Archives


2019

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Vol 17

Cover caption: Iron oxidation of volcanic sediments from Croscat Volcano in La Garrotxa, Spain.

Author: Jordi Pedra Méndez.

2018

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Vol 16, No 4: Contributions to the geological evolution of the Iberian Peninsula: a tribute to Pere Santanach

Cover caption: DMT image (0.5m) of the La Serrata area (Carboneras fault, Almeria). LIDAR data obtained in the framework of the project SHAKE (CGL2011- 30005-C02-01).

Autor: R. López Escudero.

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Vol 16, No 3

Cover caption: Tinto River waters at it source with a pH of 3.5. The pH indicates different magnitudes of metals in solution (Huelva, Spain).

Author: Stefania Schamuells.

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Vol 16, No 2

Cover caption: Progressive unconformity of the Puig Cavaller, Catalonia (Spain). Oligocene conglomerates.


Author: Carolina Seguí.

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Vol 16, No 1

Cover caption: Sete Cidades caldera general view taken from South view showing the main lake, where other small volcanic calderas are intuited at the West of the largest caldera (left of the picture). Western part of Saõ Miguel island (Azores).


Author: Paula Senar Manero.


2017

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Vol 15, No 4: Granites and Related Rocks. A tribute to Guillermo Corretgé

Cover caption: Intrusive contact of a sillimanite-bearing granite (nebulite) crosscutting a previously deformed porphyritic monzogranite. These relations show a sequence of intrusion, deformation, melting and new intrusion of granitic magmas that illustrate the complex history of formation of the large granite batholiths in the middle of the continental crust. From the Glacial Cirque of Gredos, Avila batholith, Spain.

Author: Antonio Castro.

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Vol 15, No 3

Cover caption: Outcrop of the Ladrilleros-Juanchaco Sedimentary Sequence (LJSS) in the Pacific Coast of Colombia. Sandstone and mudstone intercalated strata gently dipping to the south. The ground is covered by sand due to coastal dynamics. Photograph taken from a topographic high on top of the LJSS looking to the southeast.

Author: Raúl A. Trejos-Tamayo.

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Vol 15, No 2

Cover caption: Jurassic lacustrine sediment including coal layers and deformed by the northern Tien-Shan tectonism. Southern shore of Lake Issyk-Kul (Kyrgyzstan). The mining town of Kadji-Sai is in the background. 

Authors: Angela Landgraf and Daniel Garcia-Castellanos.

Field guide: Prof. Abdrakhmatov Kanatbek.

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Vol 15, No 1

Cover caption: Nevado de Colima rises to an altitude of 4260m in the background. Constant degassing coming out from the summit crater of Volcán de Colima, Mexico.

Author: Josep Cabré-Brullas.


2016

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Vol 14, No 4

Cover caption: The Mangue de Pedras (B˙zios, RJ, Brazil) is one of the only three known examples of Rock Mangrove in the world. Their peculiarity is the absence of mud and rivers, freshwater flowing to the seashore underground after infiltration in the surrounding relieves. Its fresh to brackish water flora and fauna are characteristics and protected.

Author: R. Baudino (2014), during the XIV ALAGO (Latin American Association of Organic Geochemistry) conference fieldtrip.

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Vol 14, No 3

Cover caption: “The garnet” Garnet (grossular-andradite) with epidote. 5 cm. Cala mine (Huelva, Spain).

Author: Stefania Schamuells Panesso.

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Vol 14, No 2

Cover caption: Truchas syncline volcanic rocks, Truchillas, León, Spain.

Author: Javier Fernández Lozano.

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Vol 14, No 1

Cover caption: Quaternary, oriented shell deposition non consolidated formation, Seltjarnarnes beach, Iceland.

Author: Emma García Boades.


2015

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Vol 13, No 4

Cover caption: Devonian sandstones in the Tadrart region, west of Djanet, Sahara.

Author: T. Ferreiro.

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Vol 13, No 3

Cover caption: Negro Hill (Livingston Island, Antarctica) is subvolcanic body composed by subalkaline basalts with conspicuous columnar jointing. 

Author: Claudio A. Parica.

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Vol 13, No 2: Selected contributions from the 7th Iberian Conference on Coastal Geomorphology (JGEOLIT2013), Oviedo (Spain)

Cover caption: Mixed beach of gravels and sands of Cobijero (eastern coast of Llanes, Asturias, NW Spain), developed over a calcareous sinkhole, leading into the cliff through a crack (at the end).

Author: G. Flor.

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Vol 13, No 1

Cover caption: Piedras Blancas glacier and moraine deposits in the eastern slope of the Fitz Roy (or Chaltèn) massif. El Chaltèn, Patagonia.

Author: Josep María Casas.


2014

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Vol 12, No 4: ALAGO Special Publication: Selected Contributions from the XIII Congress

Cover caption: Exhumed Maastrichtian sandstone reservoir near Loza, Basque- Cantabrian Basin, NE Spain. Hydrocarbons exude and flow during summer when the temperature is relatively high (for scale, the coin is 2cm in diameter).

Author: A. Permanyer. In the paper by Marín et al. this issue.

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Vol 12, No 3

Cover caption: Tortonian marine sediments of the Guadix Basin (Dehesas de Guadix, Granada).

Author: Miguel Garcés.

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Vol 12, No 2

Cover caption: Devonian sandstones in the Tadrart region, west of Djanet. Sahara.

Author: T. Ferreiro.

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Vol 12, No 1

Cover caption: Kekuphyllum sandoense sp. nv. Offsets in adanced growth stage. 

Author: J. Fedorowski et al.


2013

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Vol 11, No 4

Cover caption: Non-marine primary gypsum exposure at the southern bank of the concentration pond 3 of EMISAL Co., Fayioum, Egypt.

Author: Prof. Mohamed W. Ali-Bik.

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Vol 11, No 3

Cover caption: Holotype of Schlueterimyia cenomanica, a genus of diptera described in Sarthe amber.

Author: André Nel (Musem National d’Histoire Naturelle, Paris).

 

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Vol 11, No 2

Cover caption: Nummulitic limestone from the Eocene Ainsa Basin (South Central Pyrenees).

Author: Miguel López-Blanco.

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Vol 11, No 1

Cover caption: A stack of imbricate thrust sheets with hanging wall anticlines. Aragüés valley, southern Pyrenees, Huesca.

Author: María Luisa Arboleya.


2012

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Vol 10, No 4

Cover caption: Western coast of Half Moon Island-South Shtlands-Antarctica. It shows: volcanic necks, the granodiorites and andesites (into the island), and the paleobeaches (4 levels).

Author: Claudio Parica.

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Vol 10, No 3

Cover caption: Huge oncoid body in connection with the K/T boundary. Tremp Formation, Àger syncline (South Central Pyrenees).

Author: Humberto Astibia.

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Vol 10, No 2

Cover caption: Outcrop photograph illustrating two folded pseudotachylyte veins injected in the contact granite mylonite-gneiss at the Azul megashear zone, Río de la Plata craton, Argentina.

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Vol 10, No 1

Cover caption: Alephis tigneresi in anatomical connection from the Camp dels Ninots maar site (NE Spain).

Author: Gerard Campeny (IPHES).


2011

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Vol 9, No 3-4: Subduction Zones of the Caribbean: The sedimentary, magmatic, metamorphic and ore-deposit records (UNESCO/IUGS IGCP)

Cover caption: View of the landscape and tropical vegetation of the Purial mountains, eastern Cuba, taken from the La Farola road. The region is made of metamorphosed Cretaceous volcanic arc rocks of the Purial Complex, overridden by the Moa-Baracoa ophiolitic body.

Author: Antonio García Casco.

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Vol 9, No 2

Cover caption: Mass-transport deposits in the Lower Cretaceous turbidite successions near Matxitxako Cape, Basque Pyrenees, Spain.

Author: A. Amilibia.

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Vol 9, No 1

Cover caption: Volcanic formations, mainly made of ignimbrites and basalts, in the valley of Uçhisar (Cappadocia, Turkey). The differential erosion of these materials results in the formation of very characteristic landforms, such as these hoodoos or fairy chimneys. 

Author: Aitor Calvo Martinez de Guereñu.


2010

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Vol 8, No 4: The Late Palaeozoic of western Gondwana: new contributions from southern South America

Cover caption: Upper Palaeozoic red beds at Cuesta de Miranda, Paganzo Basin, northwestern Argentina.

Author: Luis Spalletti.

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Vol 8, No 3

Cover caption: Panoramic view of the Aguasalio synclinal (Crémenes, León province, Spain), showing the Devonian - Lower Carboniferous preorogenic succession of the Esla region (Cantabrian Zone).

Author: Xavier Delclòs.

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Vol 8, No 2

Cover caption: Triglav (Slovenia) observed during descent on August 2006.

Author: Laura Rincón

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Vol 8, No 1: Electromagnetic Induction in the Earth

Cover caption: Aurora Borealis observed from Lake Kleifarvatn (Iceland) during a full moon with clear skies. January 2007.

Author: Georg Vilhjálmsson.


2009

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Vol 7, No 4

Cover caption: Thrust-related folds involving Devonian limestones (white) and Carboniferous limestones (gray, left) in the Correcillas Thrust Sheet. Notice that most folds are detached along the Devonian-Carboniferous contact. Southeastern slope of the Correcillas Peak (Cantabrian Zone, NW Spain).

Author: Juan Luis Alonso.

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Vol 7, No 3

Cover caption: In the background, purple-blue Lower Cretaceous amber of El Soplao (Cantabria, Spain) and, in the foreground, a small wasp (Insecta: Hymenoptera) found in this amber. Wasp wing length: 3.4 mm.

Author: X. Delclòs.

Composition: R. Pérez de la Fuente.

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Vol 7, No 1-2: Climate and Biota of the Early Paleogene: Recent advances and new perspectives

Cover caption: Middle part of the Zumaia section (Guipúzcoa, Basque Country), which contains the Global Stratotype Section and Point for both the Selandian and Thanetian Paleocene Stages.

Author: J.I. Baceta.


2008

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Vol 6, No 4

Cover caption: Fitz Roy (or Chaltén) peak made up by Miocene granite intruding Cretaceous pelites. Patagonia.

Author: Jospe María Casas.

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Vol 6, No 3

Cover caption: "The Organ Pipes", post Karro dolerite dykes (Lower Cretaceous), associated with the opening of the South Atlantic. Twylfelfontein - Burnt Mountain, Namibia.

Author: X. Delclòs.

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Vol 6, No 2: Lower Paleozoic Biostratigraphy of South Africa: New contributions and advances

Cover caption: Westward view in the foreground of the upper Sierra de la Invernada Formation outcrops (Mid-Late Ordovician; La Invernada Range foothills). In the background El Tigre Range (Western Precordillera, San Juan Province, Argentina) is seen.

Author: G. L. Albanesi. 

See Ortega et al. in this issue.

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Vol 6, No 1: GEOSUR 2004: Mesozoic to Quarternary evolution of Tierra del Fuego and neighbouring austral regions II

Cover caption: Folds related to Late Cretaceous Fuegian Andes compressional events - Bahia Ensenada, West of Ushuaia, Lemaire Formation.

Author: M. Menichetti.


2007

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Vol 5, No 4: GEOSUR 2004: Mesozoic to Quarternary evolution of Tierra del Fuego and neighbouring austral regions I

Cover caption: The glacial valley of Laguna Esmeralda with the Albino and Domo Blanco glaciers (Sierra Alvear in Isla Grande de Tierra del Fuego). The Upper Jurassic Lemaire Fm rhyolites in the foreground are thrusted over the Lower Cretaceous Yahgán Fm black mudstones, which crop out in the surrounding peaks (altitude about 1,400 m above sea level).

Author: M. Menichetti.

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Vol 5, No 3

Cover caption: Devonian sandstones in the Tadrat region, West of Djanet, Sahara.

Author: T. Ferreiro.

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Vol 5, No 2

Cover caption: Stratification and cleavage in the St. Vito Formation sandstones (Middle Cambrian-Lower Ordovician). Arburese, Sardinia, North-Western Mediterranean.

Author: Josep Maria Casas.

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Vol 5, No 1: Dedicated to Francesc Calvet (II)

Cover caption: The Corones Fm (Lower Eocene) outcropping in the Gaudi Artigas Gardens. La Pobla de Lillet, (South-eastern Pyrenees, Catalonia, Spain).

Author: A. Permanyer.


2006

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Vol 4, No 4

Cover caption: Round notch in a leaf edge produced by leafcutter bees (left), and Agromyzidae (Diptera) mines in a leaf (right). Both are widespread examples of insect-plant interaction.

Author: X. Delclós.

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Vol 4, No 3

Cover caption: Left: Idiomorphic dolomite crystals brotrioidal sphalerite (upper margin 4.2 mm wide). Right: Close up of
one of the replacing dolomite crystals at the up left corner (lower margin 2.8 mm wide), Galmoy ore, Ireland.

See paper by Merino et al. in this issue.


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Geologica Acta (ISSN-1695-6133)
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