Absolute dating of the pennsylvanian period

The Late Devonian Period experienced major extinctions within some marine invertebrate groups, and Carboniferous faunas reflect a different composition from what had prevailed earlier in the Paleozoic Era.Most notably, reef-forming organisms, such as tabulate corals and stromatoporoids (large colonial marine organisms similar to hydrozoans), were limited.Much of Laurussia lay near the paleoequator, whereas the cratons of Siberia, Kazakhstania, and most of Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the Late Carboniferous.Included in the paleogeographic reconstruction are cold and warm ocean currents.Consequently, Carboniferous reefs were poorly developed because of this lack of framework builders.Benthic, or sea-bottom, marine communities were dominated by the crinoids, a group of stalked echinoderms (invertebrates characterized by a hard, spiny covering or skin) that still lives today.Shallow seas occupied the continental shelf margins surrounding the continents.Fringe areas of Carboniferous continents may very well have become the continental interiors of the present day.

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The rocks that were formed or deposited during the period constitute the Carboniferous System.Fossil plants found in areas located in high latitudes during the Carboniferous exhibit seasonal growth rings, while those of the presumed equatorial coal swamps lack such rings, as do modern tropical trees.The Carboniferous was a time of diverse marine invertebrates.Carboniferous Period, fifth interval of the Paleozoic Era, succeeding the Devonian Period and preceding the Permian Period.In terms of absolute time, the Carboniferous Period began approximately 358.9 million years ago and ended 298.9 million years ago.

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    Dianne Laguerta is a graduate of Mount Holyoke College with a bachelor's degree in history and Middle Eastern studies.