Stratigraphy of the Albian−Cenomanian boundary interval in the Agadir Basin, Morocco: ammonites, microcrinoids, planktonic foraminifera

IF 1.1 4区 地球科学 Q3 GEOLOGY Acta Geologica Polonica Pub Date : 2023-07-20 DOI:10.24425/agp.2020.134560
A. Gale, W. Kennedy, M. Petrizzo
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引用次数: 1

Abstract

Gale, A.S., Kennedy, W.J. and Petrizzo, M.R. 2021. Stratigraphy of the Albian−Cenomanian boundary interval in the Agadir Basin, Morocco: ammonites, microcrinoids, planktonic foraminifera. Acta Geologica Polonica, 71 (4), 453–480. Warszawa. The uppermost Albian and lowermost Cenomanian succession at Abouda Plage, north of Agadir, in the Agadir Basin, western Morocco, is described in detail, and ammonites, microcrinoids and planktonic foraminifera are recorded and illustrated. The lower part of the Aït Lamine Formation yields ammonites indicative of the Pervinquieria (Subschloenbachia) rostrata and P. (S.) perinflata ammonite zones, and the Thalmanninella appenninica planktonic foraminiferan Zone. The base of the Cenomanian is identified at 42.2 m above the base of the Aït Lamine Formation, based on the lowest occurrence of the planktonic foraminiferan Thalmanninella globotruncanoides Sigal, 1948. Lower Cenomanian ammonites of the Graysonites adkinsi Zone enter 3 m higher in the succession. Microcrinoid zones AlR11 and AlR12 are identified in the Upper Albian, and the base of the CeR1 Zone coincides with the lowest occurrence of Cenomanian ammonites. The ammonite and microcrinoid occurrences and detailed distributions are very similar to those found in north central Texas, which, in the Cenomanian, was 5,300 km to the west. The new records suggest that the G. adkinsi Zone is equivalent to the uppermost (Lower Cenomanian) part of the Pleurohoplites briacensis Zone of the Global Stratotype Section for the base of the Cenomanian stage. An hiatus, of global extent, immediately underlies the base of the G. adkinsi Zone and is represented in the Agadir Basin by an erosion surface containing bored and encrusted hiatus concretions.
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摩洛哥阿加迪尔盆地阿尔比阶-塞诺曼阶边界层段地层:菊石、微类、浮游有孔虫
Gale, a.s., Kennedy, W.J.和Petrizzo, M.R. 2021。摩洛哥Agadir盆地Albian - Cenomanian边界层间地层学:菊石、微海鲷、浮游有孔虫。地质学报,71(4),453-480。华沙。详细描述了摩洛哥西部阿加迪尔盆地阿加迪尔北部的Abouda Plage的最上层Albian和最下层Cenomanian演替,并记录和说明了菊石、微海鹦鹉螺和浮游有孔虫。Aït Lamine组下部为Pervinquieria (Subschloenbachia) rostrata和P. (S.) perinflata菊石带和Thalmanninella appenninica浮游有孔虫带。根据1948年浮游有孔虫Thalmanninella globotruncanoides信号的最低出现率,在Aït Lamine组底部上方42.2 m处确定了Cenomanian的底部。格雷森岩adkinsi带的下格诺曼尼亚期菊石在演替中升高了3 m。上阿尔贝统发育微海晶石带AlR11和AlR12,其中CeR1带的基底与塞诺曼尼亚期菊石的最低产状相吻合。菊石和微海晶石的产状和详细分布与位于西5300 km处的美国德克萨斯州中北部的Cenomanian地区非常相似。新记录表明,G. adkinsi带相当于全球层型剖面中briacensis Pleurohoplites带的最上端(下Cenomanian)部分,为Cenomanian阶段的基底。一个全球范围的裂谷,紧接在G. adkinsi带的底部,在Agadir盆地中表现为一个侵蚀面,其中包含钻孔和结壳的裂谷固结物。
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来源期刊
Acta Geologica Polonica
Acta Geologica Polonica 地学-地质学
CiteScore
1.70
自引率
18.20%
发文量
0
审稿时长
>12 weeks
期刊介绍: Acta Geologica Polonica publishes original and review papers on all aspects of basic geology, with particular focus on sedimentology, stratigraphy, palaeontology, regional geology, structural geology, and regional petrography. All papers are published in English.
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