[en] This work is about The Caolines program. After several stages was designed a network of drilling to be developed in prospective areas. The support of this network was a geological cartography performed in a devonian region.

[en] This work is about Cretacic tectonics in Uruguay, this formation is characterized by high level cortex because the basament is cratonized since Middle Devonian. There were formed two main grabens such as Santa Lucia and Mirim-Pelotas which are filled with basalt and sediments.

[en] This work is about the results and conclusions of the populations palinomorphs study, carried out in Devonian formations in the center of Uruguay. The existence of a regressive transgressive cycle is verified by analyzing the vertical distribution of palinomorphs as well as is mentioned the presence of chintziest for the section studied - hoesphaeridium Cyathochitina kinds

[en] Complete text of publication follows. We have studied horizontally elongated dark-red, hard lens-like interlayers in the unconsolidated Middle Devonian sandstone in the Kooskora quarry, SE Estonia. The previous mineralogical study by Shogenova et al. (2009) assumed that these unique iron-rich concretionary bodies are of diagenetic origin due to mobilization of iron by groundwater in the host sandstones. It was supposed that the diagenesis was associated with Caledonian tectonism at the end of Middle Devonian. To test the validity of this estimation, we have performed new paleomagnetic, rock magnetic and mineralogical (X-ray, SEM) studies of the formation. Our mineralogical studies show that the pore space of the primary sand-composing minerals (quartz, muscovite, K-feldspar, rutile) is almost fully filled with fine-grained matrix composed of secondary hematite, goethite and clay minerals which hint for oxidizing environment during cement formation. Two high coercivity and high unblocking temperature hematite-carried magnetizations were identified after thermal and alternating field demagnetization of altogether 41 samples. The components represent dual polarity (D = 2.8 deg; I = 71.0 deg; k = 67.3; α₉₅ = 4.1 deg and D 142.0 deg; I -71.9 deg; k = 145.0; α₉₅ = 3.2 deg) but do not pass the reversal test. The virtual poles from these directions are close to the present Earth's magnetic field, but the dual polarity and the carrier of remanence (hematite) make the viscous origin unlikely. Paleomagnetic data suggest that these concretions may be (i) diagenetic, whereby the primary iron mineral altered to hematite in late Cenozoic or (ii) secondary late Cenozoic formations, resulting from processes associated with neotectonic movements.

[en] This work is about the preliminary biostratigraphic upper palezoic era in Uruguay as well as the devonian, carboniferous and permian period.

[en] This article carried out the assistance research project implementation in devonian sedimentary units as a potentials aquifers and their best use to school supplying and rural population in central area of Uruguay.

[en] The Earn Group of central Yukon records the transition from a passive to an active margin along western Laurentia in the Late Devonian. Fine-grained clastic rocks and chert of the lower Earn Group contain late Early to Middle Devonian fossils and were deposited in an offshelf environment. The upper Earn Group comprises a mixture of sandstone and conglomerate, fine-grained siliciclastic rocks, and widespread crystal lithic tuff. Zircons from this succession are precisely dated using chemical abrasion isotope dilution thermal ionization mass spectrometry (CA–ID–TIMS) methods on igneous (ca. 363 Ma) and detrital (ca. 378–363 Ma) grains and the ages were confirmed by Frasnian to Famennian fossils. Abrupt, along-strike facies changes within the upper Earn Group of the Glenlyon–Tay River area occur across mapped faults that are inferred to have originated as syndepositional extension faults in the Late Devonian. Occurrences of ca. 363 Ma tuff horizons within all facies of the upper Earn Group provide a temporal correlation across the area. Diorite plutons intrude lower Paleozoic rocks in the area and have U–Pb zircon crystallization dates of ca. 364 Ma. The diorite has calc-alkaline composition consistent with arc magmatism or crustal contamination. The Late Devonian magmatism in the Earn Group is coincident with onset of arc magmatism in the allochthonous Yukon–Tanana terrane, and extension related to rifting and opening of the Slide Mountain ocean in a back-arc setting. Magmatic rocks in the Earn Group of central Yukon thus represent part of a remnant continental arc and back-arc stranded behind the Slide Mountain ocean in the Mississippian. (author)

[en] This work is a proposal to implement a project with external assistance to investigate potential Devonian sedimentary aquifers to supply towns in central Uruguay

[en] Petalichthyid and “acanthothoracid” placoderms have taken pivotal positions in the debate on placoderm — and, by extension, jawed vertebrate — relationships owing to perceived similarities with certain jawless vertebrates. Neurocranial characters are integral to current hypotheses of early gnathostome relationships. Here, we describe the three-dimensionally preserved neurocranial anatomy of the petalichthyid placoderm Ellopetalichthys scheii (Kiær, 1915), from the Middle Devonian (early Eifelian) of Ellesmere Island, Canada. Using X-ray computed microtomography, we generated three-dimensional reconstructions of the endocranial surfaces, orbital walls, and cranial endocavity. These reconstructions verify the absence of a crus commune of the skeletal labyrinth and the complex shape of the petalichthyid endolympathic duct. Details of the craniothoracic joint and occipital musculature fossae help resolve the problematic comparative anatomy of the occipital surface of petalichthyids. These new data highlight similarities with arthrodire placoderms, consistent with older hypotheses of a sister-group relationship between petalichthyids and that clade. (author)

[en] This work is about the geological map of Uruguay Esc.1.100.000 (Melo) and the explanatory memoranda which describes the geological , lithological and sedimentological characteristics soils belong to the pre devonian period in Melo, Buena Vista Yaguari and Tres islas formations. These metamorphic rocks would be compared with the orogenic cycle of the east and southeast groups