Revision of Valanginian Steinmanellinae bivalves from the Neuquen basin, West-central Argentina, and their biostratigraphic implications

被引:8
作者
Lazo, Dario G.
Luci, Leticia [1 ]
机构
[1] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Inst Estudios Andinos Don Pablo Groeber, Dept Ciencias Geol, Buenos Aires, DF, Argentina
关键词
Steinmanella; Agrio Formation; Valanginian; Biostratigraphy; Trigonioida; LOWER CRETACEOUS AMMONITES; CRICKMAY BIVALVIA; AGRIO FORMATION; TRIGONIOIDA;
D O I
10.1016/j.cretres.2013.07.004
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
We present a new species of Steinmanella Crickmay from the Valanginian of the Neuquen Basin, west-central Argentina, and at the same time update a Valanginian-earliest Barremian bivalve zonation which is integrated into the local, Chilean and European standard ammonoid zonations. Steinmanella caicayensis sp. nov. presents a moderately inflated shell, a subtriangular outline, well-developed carinae and a straight to moderately convex anterior margin. Steinmanella is very abundant in the Tithonian-Barremian interval in the basin and thus provides an ideal opportunity to perform detailed taxonomic and stratigraphic studies; a former zonation based on these trigonioids is here revised and expanded with a thorough revision of Valanginian occurrences based on new material. Two new zones are proposed, namely the S. quintucoensis and S. caicayensis zones, encompassing Valanginian times. The proposed bivalve zonation encompassing the Valanginian-earliest Barremian time interval can be useful in correlating with other southwestern Gondwanan regions, such as Peru, Chile, South Africa, Tanzania, and India, where Steinmanella has been recorded. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:60 / 75
页数:16
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