The ammonite record of two stratigraphic sections, La Boca Canyon and La Huasteca Canyon, of the La Peña Formation in Nuevo León State, northeast Mexico, was studied in this work. In Mexico, ammonite provincialism during the Aptian prevents the use of European zonations. We followed previous works where we proposed the critical need to define an independent ammonite zonation for the Central Atlantic Province. The current study constitutes an advance in the development of an Aptian ammonite zonation for Mexico. The methodology employed is the usual in this kind of contribution, but two additional methodologies must be highlighted, a semi-quantitative biostratigraphy and the use of 3D models in showing the more relevant specimens. These methodologies are not new, but are uncommon in the contributions of the majority of the Lower Cretaceous ammonite workers, and can be an interesting example to follow. Three ammonite zones and one subzone were recognized: Dufrenoyia justinae interval Zone, Caseyella aguilerae interval Zone, Kazanskyella minima interval Zone and Dufrenoyia scotti/Burckhardtites nazasensis concurrent range Subzone. In addition, taxonomic contributions in some species of the genera Cheloniceras, Epicheloniceras and Kazanskyella have been made. The lower/upper Aptian transition in Mexico and Europe is discussed. Several options of study have been proposed in order to better characterize the lower/upper Aptian transition in Europe and its correlation with Mexico. This work aims at stabilizing the Mexican zonation and its applicability/reproducibility for the whole Central Atlantic Province.

这项工作研究了墨西哥东北部新莱昂州 La Peña 组的两个地层剖面的菊石记录，La Boca Canyon 和 La Huasteca Canyon。在墨西哥，阿普蒂安时期的菊石地方主义阻止了欧洲分区的使用。我们遵循了先前的工作，提出了为中大西洋省定义一个独立的炸药区带的关键需求。目前的研究构成了墨西哥阿普提亚菊石分带发展的进步。这种方法通常采用这种方法，但是必须强调另外两种方法，即半定量生物地层学和使用3D模型显示更相关的标本。这些方法并不新鲜 但在大多数下白垩世菊石工人的贡献中并不常见，可以作为一个有趣的例子。确认了三个菊石带和一个子带：Dufrenoyia justinae区间带、Caseyella aguilerae区间带、Kazanskyella minima区间带和Dufrenoyia scotti / Burckhardtites nazasensis并发范围亚区。此外，在Cheloniceras、Epicheloniceras和Kazanskyella属的一些物种中的分类学贡献已经完成。讨论了墨西哥和欧洲的下/上 Aptian 过渡。为了更好地描述欧洲下/上阿普蒂安过渡及其与墨西哥的相关性，已经提出了几种研究方案。这项工作旨在稳定墨西哥的分区及其对整个中大西洋省的适用性/再现性。