巴西Sergipe-Alagoas盆地Turonia-Coniacian地层的Mecaster texanus（Echinoidea）

IF 1.5 4区地球科学 Q2 GEOLOGY

Carnets De Geologie Pub Date : 2017-12-24 DOI:10.4267/2042/64287

C. L. C. Manso, W. Souza-Lima

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引用次数: 3

摘要

蛛形棘足类Mecaster texanus (Roemer)首次在美国德克萨斯州的Austin Chalk被发现。在巴西东北部，该物种记录于Potiguar盆地上白垩统(Turonian-Coniacian) Jandaira组。在这里，我们将M. texanus的古地理分布向南扩展到Sergipe-Alagoas盆地，该物种出现在Turonian-Coniacian Cotinguiba组。本文补充了Sergipe-Alagoas盆地白垩纪-新生代层序中蛛形类的鉴定要点，并对该盆地其他蛛形类的鉴定提出了考虑。

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Mecaster texanus (Echinoidea) from Turonian-Coniacian strata in the Sergipe-Alagoas Basin, Brazil

The spatangoid echinoid Mecaster texanus (Roemer) was first described from the Austin Chalk in Texas (USA). In northeast Brazil, this species was recorded from the Upper Cretaceous (Turonian-Coniacian) Jandaira Formation in the Potiguar Basin. Here we extend the palaeogeographical distribution of M. texanus southwards to the Sergipe-Alagoas Basin, where this species occurs in the Turonian-Coniacian Cotinguiba Formation. A key to identification of spatangoids from the Cretaceous-Cenozoic sequence at Sergipe-Alagoas is added and considerations about other spatangoid species from that basin are presented.

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