A5009516157- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Microbial Community Ecology and Physiology
- Diatoms and Algae Research
- Biocrusts and Microbial Ecology
- Geochemistry and Elemental Analysis
- Geological and Geochemical Analysis
- Genomics and Phylogenetic Studies
- Plant Diversity and Evolution
- Botanical Research and Applications
- Methane Hydrates and Related Phenomena
- Cephalopods and Marine Biology
- Geological and Geophysical Studies Worldwide
- Marine and environmental studies
- Ichthyology and Marine Biology
- earthquake and tectonic studies
- Lichen and fungal ecology
- Geological and Tectonic Studies in Latin America
- Botany, Ecology, and Taxonomy Studies
- Geochemistry and Geologic Mapping
- Fish biology, ecology, and behavior
- Evolution and Paleontology Studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Aquatic Invertebrate Ecology and Behavior
- Plant and animal studies
Universidad Nacional Autónoma de México
2002-2022
Universidad Autónoma de la Ciudad de México
2018
Czech Academy of Sciences, Institute of Geology
2006-2016
Arizona State University
2005-2010
Biological soil crusts (BSCs) are topsoil biosedimentary structures built by photosynthetic microbes commonly found today on arid soils. They play a role in stabilization and the fertility of lands, considered modern analogues ancient terrestrial microbial communities. We determined concentrations four biogenic 21 other elements, mostly metals, surface soils that hosted BSCs, underneath those crusts, proximate but non-crusted The samples were from six sites Colorado Plateau highlands Sonoran...
Terrestrial ecosystems have been largely regarded as plant-dominated land surfaces, with the earliest records appearing in early Phanerozoic (<550 Ma). Yet presence of biological components pre-Phanerozoic rocks, habitats different soils, peats, ponds, lakes, streams, and dune fields, implies a much earlier type terrestrial ecosystems. Microbes were abundant by ~3,500 Ma ago surely adapted to live subaerial conditions coastal inland environments, they do today. This enormous capacities for...
Research Article| March 01, 2002 70 Ma nonmarine diatoms from northern Mexico Elizabeth Chacón-Baca; Chacón-Baca 1Instituto de Geología, Universidad Autónoma México, Circuito la Investigación Científica, México D.F. 04510, Search for other works by this author on: GSW Google Scholar H. Beraldi-Campesi; Beraldi-Campesi S.R.S. Cevallos-Ferriz; Cevallos-Ferriz A.H. Knoll; Knoll 2Botanical Museum, Harvard University, Cambridge, Massachusetts 02138, USA S. Golubic 3Department of Biology, Boston...
Microbial communities developing on modern clastic sedimentary surfaces of arid lands are dominated by phototrophic microorganisms that form a variety characteristic “microbially induced structures” (MISS) through their interactions with detrital grains, aided secretions extracellular polymeric substances and other organic materials. In this study, we describe MISS from unvegetated topsoils compare them fossil found within decimeter- to meter-thick sequences Mesoproterozoic siliciclastic...
Roll-up structures (Roll-ups) are sedimentary formed by the desiccation-mediated curling of a surface, cohesive layer into subcylindrical, coiled shape. Their origin in terrestrial environments has been attributed to shrinking effect argillaceous components, while microbes thought be agent intertidal marine settings. Roll-ups also exist and rock record, but their genesis is unclear. Proving biogenic roll-ups would make them excellent biosignatures track ancient life on land. In this study,...
Aiming to characterize the bacterial diversity of modern tufa systems Iberian Range (Spain), we surveyed 16S rRNA gene sequence from 24 sites within three rivers (Añamaza, Mesa and Piedra). These tufas record substantial calcareous growth under different physicochemical conditions are part an important, regional landscape-building system. The community structure composition, richness were quantified denaturing gradient gel electrophoresis fingerprints. Retrieved DNA sequences could be...
Siliceous, opal-A speleothems of the Chimalacatepec lava tube system in central Mexico are characterized here for first time. Morphologically, they can be classified into cylindrical and planar, display a wide array shapes, inner textures, locations within tube. All analyzed composed opal-A, their pores filled with calcite monohydrocalcite. Microscopic examination reveals variety microbial-looking, silicified filaments cell casts embedded micro lamination structures. The abundance biofilms...
The Naica Underground System (NUS) in Northern Mexico comprises a lead, zinc, and silver producing mine displays the largest gypsum crystals ever found natural caves. caves are now closed to public mining activities have been suspended for an undefined period since October 2015. Besides its geological, economical, tourist importance, bacterial diversity NUS has not fully explored yet. This study surveyed bacteria present on different mineral substrates (gypsum crystals, iron oxide crusts)...
Paleobotany bears an invaluable source of knowledge for understanding the history biodiversity that we protect and care today. This discipline is recognized as a information on physical, ecological, biological events processes occurred in past are maintained today, but whose occurrences must be interpreted necessarily, sometimes with limitations, solely from lithosphere. The importance studying life Mexico addressing fossil plant reconstruction highlighted to understand modern biodiversity....
Background. The Mesa River (MR) in the Iberian Range (Spain) displays prominent, Pleistocene to present-day fluvialtufa deposits. Little of their associated microbiota has been studied date despite regional and historical relevanceof these calcareous buildups. Goals. This paper is a preliminary exploration diatom (Bacillariophyta) generaassociated with actively-growing tufa from 10 benthic environments along 24 km River. Methods. Brightfieldmicroscopy, as well consultation specialists...
Abstract Rincón de Parangueo is a Quaternary maar that has been recently desiccated. The crater was partially occupied by soda lake, and near the shoreline microbialites have formed. Evaporites (mainly trona halite) precipitated as water level dropped. Active subsidence of lake floor ( c. 24 m since 1980) produced countless structures close to lakeshore, where deformation extensional. Closer depocentre, in western half basin, gliding/spreading folds mud-injection domes. most remarkable...
The Cintura Formation of Albian–Cenomanian age in the Cabullona Basin yielded an important fossil flora, including palynomorphs, leaf impressions and trunks. At base Marquechi Member a poorly preserved palynomorph assemblage is recognised. palynological dominated by gymnosperms, mainly cheirolepidiacean genus Classopollis. A noteworthy feature presence angiosperm pollen grains genera Clavatipollenites, Retimonocolpites Tucanopollis. rich, diverse well-preserved macroflora has been observed...
Recently discovered oncolites from a Lower Cambrian locality in San José de Gracia (SJG), Sonora (Mexico), illustrate the wide geographic distribution that they had this part of Laurentia some 515–510 Ma ago. They are exceptionally large (~44 mm) comparison to other marine forms North American Carbonate Bank, but similar their overall morphology and depositional environment. Their association with abundant biomorphs, especially indigenous filamentous structures curvature spatial arrangement...
As technology advances, we have more possibilities to search for past life, looking biosignatures in the rock record. Even when these can be chemical compounds, irrevocable evidence of life would itself preserved as fossils. Besides pure shape, extra information such paleoenvironment, biotic associations, and age rocks, retrieved from fossils understand their significance context which they developed. However, much that is rarely well preserved, giving a wide range speculation. Furthermore,...