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coral growth lines

coral growth lines

A Dictionary of Earth Sciences | 1999 | | Copyright

coral growth lines All corals that have a calcified outer wall display minute growth lines on their outer surfaces. The carbonate is secreted by symbiotic algae (zooxanthellae) which, responding to day and night, create a series of diurnal growth increments. Studies on Devonian isolate corals indicate a 400-day year and, therefore, a 22-hour day. Post-Devonian data confirm a near-linear deceleration of the Earth's rotational velocity towards the present 24-hour day. The number of daily growth lines can therefore be used in a crude way to calibrate the geologic record.
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AILSA ALLABY and MICHAEL ALLABY. "coral growth lines." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "coral growth lines." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O13-coralgrowthlines.html

AILSA ALLABY and MICHAEL ALLABY. "coral growth lines." A Dictionary of Earth Sciences. 1999. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-coralgrowthlines.html

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coral growth lines

A Dictionary of Ecology | 2004 | | Copyright

coral growth lines Minute growth lines on the outer surfaces of all corals that have a calcified outer wall. The carbonate is secreted by symbiotic algae (zooxanthellae) which, responding to day and night, create a series of diurnal growth increments. Studies on Devonian isolate corals indicate a 400-day year and, therefore, a 22-hour day. Post-Devonian data confirm a near-linear deceleration of the Earth's rotational velocity towards the present 24-hour day. The number of daily growth lines can therefore be used in a crude way to calibrate the geologic record.
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MICHAEL ALLABY. "coral growth lines." A Dictionary of Ecology. 2004. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "coral growth lines." A Dictionary of Ecology. 2004. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O14-coralgrowthlines.html

MICHAEL ALLABY. "coral growth lines." A Dictionary of Ecology. 2004. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-coralgrowthlines.html

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