Ismael Ferrusquía-Villafranca- National Autonomous University of Mexico
Ismael Ferrusquía-Villafranca
- National Autonomous University of Mexico
About
62
Publications
15,008
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,849
Citations
Publications
Publications (62)
Mustelidae are the largest and most diverse family of carnivores, its record dates back to the Early Oligocene, and its early history occurred in western Europe; therefore, the finding of a basal mustelid in southeastern Mexico (northwestern Oaxaca) is quite important.
The material found is a very small, nearly complete skull collected from the Yol...
In this study, the first postcranial skeleton of an oreodont (Merycoidodontidae, Artiodactyla) found in Mexico is described and discussed. This family was very successful, quasi endemic of North America, and lived from the Late Duchesnean North American Land Mammal Age, acronymed NALMA (Late Eocene) to the Late Hemphillian NALMA (early Late Miocene...
For the purpose of supplementing and improving the Mexican Pleistocene vertebrate fauna knowledge, the present study includes new records of the taxonomic composition of the following Rancholabrean locality: Santa Cruz Nuevo local fauna, Puebla. The following taxa are reported for the first time in the study area: cf. Stockoceros sp., Tetrameryx sp...
Limestone samples were collected from the San Juan Formation, which consists of a mixed marine and non-marine deposit located in the Tlaxiaco Basin, Oaxaca, Mexico. These beds contain a freshwater assemblage of charophyte gyrogonites and gastropods, and a shallow-water marine association with larger foraminifera Labyrinthina mirabilis Weynschenk, 1...
El presente número de Paleontología Mexicana (Vol.7, Núm. 2) se lo dedicamos a la memoria de la Dra. Alencáster debido a que, entre sus numerosas contribuciones, ella fue la fundadora de esta revista en el año de 1954. La doctora Gloria Alencáster Ybarra fue una destacada académica de la Universidad Nacional Autónoma de México, con más de 60 años d...
The Yolomécatl area, northwestern Oaxaca, Sierra Madre del Sur Morphotectonic Province, Mexico, lies between 17°25′N and 17°30′N latitude, 97°29′W and 97°36′W longitude, at 2200–2500 m above sea level, and includes ∼90 km² of rugged territory, where lithostratigraphic units of Late Jurassic to Quaternary age crop out. The Tertiary succession, which...
The discrimination/characterization of depositional systems recorded in formal lithostratigraphic, Cenozoic, continental, epiclastic units of Mexico, is largely a pending task, notwithstanding its great academic and economic importance. Contributing to fill this gap, we present a first approach to discriminate and characterize the depositional syst...
The diet and habitat of Leptomeryx sp. from the Late Uintan Yolomécatl Formation of NW Oaxaca, SE Mexico were inferred using dental enamel carbon and oxygen isotopic relationships, and compared with those of congeneric species from temperate North America. Results show that Leptomeryx sp. fed on C3 plants and lived in open forest or forest/savanna...
The Pleistocene and modern mammal faunas of southern North America strongly differ in taxonomic makeup, distribution, and physiognomy. The former faunal complexes are part of the ancient landscape in which early peoples may have interacted. Customarily, differences between the Pleistocene and modern faunas have been attributed to climate change
or...
La litoestratigrafía jurásica de la Región Mixteca es relativamente bien conocida, sin embargo, el esquema en que se basa incluye descripciones formacionales un tanto deficientes (e.g. vaguedad, caracterización por contenido fósil, delimitación cartográfica insuficiente). Con el propósito de contribuir a subsanar esta deficiencia, realizamos un est...
The Yolomécatl-Tlaxiaco Area, lies in the rugged Sierra Madre del Sur (SMS) of northwestern Oaxaca (YOTLA), southeastern Mexico. Within the area Cenozoic units unconformably overlie metamorphic, clastic and carbonate rock units of Late Paleozoic to Cretaceous ages as well as the Mixteco/Oaxaca Terrane boundary.
The Cenozoic sequence, emphasized her...
In spite of ~130 years of geologic research in Mexico, much remains pending e.g. only 1/3 of this country's territory is mapped in detail [i.e., scale 1:50000], the formal stratigraphic differentiation of the continental sedimentary Cenozoic is barely started, discriminating the depositional systems that make up basic units is even less pursued. To...
The discrimination and characterization of the depositional systems registered in the formal lithostratigraphic units of our country, is practically a pending task of Mexican Geology, notwithstanding their academical and applied importance in the investigation of placer mineral deposits and of aquifers. As a contribution to fill this gap, the depos...
The combined isotopic/paleontologic approach drove a qualitative leap in understanding Earth's geologic history/evolution, yet, in spite of its early start, it is still not widely used in Mexico. Here we report 28 sites where such an approach was applied; their space/time distribution is uneven, leaving morphotectonic provinces and/or geochronologi...
Currently the North American Stratigraphic Code, (NACSN 2005, Article 37) sets restrictions on the use of the term “complex” for lithodemic units. With exceptions for “volcanic complex” and “structural complex,” a complex must consist of more than one genetic class of rock (i.e., sedimentary, igneous or metamorphic). Thus, the use of the term “comp...
Mexico's Late Neogene mammal faunas are largely known from localities in the Trans-Mexican Volcanic Belt; those from other morphotectonic provinces are few and far apart. Thus, the discovery of Late Miocene vertebrates in western Sierra Madre Oriental at San Luis Potosí, the Paso del Águila local fauna, significantly adds to this meager record. The...
La detección, y caracterización de las discontinuidades geológicas que acusa el registro litoestratigráfico mesozoico de la Sierra de Chiapas, fue posible en gran parte por el influjo de la doctora Alencáster en los geólogos de Petróleos Mexicanos, Distrito de Exploración Zona Sur, a lo largo de la década y algo más [~1969-1982] en que colaboró est...
Equine material recovered from the Middle Miocene El Camarón andMatatlán Formations (both KAr dated ca. 15 Ma, late Early Barstovian) of Oaxaca, southeastern Mexico, is formally described. It consists of isolated upper and lower cheek teeth, whose occlusal patterns and tooth dimensions closely resemble those of Pliohippus, although no positive spe...
Mexico's Pleistocene terrestrial mammal record includes 13 orders, 44 families, 147 genera and 280 species, thus is comparable to the Recent one, but shows greater ordinal and family diversity. Post-Pleistocene extinction chiefly involved meso- and megabaric species. The mammal, palynologic and paleosol records are strongly time and space biased in...
Analysis of the overall fossil record for specific regions in order to examine paleobiological data requires assembling enormous amounts of information in databases. Geoinformatics involves the management and analysis of such databases. A case in point is the Quaternary Mexican mammal database, currently composed of more than 15,000 records for 12...
Equine material recovered from the Middle Miocene El Camarón and Matatlán Formations (both K-Ar dated ca. 15 Ma, late Early Barstovian) of Oaxaca, southeastern Mexico, is formally described. It consists of isolated upper and lower cheek teeth, whose occlusal patterns and tooth dimensions closely resemble those of Pliohippus, although no positive sp...
Information on Mexico's middle Miocene mammal record improves understanding of the southern extent, makeup, and relationships of North American Tertiary faunas. The Hemingfordian–Barstovian combined assemblage (= HBCA) in Mexico records 6 orders, 17 families, and 35 genera, each represented probably by a single species known from sites in Baja Cali...
Simojovelhyus pocitosense, gen. et sp. nov., is based on a mandibular fragment with m1–3 collected from an unnamed Late Oligocene formation, in an amber mine near Simojovel, in northwestern Chiapas. The source strata consist of black, very fossiliferous, shaley phyllarenitic sandstone and mudstone that were deposited in an estuarine to swampy lagoo...
It has been recommended that geological time be described in a single set of terms and according to metric or SI ("Système International d'Unités") standards, to ensure "worldwide unification of measurement". While any effort to improve communication in sci- entific research and writing is to be encouraged, we are also concerned that fundamental di...
The Geological Society of London Proposal for "...ending the distinction between the dual stratigraphic terminology of time-rock units (of chronostratigraphy) and geologic time units (of geochronology). The long held, but widely misunderstood distinction between these two essentially parallel time scales has been rendered unnecessary by the adoptio...
Hipparionin material recovered from the middle Miocene El Camarón Formation (late early Barstovian, K-Ar dated 15. 0 ± 0.8 to 16.7 ± 0.71 Ma) of the state of Oaxaca, southeastern Mexico, is formally described. The sample consists of upper and lower cheek teeth, whose sizes and occlusal patterns are closest to those of the North American Cormohippar...
Mexican material referable to Merychippus from two localities in eastern Oaxaca was described first nearly 50 years ago. Subsequent work there and in Central Oaxaca, spanning some 30 years, has allowed to establish the detail stratigraphy in both regions, and assembled a collection of merychippine material from the Matatlán (Central Oaxaca) and El...
R. Michael Easton, born in Toronto, has been a geologist with the Ontario Geological Survey since 1982, after studying at the University of Western Ontario (B.Sc. 1972), University of Hawaii, (M.Sc. 1976), and Memorial University of Newfoundland (Ph.D. 1982). He specializes in Proterozoic geology, with an emphasis on chronology, stratigraphy, and m...
La Formación Suchilquitongo al noroeste del Valle de Oaxaca consiste en una secuencia gruesa integrada por varios estratos delgados de colores luminosos, areniscas y limolitas. Esta secuencia contiene localmente a la fauna mamífera Hemingfordian. Contiene también lechos intercalados de calizas lacustres y tobas verdes y grises (Ignimbrita Etla). Af...
The area lies between 16º35'-16º45' N Lat. and 93º00'-93º10' W Long; and consists of 323.3 km2 of moderately rugged terrain set between 380-1,240 mamsl, formed by these units: Sierra Madre Limestone (Middle Cretaceous, light olive gray, thick bedded biomicrite, 800 m thick occurring in the southwest), Angostura Formation (Late Cretaceous, light gra...
La Mesa de Copoya Selachifauna, middle Eocene San Juan Formation, the Tuxtla Gutiérrez-Chiapa de Corzo-Suchiapa area, west-central Chiapas, southeastern Mexico, consists of these taxa: Nebrius sp., Strilatolamnia macrota, Carcharias sp., Odontaspis? sp., Isurus cf., I. praecursur, Carcharodon auriculatus, Hemipristis sp., Galeocerdo sp., an indeter...
The Mexican territory has been divided into 11 morphotectonic provinces that have physiographic and geologic-tectonic features distinctive enough to individualize them from such other neighboring ones. The relief, dominated by mountains, is rugged. The geological composition is varied and complex comprising sedimentary, volcanic, intrusive, and met...
The Ixtapa-Soyaló area is located in northwest Chiapas, some 30 kms ENE of Tuxtla Gutiérrez, the state capital. The Tertiary sequence occupies a NW-SE trending graben limited by the Cretaceous Ocozocuautla Group -limestones and marls- it includes from base to top these units: The Paleocene- early Eocene Rio Sabinal Group-marine shales and siltstone...
The areas and faunas treated in this part of the study are: (1) Suchilquitongo, northwestern Oaxaca Valley; (2) Matatlán, southeastern Oaxaca Valley; and (3) Nejapa, eastern Isthmus of Tehuantepec region.In Suchilquintongo, the Tertiary sequence unconformably overlies a basement formed by the Proterozoic Oaxaca Complex (schistous and gneissic bodie...
The continental Cenozoic of this country is very extensive, holds important natural resources, and sustains much of the environmental impact; yet it remains geologically poorly known. Scarcity of time markers and very limited detailed mapping have hampered the studies on this subject. In an effort to improve the knowledge on the Tertiary, the avail...
A diverse assemblage of mammalian and other vertebrate taxa has been recovered from the Lomas Las Tetas de Cabra in Baja California Norte, Mexico. Early reports proposed a late Paleocene to early Eocene age for this fauna. This correlation is supported by recent analysis of the marine section adjacent to the Tetas de Cabra sequence and paleomagneti...
The early and middle Tertiary land-mammal record of Mexico includes five local faunas, two faunules and four isolated occurrences that range from ?late Paleocene to late Miocene and includes 10 orders, 24 families and 36 genera (both determined and inferred) from localities in eight states throughout the country. They show a mixture of endemic and...
Atlas de México organizado en tres volúmenes que integran siete temas: mapas generales, historia, sociedad, naturaleza, medio ambiente, economía y México en el Mundo. La carta presente zonifica el territorio nacional en provincias bióticas, con énfasis en criterios morfotectónicos.
