Research-paper
Middle to Late Albian Biostratigraphy of the Cuchillo Formation from Sierra De Sapell„, Mexico
Al-Rifaiy, I.; Varol, O.; Lemone, D.
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Abstract
A middle to late Albian age is assigned to the upper part of the Cuchillo Formation based on the combined evidence of calcareous nannofossils, planktonic foraminifera and calpionellids. The upper part of the Cuchillo Formation, from Sierra de Sapell„, Mexico, is assigned to the Perediscosphaera columnata (CC8) and Eiffellithus turriseiffelii (CC9) calcareous nannofossil zones of middle and late Albian age respectively. Planktonic foraminifera and Calpionellids support this age assignment. The new nannofloral species Calculites dispar, Orastrum partitum and Orastrum perspicuum are described.