新墨西哥州圣达菲县曼科斯页岩胡安娜洛佩斯段类型区的土伦菊石

P. Sealey, S. Lucas
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引用次数: 0

摘要

在新墨西哥州中部Galisteo坝Mancos页岩的Juana Lopez段的类型剖面上,该单元厚度约为33米,由三个岩石地层层段组成——下泥质岩、中泥质岩和上泥质岩。其下部为卡莱尔页岩,上覆为曼科斯页岩D-Cross段。鹦鹉螺区系包括:scapites whitfieldi Cobban, Prionocyclus novimexicanus (Marcou), Prionocyclus wyomingensis Meek, Prionocyclus macombi Meek, scapites warreni Meek and Hayden和Coilopoceras colleti Hyatt。Galisteo坝Juana Lopez段的菊石多样性主要分布在钙屑岩上段,以P. novimexicanus、S. whitfieldi和S. warreni为主,偶有P. wyomingensis。中页岩层段菊石组合多样性较低,以马孔比菊石为主,偶有colleti菊石。Juana Lopez成员包括三个被广泛认可的Turonian菊石带,P. macombi, P. wyomingensis和P. novimexicanus带。马孔比疟原虫区也出现在新墨西哥州的许多其他地方,包括科尔法克斯县胡安娜洛佩兹成员的基部,那里收集了马孔比疟原虫的样本。在新墨西哥州,P. wyomingensis区发生在胡安娜洛佩兹和D-Cross成员。novimexicanus带也出现在新墨西哥州的许多地方,特别是在Mancos页岩的D-Cross段。P. macombi和P. wyomingensis带属于Turonian中晚期,而P. novimexicanus带属于Turonian晚期
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Turonian ammonites from the type area of the Juana Lopez Member of the Mancos Shale, Santa Fe County, New Mexico
At the type section of the Juana Lopez Member of the Mancos Shale at Galisteo Dam in central New Mexico, the unit is approximately 33 m thick and consists of three lithostratigraphic intervals--lower calcarenites, a middle shale and upper calcarenites. It is underlain by the Carlile Shale and overlain by the D-Cross Member of the Mancos Shale. The ammonite fauna includes Scaphites whitfieldi Cobban, Prionocyclus novimexicanus (Marcou), Prionocyclus wyomingensis Meek, Prionocyclus macombi Meek, Scaphites warreni Meek and Hayden and Coilopoceras colleti Hyatt. Most of the ammonite diversity in the Juana Lopez Member at Galisteo Dam is in the upper calcarenite interval and is dominated by P. novimexicanus , S. whitfieldi and S. warreni with an occasional P. wyomingensis . The middle shale interval has a low diversity ammonite assemblage dominated by P. macombi with an occasional C. colleti . The Juana Lopez Member encompasses three widely recognized Turonian ammonite zones, the P. macombi , P. wyomingensis and P. novimexicanus zones. The P. macombi Zone also occurs in many other places in New Mexico, including the basal part of the Juana Lopez Member in Colfax County where the lectotype of P. macombi was collected. In New Mexico, the P. wyomingensis Zone occurs in the Juana Lopez and D-Cross Members. The zone of P. novimexicanus also occurs in various New Mexico locations, especially in the D-Cross Member of the Mancos Shale. The P. macombi and P. wyomingensis Zones are of late-middle Turonian age, whereas the P. novimexicanus Zone is of late Turonian
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