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

作     者：W.J.Kennedy I.Walaszczyk W.A.Cobban 

作者机构：GeologicalCollectionsOxfordUniversityMuseumofNaturalHistoryParksRoadOxfordOXl3PWUnitedKingdom InstituteofGeologyoftheUniversityofWarsawA1.ZwirkiIWigury9302-089WarszawaPoland 70EstesStreetLakewoodColorado80226USA 

出 版 物：《Episodes》 (地质幕（英文版）)

年 卷 期：2005年第28卷第2期

页      面：93-104页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

主　　题：土仑统 白垩纪 美国 地质分层研究 科罗拉多州 

摘      要：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.