Fernando Pérez ValeraUniversity of Alicante | UA · Earth and Environmental Sciences
Fernando Pérez Valera
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Publications (94)
A new Triassic small marine reptile has been found in the locality of Cehegín (Murcia, Southeastern Spain). The fossil remains mainly comprise moulds of the bones and some osseous fragments still embedded in the rock. These correspond to an articulated sauropterygian, being distinguishable the cervical vertebrae in one rock, while the other rock pr...
Rotations of large-scale crustal blocks deduced from paleomagnetism are usually invoked to support evolutionary tectonic models in orogens. However, the regional representativeness of local paleomagnetic rotations strongly depends on the structural context and can lead to conflicting results. This work analyzes an unusual cluster of almost coeval l...
Located in northern Dominican Republic, the Early Cretaceous Rio Boba mafic‐ultramafic plutonic sequence constitutes a lower crust section of the Caribbean island arc, made up by gabbroic rocks and subordinate pyroxenite. Modal compositions, mineral chemistry, whole‐rock compositions and thermobarometric calculations indicate that pyroxenites and g...
This study combines published isotope data (223 samples) with new data (153 samples) on the δ³⁴S and δ¹⁸O composition of Ca-sulfate rocks (anhydrite and secondary gypsum) accumulated in eastern Iberia during the Middle Triassic to Early Jurassic. The δ³⁴S mean values of the evaporite units reveal the following trends: a decrease from the lower Anis...
Isolated sharp-based sedimentary bodies in shelf settings can develop via the reworking of regressive deposits during transgressions. An example of these are shelf ridges, formed under a wide range of processes, and widely studied due to their high reservoir potential. However, there is still a lack of examples in mixed (carbonate-siliciclastic) su...
Isolated sharp-based sedimentary bodies in shelf settings can develop through regressions associated with abrupt lowering of relative sea level, but also via the reworking of regressive deposits during transgressions. An example of these are shelf ridges, observed in modern and ancient shelves, and formed under a wide range of mixed processes. Howe...
This paper describes various soft-sediment deformation structures present in the Triassic deposits of the Betic External Zone (Southern Iberian). These structures, together with variations in deposit thicknesses, internal angular unconformities, and synsedimentary faults, point to intense tectonic activity from the Middle to Late Triassic related t...
The lower part of the Lower Cretaceous Bolos Sandstone Formation as exposed in the Barranco de la Muela section (Sierra de la Muela Range, southeastern Spain) yields two species of ornamented nautiloids, Cymatoceras neocomiense and Eucymatoceras plicatum. These have been collected together with other cephalopods (ammonoids, belemnites) and differen...
Volcanic rocks of the Zamoranos Formation exposed in the Betic Cordillera of southern Spain reveal Late Triassic CAMP volcanism extending from southwest to southeast of the Iberian massif. Comparison with volcanic rocks from the Upper Triassic of the Algarve region in Portugal enables correlation between these different magmatic provinces based on...
Geolodía Albacete 2020 presenta dos peñas emblemáticas de la localidad de Elche de la Sierra, centro neurálgico de la Sierra del Segura Albaceteña: La Peña de San Blas y la Peña del Agua. La primera es un lugar de interés geológico (LIG).Todo el recorrido se realiza por el Prebético Externo, que era el sector del margen ibérico más próximo a la cos...
Resumen Los alumnos con altas capacidades intelectuales constituyen un colectivo al que el sistema educativo debe prestar especial atención. Muchos de estos alumnos presentan a lo largo de su etapa educativa miedo al rechazo, frustración, fracaso escolar y falta de aceptación de su propia identidad, llegando incluso a ocultar sus capacidades.Trabaj...
During the greenhouse conditions prevailing in the early-middle Eocene, larger benthic foraminifers (LBF) spread out on carbonate platforms worldwide while rhodolith beds were scarcely represented. This reduction in rhodolith beds coincided with a relative decrease in coralline algal diversity and with a drastic decline of coral reef abundance. Mid...
Sauropterygian vertebrate remains from the Ladinian (Middle Triassic) of the proximity of Calasparra (Murcia, Spain) are described here. They represent the first documented Triassic vertebrate remains found in the Province of Murcia, and the first in the Subbetic domain of the Betic Cordillera (Southeastern Spain). These new remains consist of inco...
The Permian-Triassic rifting represents the first of the two
Mesozoic rifting stages recorded in the Iberian Peninsula.
Its first phases of development started during the Early
Permian, and were linked to the beginning of the break-up
of Pangea, the large, unique and rheologically unstable
supercontinent that mainly resulted from the collision of
G...
Libreto Geolodía Alicante 2019: Busot
Shallow-marine transgressive successions deposited in dominantly high-accommodation settings are considered to develop relatively thin and well-sorted deposits, but are rarely preserved in the stratigraphic record. Although a few examples have been described in subsurface and outcrop studies, existing models of transgressive sand development are st...
Libreto del Geolodía de Alicante 2018. Crevillente
Triassic brachiopods from the Betic Range were unknown hitherto. Herein we describe the first brachiopod occurrences in the early Ladinian of this domain referable to a new genus and species Misunithyris goyi derived from three localities of the south-Iberian Triassic outcrops. The analysis of internal and external characters of this brachiopod all...
Marine microfossils, specifically planktonic and benthic foraminifera, are a valuable tool to constrain the age (biostratigraphy) and water depth (paleobathymetry) of the sedimentary record in the Granada Basin. Using both data sources, our study has aimed to illustrate the history of the vertical movements in the tectonically uplifted sectors of t...
El volcanismo basáltico de la Formación Dumisseau en la Sierra de Bahoruco, SO de la República Dominicana: registro del magmatismo de pluma mantélica de la Provincia Ígnea Caribeña. Boletín Geológico y Minero, 128 (3): 541-568 RESUMEN La Fm Dumisseau aflorante en la Sierra de Bahoruco ofrece la oportunidad de estudiar en tierra el magma-tismo de pl...
The characterization of materials used in the construction of megalithic monuments can be considered a key aspect for a better understanding of the social behavior of past societies. The excavation of four dolmens and one small cist in 2015 at the megalithic necropolis of Panoria (Granada, Spain) offered an excellent opportunity to explore the geol...
The Dumisseau Fm outcropping in the Sierra de Bahoruco offers the opportunity for studying on land the mantle plume magmatism generator of the Caribbean large igneous province (CLIP) during the Late Cretaceous. It consists of a sequence of about 1.0-1.5 km-thick mainly composed of mafic basaltic flows and pyroclastic deposits, with subordinated vol...
The Guadalquivir Accretionary Complex forms a largely oblique prism at the northern edge of the Betic-Rif orogen, where Miocene sediments plus allochthonous evaporite-bearing units were accreted during the displacement of the Alborán Domain toward the west. Traditional interpretations end the tectonic structuring of the Betic Cordillera at the pres...
In this paper, we synthesize sedimentological, magnetostratigraphic and paleontological data from the continental vertebrate site of Puerto de la Cadena (Murcia, SE Spain), in order to clarify its age. The study site is located on the northern edge of the Carrascoy mountain range, in the upper part of the Cigarrón Unit. The end-Messinian discontinu...
In several places inside the Sierra Nevada range, marine Tortonianunits of the Granada Basin crop out. Our study is focused on the CerroSevilla (1425 metres of altitude) stratigraphic section. Foraminifers-basedbiostratigraphic and palaeobathymetric data reveal three main aspectsconcerning to the history of vertical movements in the area: i) the in...
RESUMEN En este trabajo se presenta una recopilación de las especies de ammonoideos conocidas en los materiales de facies Muschelkalk del Triásico Medio de las diferentes cuencas españolas, como la Cordillera Costero Catalana, la isla de Menorca, la Cordillera Ibérica, la Cordillera Bética y la isla de Mallorca. Se aportan también las observaciones...
Late Quaternary alluvial sedimentary units in the Guadiana Menor River valley, a tributary of the Guadalquivir River in southern Spain are described based on geomorphological mapping, sedimentological analysis, palaeosol development, and radiocarbon chronology. Four infill units in the valleys were differentiated with surfaces at + 45 (MU1), + 70 (...
The study of Middle Triassic (Ladinian) nautiloids from three successive ammonoid zones, and two sub-zones, of the Southiberian Triassic Muschelkalk facies (Betic Cordillera, southern Spain) has allowed the identification of the following species: Mojsvaroceras haasi Parnes, 198639.
Parnes, A. 1986. Middle Triassic cephalopods from the Negev (Israe...
The basaltic volcanism of the Dumisseau Fm in the Sierra de Bahoruco, SW Dominican Republic, offers the opportunity to study, on land, the volcanism of the Caribbean Large Igneous Province (CLIP). It consists of an at least 1.5 km-thick sequence of submarine basaltic flows and pyroclastic deposits, intruded by doleritic dykes and sills. Three geoch...
Director del taller “Ornamentación e improvisación en la música del Renacimiento y del Barroco”, (Universidad Internacional de Andalucía, campus “Antonio Mahado” de Baeza, del 2 al 4 de diciembre de 2015), junto con Fernando Pérez Valera (Universidad de Alicante).
This work describes for first time a new outcrop of lamproites located in Los Bañuelos, between the municipal territories of Férez and Socovos (Albacete), which represent the westernmost known in the region. The found rocks are mainly pyroclastic or freatomagmatic flows that are intercalated between lacustrine sediments of upper Miocene age. Normal...
The Cueva del Búho beneath the Cejo the Muela (Mula, Murcia) is a rock shelter with evidence of a relatively continuous occupation since, at least, the Upper Paleolithic to the end of Neolithic. This rock shelter shows the collapse of a slab of few meters thick limestone from the ceiling. The collapse sealed the archaeological record, which have th...
In this paper, the Collejares Fault System (SFC) is presented as responsible for most of the deformation, that from the middle Miocene to the present, occurs at the southern end of the Cazorla Arc. The existence of instrumental earthquakes and seismites levels in Quaternary sediments indicates their seismic character. The vertical slip rate since t...
The Socovos Fault shows a structure system associated with its development. The structure system accommodated an important part of the strain that has gone unnoticed until now. This system consists in small faults with a different strike to the Socovos Fault but related to the same stress context; folding that produce the uplift of Quaternary units...
Since October 2012 till now, more than 2200 low magnitude earthquakes have been located in the vicinity of the towns of Torreperogil and Sabiote (Jaén), in the easternmost part of Guadalquivir Basin, Spain, an area considered of low seismic hazard. Specific tectonic studies in the region are barely available due to the scarce deformation of Mesozoi...
A trip around Lietor (Albacete) that shows impressive petrified travertine falls and an enigmatic place called "Los Infiernos".
The Menga Dolmen in Antequera (Malaga province, Spain), measuring 27.5 m long and composed of 32 large stones, is recognized as possibly the largest megalithic burial monument of Prehistory. However,
until now, no studies of Menga have ever been internationally published. This article, while aiming to be
the first is also the first geoarchaeologica...
Sudden marine flooding within otherwise continental successions of the Triassic is unusual. The Tabular Cover of the SE paleomargin of the Iberian Massif is characterized by continental Triassic redbed facies composed of sandstones and siltstones, with gypsum-rich levels in the transition to Jurassic limestones. These Triassic deposits were develop...
Sulfate isotope compositions (δ34S and δ18O) and strontium isotope ratios (87Sr/86Sr) of Triassic
evaporites in the Betic Cordillera are addressed for the first time in the present work. Isotope values
have been determined in gypsum and anhydrite samples of the Germanic-type facies (Buntsandstein,
Muschelkalk and Keuper) coming from different outcr...
A seismic series occurred among Torreperogil and Sabiote towns (Jaén, Spain), with more than 2100 earthquakes located and more than 200 events felt. The series has alarmed the population and caused perplexity, because the area was considered little or no tectonically and seismically active. The hypocentres were located at the basement of the Guadal...
Lithospheric-scale tearing is commonly linked to the lateral termination of subduction rollback and slab segmentation. The upper-crustal expression of this process can be associated with the development of arcuate orogenic belts (oroclines) generated by a combination of vertical-axis block rotations and strike–slip faulting. However, the link betwe...
Se describen varios lugares de interés geológico en la península de Bahoruco, poniéndose en evidencia la elevada geodiversidad de esta región y la existencia de un valioso patrimonio natural que podría requerir protección y que, a su vez, es un recurso turístico, divulgativo y científico para el desarrollo de la zona.
Two stages of depositional high-discharge fluvial environments are recorded in the infilling of a rock shelter in a canyon of the Segura River, namely: (1) First stage: aggradational alluvial gravels in the lower part, interpreted as braided channel bars (Seventh millennium to 2030 cal BC), and (2) Second stage: slackwater flood deposits in the upp...
A field trip around Clasaparra (Murcia, Spain) showing the tectonic history of the Socovos fault and the associated vulcanism
We have selected three main wetland systems located in southern Spain to
describe the tectonic factors that have given rise to the formation of
closed depressions originating playa - lakes in a semi arid climate
context. The three wetlands are located in the provinces of
Córdoba, Seville and Cádiz (Andalusia). The
low-permeability of the materials...
Floods in the Almadenes Canyon (Segura River, southeast Spain) have been reconstructed using unsteady two-dimensional shallow water modelling. Slackwater deposits, archaeological age dating and hydraulic modelling allowed us to reconstruct some of the oldest extreme floods reported in Spain. The paleoreconstruction was performed for the first time...
In the Triassic of the Betic Cordillera, the U-shaped trace fossil Diplocraterion parallelum exhibits pronounced spatial variations in its abundance, size, and orientation. Higher density populations are found in small patches on bedding planes that were topographic lows on the palaeo-seafloor. These patches consist mainly of small specimens, separ...
The Cordillera Septentrional records the oblique subduction and collisional processes between the Caribbean and North American plates during Late Cretaceous to early Palaeogene times. The Puerto Plata basement complex of this range is considered to represent a fragment of the frontal part of the Great Arc of the Caribbean in Hispaniola that origina...
The virtually unfolded sedimentary cover of the Cordilleras Central and Oriental in the eastern Dominican Republic (eastern Hispaniola, tropical North Atlantic) largely consists of Pliocene to Early Pleistocene mixed siliciclastics and carbonates. These deposits have been grouped into two laterally interfingering mapping units, the Yanigua and Los...
We describe a Quaternary succession consisting of coastal and teuvestrial
facies which record sea level fluctuations in the Eastern coast of Bahoruco
peninsula (SW of Dominican Republic). The bottom of this sequence is
formed by coral limestone deposit interpreted as fringing reef with a most
likely age corresponding to the onset and progress of La...
Geolodía Albacete 2012. Socovos- La Abejuela. A field trip
The study of the Late Triassic Zamoranos Formation and the comparison to coeval carbonate units provides new insights into the evolution and palaeogeography of carbonate platforms during major rifting phases in the Earth's history. The platform carbonates of the Zamoranos Formation record the last major transgression during the Triassic, and docume...
This study focuses on storm deposits in the Muschelkalk facies of the Betic Cordillera (southern Spain) and interprets their deposition mechanisms. Three types of storm deposit are distinguished: (i) pot/gutter casts; (ii) tempestite beds; and (iii) storm‐winnowed deposits. Each deposit provides information about the carbonate platform environment...
The Collejares fault system is a group of faults, described for first time here, in the neighborhood of the mbLg 4.4WHuesa earthquake, occurred the 01/31/2012 at the eastern end of the Guadalquivir Basin. The faults have a N090-120ºE strike,with both dextral and reverse sense of shearing.The focal mechanism of the earthquake agrees with the kinemat...
