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Miguel A. Torres-Martínez

Bio: Miguel A. Torres-Martínez is an academic researcher from National Autonomous University of Mexico. The author has contributed to research in topics: Permian & Carboniferous. The author has an hindex of 5, co-authored 21 publications receiving 64 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, Dyoros (Lissosia ) maya and Hustedia shumardi are proposed as a new species of brachiopod from the Paso Hondo Formation.

12 citations

Journal ArticleDOI
TL;DR: In this paper, microfacies and geochemical analyses conducted on five stratigraphic sections in northeastern Mexico (ancentral western margin of the proto-North Atlantic) reveal major paleoenvironmental changes in shallow water and pelagic environments in the prelude and run-up of the early Aptian oceanic anoxic event (OAE) 1a.

10 citations

Journal ArticleDOI
01 Dec 2019
TL;DR: In this paper, eleven brachiopod species from the Paso Hondo Formation in the Chicomuselo region of southern Chiapas, Mexico are described, including Dyoros (Tetragonetes) rectangulatus, Costispinifera rugatula, Echinosteges tuberculatus, Tropidelasma furcillatum, Acosarina rectimarginata, Tautosia transenna, Composita hapsida, and Neospirifer venezuelensis.
Abstract: Eleven brachiopod species from the Paso Hondo Formation in the Chicomuselo region of southern Chiapas, Mexico are described. Chonosteges cooperi is a new species. Dyoros (Tetragonetes) rectangulatus, Costispinifera rugatula, Echinosteges tuberculatus, Tropidelasma furcillatum, Acosarina rectimarginata, Tautosia transenna, Composita hapsida, and Neospirifer venezuelensis are recorded for the first time in Mexico. The brachiopods occur in a locality to the east of the town of Monte Redondo, deposited in limestone and argillaceous limestone. The associated biota is composed of different filter feeders, with diverse invertebrates (rugose corals, microconchids, hederelloids, bryozoans, and crinoids) recorded. Lithological traits and features of the fossils allowed the facies to be assigned to a shallow open marine paleoenvironment, within a homoclinal ramp. Brachiopods recorded at the locality allow the upper levels of the Paso Hondo Formation to be correlated with the Cherry Canyon and Road Canyon formations of Texas in the United States, which have been characterized as typical stratigraphic units from the Guadalupian of North America. This information indicates that the age of the Paso Hondo Formation can be extended from the Early Permian to the Roadian (early Guadalupian), making this the first report of a formation of this age in southeastern Mexico. The presence of typical taxa from the Middle Permian in both Chiapas and Texas suggests that those regions were closely connected during the late Paleozoic, at least during the early Guadalupian. The similarity of Mexican biota to coeval faunas of Texas indicates that the brachiopods found in Chiapas occurred in the Grandian Province during the Middle Permian, which also included Texas and New Mexico, Guatemala, Venezuela, and northwest Mexico.

10 citations

Journal ArticleDOI
TL;DR: In this article, a sclerobiont association from the Paso Hondo Formation (Roadian, middle Permian), Chiapas, Mexico is described, which is similar to those recorded in different Devonian localities, especially by the cooccurrence of microconchids, hederelloids, and bryozoans.
Abstract: This paper describes a sclerobiont association from the Paso Hondo Formation (Roadian, middle Permian), Chiapas, Mexico. Different marine invertebrates such as hederelloids, microconchids, bryozoans, and crinoids (represented by holdfasts) encrusted brachiopod shells belonging to Athyridida and Rhynchonellida. This association is similar to those recorded in different Devonian localities, especially by the co-occurrence of microconchids, hederelloids, and bryozoans. Paleoecological analysis revealed that bryozoans were the most abundant sclerobionts, whereas crinoid holdfasts were uncommon. Likewise, hederelloids and microconchids often settled on hosts previously colonized by bryozoans. Most microconchids encrusted rhynchonellid shells. A positive correlation between the size of the hosts and abundance/diversity of sclerobionts was recorded. The distribution analysis suggests that sclerobiont colonization could have been influenced either by inhalant currents of brachiopods, time of exposure, position of hosts, or by combination of all these factors. Moreover, most of commissures and foramens of brachiopods were not covered by epibionts, suggesting that there was a live interaction. Thus, studied brachiopods were likely encrusted syn vivo, and the interaction between sclerobionts and their brachiopod hosts was likely commensal since there is no damage to the brachiopod valves in the form of malformations or borings. On the contrary, the epibiont cover might have served as a natural shield against predators and parasites. The Roadian age of the association is based on the stratigraphic distribution of host brachiopods. The studied association inhabited open waters on a homoclinal carbonate ramp in the Chicomuselo region. Although encrusted brachiopods belong to the biotic Grandian Province, similar sclerobiont communities have not been previously recorded from the Permian of North America or beyond. The described community represents the youngest record of co-occurring microconchids, hederelloids, and bryozoans, as all previously known similar communities originate from the Late Devonian.

9 citations

Journal ArticleDOI
TL;DR: A microfacies analysis carried out on the carbonate rocks of a stratigraphic section, allowed for the first time the recognition of the depositional conditions that prevailed in the Chicomuselo region at the end of the Cisuralian as mentioned in this paper.

9 citations


Cited by
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Journal Article
TL;DR: In this article, the Apennine Carbonate Platform of southern Italy was used to test the hypothesis of surface water ocean acidification by presenting data from a resilient carbonate platform.
Abstract: Abstract The early Toarcian oceanic anoxic event (Early Jurassic;∼183 Myr ago) is associated with one of the largest negative carbon isotope excursion (CIE) in the whole Phanerozoic (3–7‰). Estimates of the magnitude and rate of CO 2 injection in the ocean–atmosphere system are compatible with a scenario of ocean acidification. Many carbonate platforms drowned in the Pliensbachian, well before the early Toarcian event. In this paper we test the hypothesis of surface water ocean acidification by presenting data from a resilient carbonate platform: the Apennine Carbonate Platform of southern Italy. The studied sections document a dramatic shift of the carbonate factory from massive biocalcification to chemical precipitation. Lithiotis bivalves and calcareous algae ( Palaeodasycladus mediterraneus ), which were the most prolific carbonate producers of Pliensbachian carbonate platforms, disappear during the first phase of the early Toarcian CIE, before the most depleted values are reached. We discuss the local versus supraregional significance of this shift and propose a scenario involving abrupt decline of carbonate saturation, forced by CO 2 release at the beginning of the early Toarcian CIE, followed by a calcification overshoot, driven by the recovery of ocean alkalinity. Attribution of the demise of carbonate platform hypercalcifiers to ocean acidification is supported by palaeophysiology and reinforced by experimental data on the detrimental effects of ocean acidification on recent shellfishes and calcareous algae.

89 citations

Book ChapterDOI
01 Jan 1968
TL;DR: In this paper, the authors provided an overview of the Silurian system and found that the majority of these outcrop in the southeastern States, though their presence in the subsurface beneath the Mesozoic sediments of the Artesian Basin has been proved by deep exploratory wells in some areas.
Abstract: This chapter provides an overview of the Silurian system. Apart from relatively minor occurrences in the northern part of the Perth Basin and in the Carnarvon Basin, in Western Australia, and rather more widespread occurrences in the Amadeus Basin, the only Silurian rocks on the continent are to be found in the Tasman Orthogeosyncline. The bulk of these outcrop in the southeastern States, though their presence in the subsurface beneath the Mesozoic sediments of the Artesian Basin has been proved by deep exploratory wells in some areas. The sediments in the two Western Australian Basins are limestones, dolomites, and cross-stratified quartzose sandstones, products of deposition in broad shallow-water basins with margins of low relief. The Amadeus Basin was receiving only terrestrial sediments. In the Lachlan Geosyncline, the pattern of arches and troughs had been greatly modified during the Benambran Orogeny, the only structures that retained their characters being the Molong–Canberra High and the Melbourne Trough. Following this deformation, there was extensive acid and intermediate volcanism that seems to have been largely restricted to the deformed areas.

80 citations

Book ChapterDOI
01 Jan 2013
TL;DR: Suggestions for advancement of the knowledge and sustainable utilization of echinoderms in Mexico are discussed in the present chapter.
Abstract: Mexico is one of the most biodiverse countries on the planet. Knowledge of echinoderm diversity in Mexico started in the XIX Century with Louis Agassiz in 1841. Currently, 643 species of echinoderms are known from Mexico, with Class Ophiuroidea the richest (197 species); Class Asteroidea follows with 185 species, then Class Echinoidea with 119 species, Class Holothuroidea with 113 species, and Class Crinoidea with 29 species. The Mexican deep sea has been little studied, and most expeditions covering this area have been made by institutions in other countries where a great amount of information is deposited but access to it can be difficult. It is necessary to have available catalogues of the Mexican echinoderms with information on their biology, ecology, distribution, and fisheries, in order to facilitate access to information, and promote further studies on the echinoderms of Mexico. Fossil echinoderms are present in the sedimentary basin of Mexico and thus have potential practical use as paleoecological indicators, complementing stratigraphic studies. Although taxonomic studies have resulted in a rather large species list, ecological, life history, and other studies are scarce. Studies on sea cucumber aquaculture in Mexico have not yet started, in spite of the high market value of these animals and their detritivorous habit which makes them attractive for cultivation. It is recommended that aquaculture studies be undertaken. These and other suggestions for advancement of the knowledge and sustainable utilization of echinoderms in Mexico are discussed in the present chapter.

31 citations

Journal ArticleDOI
TL;DR: A provenance model for the Tamatan Group is proposed based on new petrological data, whole-rock geochemical data, and U-Pb LA-ICP-MS detrital zircon age data from these marine fossiliferous strata.

12 citations