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The Early Ordovician Epoch
488 to 472 million years ago

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From the point of view of a hypothetical oberver, the Early Ordovician was the "good old days." Things were simpler then. It was really just an extension of the , but with a new generation of - sleeker, probably a bit stronger, but still trilobites. Lots of phylogenetic change was in the air, or actually in the water, but it was mostly happening in the same lush, warm epicontinental seas. Besides, organisms stuck to their roots back then. There were from and other crinoids from , and yet others from East , and you could really tell the difference. None of this messy business with everyone running around everywhere in a totally disorganized fashion. It all would have been just fine if it hadn't been for that worthless . Everything was going along just great, but then Baltica and Laurentia got too close, and suddenly we've got mountains twelve thousand meters high sprouting like mushrooms overnight. Things went to hell pretty fast after that, I'd say.

As in the ramblings of many old-timers (such as ourselves), hypothetical or otherwise, there is both more and less here than meets the eye. Things really were simpler in the Early Ordovician. diversity was on the edge of another leap almost comparable to the Cambrian explosion. However, this was a slower matter, and the long run results were mixed. The are a good example. Crinoids had evolved well before the Early Ordovician. But during this epoch, they became dominant in many ecosystems on the continental shelves, a dominance they were destined to maintain into the Mid-Jurassic in some regions. ("star fishes") and ("brittle stars") both evolved in the Early Ordovician. Asteroids didn't become important until the . Ophiuroids have never amounted to much. The Early Ordovician also saw the evolution of two new high-level taxa of - but the entire clade was extinct by the end of the Ordovician. Other novelties of the Early Ordovician met similarly mixed fates, e.g., several new types of articulate ( & ) and .

The world of the Early Ordovician was also much like the Cambrian. were still common. In fact, there had been a moderate resurgance of stromatolites in the . However, the Early Ordovician was the last epoch in which these massive bacterial colonies would be common. The renewed decline of stromatolites was simply more opportunity for , , and , who flourished by replacing stromatolites in the Early Ordovician. Similarly, bioturbation of near-shore sediments by worms, , trilobites and other burrowing forms was not yet universal, and sea bottoms stiffened by algal mats were still relatively common. Again, the Early Ordovician was also probably the last epoch for which this was true.

The fauna of the Early Ordovician was also strongly endemic. In fact, sharp differences between local faunas continued well into the Middle Paleozoic. However, this feature of Paleozoic life was exaggerated in the Early Ordovician due to the wide dispersal of continental cratons in the temperate and equatorial zones. The exact position of many of the continents remains controversial, probably because of this dispersal. Its hard to tell, for example, precisely where and Baltica were in the Early Ordovician, since they weren't in contact with any other land masses. Avalonia and Baltica lay to the south and east of Laurentia. was to the northeast. The are between them was the broad and loosly confined . Further east, poorly known microcontinents were assembling other bits and pieces of what would one day be Asia. Finally, yet further east, and the Chinese terranes formed the tail end of East Gondwana. The rest of Gondwana lay far to the south, as a huge south polar continent. Since no land plants had yet evolved, and Ordovician climates were well stratified from north to south, this was a broad, lifeless barrier to dispersal, not the east-west faunal highway it would become in the Devonian and Late Paleozoic.

ATW041125. Text public domain. No rights reserved.

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This map is derived from several sources, including two different time slices from , , the , and . We'd probably put Baltica a bit further east, if we were to do it over again. Note that and are rotated about 90┬░ clockwise from their present orientations.

ATW041124. Map public domain. No rights reserved. An enormous, 2400 x 1200 pixel, unlabelled version of this map is available (free) in all the usual formats, including a Photoshop® .psd file with each topographical type on a different layer. That one is 8 MB, so you'd best have a fast connection. CD also available for the cost of mailing with various large graphics. Email


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