to become lighter and more streamlined lost the a large part of their shell altogether. These intelligent carnivorous molluscs replaced the Cambrian as the dominant life form and top predator of the world's ocean. The biggest, such as the (see graphic at top of page), attained huge size; with shells of upto 10 meters in length they were the largest animal that, up until that time, had ever lived.

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Ordovician trilobites were for the most part quite different from their Cambrian predecessors. Many evolved bizarre spines and nodules, others, such as Aeglina prisca (left) from the warm shallow seas of what is now Bohemia, were clearly pelagic nektonic swimming forms, and developed huge eyes with over a thousand facets, while still others went the other direction and lost their eyes altogether. Some trilobites developed shovel-like snouts for ploughing through mud, others fused the segments of their bodies, while the curious developed a broad pitted margin around the head shield.

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A number of early died out, others struggled on, while still others increase in diversity. The echinoderms included both stalked (filter-feeding) and a few mobile (some predatory) forms. Among the bizarre forms were the , which were able to push themselves along the mud by means of a stout "tail". It has even been suggested that certain carpoids are ancestral to the vertebrates, but in view of the late Cambrian vertebrate origin this is unlikely. During the Ordovician the Crinoids, rare during the Cambrian, suddenly appear and diversify in large numbers. Like the brachiopods these sessile (attached bottom-living) invertebrates were to become an important group of filter feeders throughout the rest of the Paleozoic.

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The Ordovician was the high point of the . These colonial possessed an anatomical structure suggestive of a portion of a spinal cord. They were vertebrate cousins rather than vertebrate ancestors. They evolved from benthic attached late Cambrian forms and diversified in a number of different planktonic types, including single-branched single and double rowed colonies, two-branched, four-branched, and even spiral forms.

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The vertebrate remain rare, although several different groups of evolve. Their cousins the animals, worm-like or eel-like organisms known mostly from numerous isolated (which were used to support some kind of grasping or breathing structure in the mouth or throat) represent a major component, quite possibly predators and certainly nektonic/, in the marine food-chain.

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Finally, a humble start to a new adventure: during the Ordovician the first creeping and move onto land, the beginning of a great new chapter of life.

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The isolated and drifting continents serve as island arks, on the continental shelves of which marine organisms evolved in different ways. There are two main geographical provinces, a northern, equatorial tropical one, and a southern cool-water one centered around . In the case of trilobites, North America and northwestern margins of Europe, Spitzbergen, Siberia and north-east Russia are characterized by a diverse fauna that H. B. Whittington calls the Bathyurid fauna. This includes trilobites of the families , , , , and . In a subprovince around Baltica and were rare and belonged to different genera. This indicated the Iapetus Ocean remained wide enough to act as a barrier to migration for these shallow water continental-shelf forms. In the cooler waters of Gondwanaland are found the Selenopeltis and Hungaiid-Calymenid faunal provinces, including trilobites of the family Hungaiidae, , , , and endemic Asaphidae. The differences between Bathyurid fauna and Hungaiid-Calymenid faunal provinces was due to a combination of climate factors and geographical separation.

The same biogeographical distribution seems to apply to articulate brachiopods as well. The Balto-Scandian region is better defined in the brachiopod then the trilobite faunas, and for much of the period can be considered a distinct biogeographical province.

In the later part of the Ordovician genera of families previously limited to one faunal province appear in another, indicating a tendency towards migration and cosmopolitism. Changed in oceanic circulation (distribution of planktonic larvae etc) along with approaching continental masses would have made possible migrations of shallow water benthos.

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The tremendous evolutionary radiation of nautiloid cephalopods meant an increase in the level of consciousness in Paleozoic oceans. Cephalopods are the most intelligent of all invertebrates, owing to the development of elaborate manipulative organs (tentacles for touching and grasping). One researcher described the common octopus as like a sort of aquatic dog or cat. Although Ordovician cephalopods were probably not equal to modern forms in intelligence, they were certainly superior to that of contemporary (non-cephalopod) life-forms.

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