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karang langka zaman Jurassic awal Amerika Utara

Date:

September 29, 2015

Source:

Geological Society of America

Summary:

Peristiwa kepunahan massal menekankan evolusi lingkungan laut , dan biota pemulihan membuka jalan bagi perubahan biotik utama . Memahami respon dari organisme laut dalam tahap pemulihan pasca - kepunahan sangat penting untuk mendapatkan wawasan tentang dinamika perubahan ini , banyak reorganisasi biotik  yang dibawa tersapu.

........ Karena karang Awal  Jurassic dari Amerika Utara yang sangat langka , kejadian yang baru ditemukan sangat penting untuk memahami tanggapan biotik dalam interval pasca kepunahan  massal.....more

Rare early Jurassic corals of North America

Date:

September 29, 2015

Source:

Geological Society of America

Summary:

Mass extinction events punctuate the evolution of marine environments, and recovery biotas paved the way for major biotic changes. Understanding the responses of marine organisms in the post-extinction recovery phase is paramount to gaining insight into the dynamics of these changes, many of which brought sweeping biotic reorganizations.

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Mass extinction events punctuate the evolution of marine environments, and recovery biotas paved the way for major biotic changes. Understanding the responses of marine organisms in the post-extinction recovery phase is paramount to gaining insight into the dynamics of these changes, many of which brought sweeping biotic reorganizations.

In the October issue of GSA Today, Montana Hodges and George Stanley Jr. of the University of Montana Paleontology Center report on coral recovery after the end-Triassic mass extinction event at the Triassic-Jurassic (T/J) mass extinction boundary. The authors examined Jurassic corals in a continuous depositional section of the Gabbs and Sunrise Formations near New York Canyon in west-central Nevada, USA.

Because Early Jurassic corals from North America are so rare, newly discovered occurrences are vital to understanding biotic responses in the post-mass extinction interval. In this paper, Hodges and Stanley make a preliminary report of the earliest Jurassic corals from the U.S., which are also some of the earliest in North America. These examples occur at New York Canyon in west-central Nevada's Sunrise Formation.

This site has attracted international attention because it is among the best-documented T/J sections in North America. The coral occurrences in this section are near the T/J boundary, making the Nevada site ideal for understanding the dynamics of coral recovery and comparing them with the Tethys.

The authors write that these New York Canyon corals offer additional information on recovery in eastern Panthalassa along the craton of North America. "Paleogeographically, the New York Canyon corals show a strong connection with the Tethys, but in contrast are exclusively solitary and exclusively stylophyllid taxa. Hettangian corals are unknown from North America, so for the present, the New York Canyon site may be the earliest North American Jurassic example."

According to Hodges and Stanley, analysis of these corals fills a neglected but important part of the T/J recovery phase in North America, while lending support for an earlier opening of the Hispanic Corridor.

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Story Source:

The above post is reprinted from materials provided byGeological Society of America. Note: Materials may be edited for content and length.

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Journal Reference:

1.    Montana S. Hodges, George D. Stanley. North American coral recovery after the end-Triassic mass extinction, New York Canyon, Nevada, USA. GSA Today, 2015; 15 (10): 4 DOI: 10.1130/GSATG249A.1

http://www.sciencedaily.com/releases/2015/09/150929142520.htm

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