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A proposed GSSP for the base of the Middle Ordovician Series： the Huanghuachang section,Yichang, China

Episodes 2005年第2期28卷 105-117页

作者： XiaofengWang SvendStouge Bernd-D.Erdtmann XiaohongChen ZhihongLi ChuanshangWang QingluanZeng ZhiqiangZhou HuimingChen YichangInstituteofGeology＆MineralResources YichangHubei443003China GeologicalMuseum UniversityofCopenhagenΦsterVoldgade5-7DK-1350CopenhagenKDenmark. InstitutfuerAngewandteGeowissenschaften TechnicalUniversityBerlinGermany. Xi＇anInstituteofGeology＆MineralResources Xi＇anShangxi710054China.

The Huanghuachang section near Yichang, southern China meets the requirements of Global Stratotype Section and Point (GSSP) for the base of the Middle Ordovician Series and the yet-to-be-named third stage of the Ordovician System (or lower stage of Middle Ordovician Series). The conodont succession at the section is complete across the Lower to Middle Ordovician series boundary and several excellent phylogenetic lineages of Baltoniodus, Trapezognathus, Periodon, and Microzarkodina are represented. The definition of the base of the Middle Ordovician is proposed to be the first appearance datum (FAD) of Baltoniodus? triangularis in the section. It is followed closely by the FAD of Microzarkodina flabellum, which is taken as a reasonable proxy for the boundary. This level approximates the boundary between the lower and upper intervals of the Azygograptus suecicus graptolite Biozone, and nearly coincides with the base of the Belonechitina henryi chitinozoan *** proposed GSSP for the base of the international Middle Ordovician Series is located in a roadside exposure at the base of Bed (SHod) 16, 10.57 m above the base of the Dawan Formation in the measured Huanghuachang section near Yichang City, southern China. The same faunal succession is also recorded from the Chenjiahe (formerly Daping) section, 5 km to the north of the Huanghuachang section. The proposed boundary horizon can be recognized and correlated globally with high precision in both relatively shallow-water carbonate facies as well as in deep-water graptolite facies.

关键词： GSSP 奥陶纪宜昌市地质分层研究地形特征

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The Global Boundary Stratotype Section and Point for the base of the Turonian Stage of the Cretaceous： Pueblo, Colorado, U.S.A.

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Episodes 2005年第2期28卷 93-104页

作者： W.J.Kennedy I.Walaszczyk W.A.Cobban GeologicalCollections OxfordUniversityMuseumofNaturalHistoryParksRoadOxfordOXl3PWUnitedKingdom InstituteofGeologyoftheUniversityofWarsaw A1.ZwirkiIWigury9302-089WarszawaPoland 70EstesStreet LakewoodColorado80226USA

Following the recommendation of the International Commission on Stratigraphy (16 votes Yes [94%], 1 abstention, 2 votes not received), the Global boundary Stratotype Section and Point (GSSP) for the base of the Turonian Stage of the Cretaceous System is defined as the base of bed 86 of the Bridge Creek Limestone Member of the Greenhorn Limestone Formation at the western end of the Denver and Rio Grande Railroad cut near the north boundary of the Pueblo Reservoir State Park Recreation Area, west of Pueblo, Colorado, USA. This GSSP horizon is also exposed and protected in the adjacent state recreation area. It coincides with the first occurrence of the ammonite Watinoceras devonense, is in the middle of a global positive excursion in Carbon-13 isotopes, and is bracketed by widespread bentonites that have yield edages of 93 to 93.5 Ma.

关键词：土仑统白垩纪美国地质分层研究科罗拉多州

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