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      Síntesis de los trabajos paleobotánicos del Cretácico en México Translated title: Synthesis of paleobotanic research of the Cretaceous in Mexico

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          Abstract

          Nuevas investigaciones sobre las asociaciones florísticas del Cretácico en México, revelan un panorama más completo de la flora en ese momento y de su evolución hasta la actualidad. Los escasos estudios paleobotánicos continentales existentes para el Cretácico Inferior siguen inéditos y se restringen a estudios de macroflora en Colima, Oaxaca y Puebla, citas de impresiones de hojas en Chihuahua y Sonora y trabajos palinológicos realizados en los estados de Baja California, Durango y Michoacán. La razón de la escasez de datos para este periodo se debe principalmente a que en esta época la mayor parte de México permanecía sumergida. Sin embargo, son más numerosos los trabajos de flora fósil centrados en el Cretácico Superior principalmente en la Formación Olmos (Coahuila), y en menor medida, provenientes de las formaciones Cerro del Pueblo (Coahuila), El Gallo (Baja California), Sierra Madre (Chiapas), Tarahumara, Grupo Cabullona (Sonora) y otros trabajos aislados inéditos. En esta síntesis también se incluyen nuevos datos paleobotánicos de gran relevancia del Cretácico de México, incluyendo macroflora del Cenomaniano en la localidad de El Chango (Chiapas) y registros de macro y microflora en la localidad de Esqueda en la Cuenca de Cabullona (Sonora).

          Translated abstract

          New investigations of Cretaceous floristic assemblages in Mexico reveal a more complete picture of the flora at that time and its evolution up to the present. The scarce continental paleobotanical studies for the Early Cretaceous remain unpublished and are restricted to macroflora studies in Colima, Oaxaca and Puebla, citations of leaf impressions in Chihuahua and Sonora and palynological works in the states of Baja California, Durango and Michoacan. The reason for the paucity of data for this period is mainly due to the fact that at this time most of Mexico remained submerged. In contrast, palynological studies focused on the Late Cretaceous are more numerous and are mainly centered on the Olmos Formation (Coahuila) and, to a lesser extent, there are studies from the Cerro del Pueblo (Coahuila), El Gallo (Baja California), Sierra Madre (Chiapas), and Tarahumara (Sonora) formations, the Cabullona Group (Sonora) and other isolated unpublished works. New contributions to the Cretaceous of Mexico are provided, mainly by Cenomanian macroflora from the locality of El Chango (Chiapas) and new macro- and microflora records from Esqueda in Cabullona Basin (Sonora).

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          Chronology of fluctuating sea levels since the triassic.

          Advances in sequence stratigraphy and the development of depositional models have helped explain the origin of genetically related sedimentary packages during sea level cycles. These concepts have provided the basis for the recognition of sea level events in subsurface data and in outcrops of marine sediments around the world. Knowledge of these events has led to a new generation of Mesozoic and Cenozoic global cycle charts that chronicle the history of sea level fluctuations during the past 250 million years in greater detail than was possible from seismic-stratigraphic data alone. An effort has been made to develop a realistic and accurate time scale and widely applicable chronostratigraphy and to integrate depositional sequences documented in public domain outcrop sections from various basins with this chronostratigraphic framework. A description of this approach and an account of the results, illustrated by sea level cycle charts of the Cenozoic, Cretaceous, Jurassic, and Triassic intervals, are presented.
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            Angiosperm pollen zonation of the continental cretaceous of the Atlantic coastal plain and its application to deep wells in the Salisbury embayment

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              Araceae from the Early Cretaceous of Portugal: evidence on the emergence of monocotyledons.

              A new species (Mayoa portugallica genus novum species novum) of highly characteristic inaperturate, striate fossil pollen is described from the Early Cretaceous (Barremian-Aptian) of Torres Vedras in the Western Portuguese Basin. Based on comparison with extant taxa, Mayoa is assigned to the tribe Spathiphylleae (subfamily Monsteroideae) of the extant monocotyledonous family Araceae. Recognition of Araceae in the Early Cretaceous is consistent with the position of this family and other Alismatales as the sister group to all other monocots except Acorus. The early occurrence is also consistent with the position of Spathiphylleae with respect to the bulk of aroid diversity. Mayoa occurs in the earliest fossil floras (from circa 110 to 120 million years ago) that contain angiosperm flowers, carpels, and stamens. The new fossil provides unequivocal evidence of monocots in early angiosperm assemblages that also include a variety of key "magnoliid" lineages (e.g., Chloranthaceae) but only a limited diversity of eudicots.
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                Author and article information

                Journal
                bsgm
                Boletín de la Sociedad Geológica Mexicana
                Bol. Soc. Geol. Mex
                Sociedad Geológica Mexicana A.C. (Ciudad de México, Ciudad de México, Mexico )
                1405-3322
                2014
                : 66
                : 1
                : 97-121
                Affiliations
                [02] México D.F. orgnameUniversidad Nacional Autónoma de México orgdiv1Instituto de Geología orgdiv2Departamento de Paleontología México
                [01] Hermosillo Sonora orgnameUniversidad Nacional Autónoma de México orgdiv1Instituto de Geología orgdiv2Estación Regional del Noroeste México uxue@ 123456geologia.unam.mx
                Article
                S1405-33222014000100009 S1405-3322(14)06600100009
                6ec73d12-1e54-472a-a7d8-d611b76d28a0

                This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

                History
                : 05 May 2013
                : 24 January 2013
                : 01 April 2013
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 246, Pages: 25
                Product

                SciELO Mexico

                Categories
                Artículos

                Paleobotany,paleopalynology,Cretaceous,Mexico,Paleobotánica,paleopalinología,Cretácico,México

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