The Triassic - common in Triassic and younger rocks. Modern...

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The Triassic The Triassic period lasted from 245 to 208 million years ago. Following the massive extinction at the end of the Permian, the survivors underwent adaptive radiations as they diversified and began to reoccupy many of the now-vacated environmental roles. Life in Water Coral, decimated by Paleozoic extinctions, rebounded during the Triassic with the evolution of the scleractinian corals. Dinoflagellates made their first appearance as part of the phytoplankton . Dinoflagellates have an excellent fossil record and make useful index fossils for age dating of rocks. The oldest possible dinoflagellate was Arpylorus antiquus , from the Silurian period . Dinoflagellates become more
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Unformatted text preview: common in Triassic and younger rocks. Modern scleractinian corals have some symbiotic dinoflagellates, known as zooxanthellae, living inside the coral. Both groups seem to appear in the fossil record at approximately the same time, suggesting the symbiosis was a valuable relationship. Another group of phytoplankton that appeard at the end of the Triassic was the coccolithophorids, usually shortened to coccoliths. These small fragments of a much larger, yet still microscopic, creature collect calcium carbonate from the seawater and use it to build their small "skeletons". Below is an electron micrograph of a coccolith collection formed by a modern alga....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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The Triassic - common in Triassic and younger rocks. Modern...

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